Camera
Field review: Panasonic Lumix G 25mm F1.7 ASPH – compact, affordable and capable

Introduction
The Panasonic Lumix G 25mm F1.7 ASPH is a compact and lightweight prime lens for Micro Four Thirds camera bodies. It offers an equivalent focal length of 50mm in full-frame terms, and an equivalent maximum aperture of F3.4. This lens is a great choice for general-purpose photography, including low-light work.
At $250 USD and available now, the Lumix G 25mm F1.7 is a solid option whether you’re looking for a companion to your ‘kit’ zoom lens or you just want something small and fast to shoot with.
Key specifications:
- Focal length: 25mm (50mm Full-Frame equivalent)
- Aperture range: F1.7 – 22
- Stabilization: None built-in
- Filter thread: 46mm
- Close focus: 0.25 m (9.84″)
- Maximum magnification: 0.14x
- Diaphragm blades: seven
- Hood: yes (plastic, included)
- Weight: 125 g (0.28 lb)
- Optical construction: 8 elements in 7 groups
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ISO 200 | 1/800 sec | F4 | Panasonic Lumix DC-G9 |
Ah, the nifty fifty. Back in the film camera days, long before the advent of the zooming kit lens, camera companies often shipped their consumer and enthusiast bodies kitted with a 50mm lens; a practice I’d be thrilled to see come back. After all, they say you become a better photographer, faster, ‘zooming’ with your feet rather than zooming with your lens. Why? Because moving around forces creativity and often opens up new perspectives!
Anyhow, the hallmark of any good nifty fifty, then and now, is a favorable ratio of quality to price. And Panasonic’s modern take for Micro Four Thirds fits the bill nicely: though it’s very affordable, it’s capable of producing lovely images.
Follow along as we jump into handling, AF behavior, and optical characteristics to find out if this lens is also a good choice for you.
Sample images in this review were edited in Adobe Camera Raw with adjustments limited to white balance and exposure parameters. Sharpening and noise reduction were left at ACR defaults.
Handling
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At 125g (4.4 oz) in weight and just 52mm (2 in) in length, this 25mm F1.7 is among Panasonic’s smallest and lightest prime lenses. The mount is metal while the body is constructed of plastic. Despite the delightfully lightweight design, it looks and feels well-built.
As one should expect at the price point, this 25mm offers a bare-bones feature-set. There’s no optical stabilization, though this shouldn’t matter for the vast majority of shooters, as almost all modern Micro Four Thirds bodies have internal IS. Nor is there an aperture ring or custom buttons. What the lens does offer is a sizable focus ring.
The front accepts 46mm filters and a plastic lens hood, H-H025, is included in the box. The hood attaches bayonet style, so it can be used with a filter. It can also be attached backward, to save space.
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Compared to…
Olympus also makes a ‘nifty fifty’ similar to this one. It’s a little more expensive, but it’s also a bit more compact. Other options in this segment include the faster, though longer Sigma 30mm F1.4 and the higher-end Panasonic/Leica 25mm F1.4 II.
Here’s how they all stack up:
Panasonic Lumix G 25mm F1.7 | Olympus M.Zuiko 25mm F1.8 | Sigma 30mm F1.4 DC DN | Panasonic Leica DG 25mm F1.4 II | |
---|---|---|---|---|
Street price | $250 | $290 | $290 | $700 |
Optical construction | 8 elements in 7 groups | 9 elements in 7 groups | 9 elements in 7 groups | 9 elements in 7 groups |
Aperture range | F1.7 – F22 | F1.8 – F22 | F1.4. – F16 | F1.4 – F16 |
Focus motor | Stepping motor | Stepping motor | Stepping motor | Stepping motor |
Weather sealed | No | No | No | Yes |
Diaphragm blades | 7 | 7 | 9 | 7 |
Filter thread | 47mm | 46mm | 52mm | 46mm |
Minimum focus distance | 0.25 m (9.84″) | 0.24 m (9.45″) | 0.30 m (11.81″) | 0.30 m (11.81″) |
Diameter / length | 61mm / 52mm | 56mm / 41mm | 65mm / 73mm | 63mm / 55mm |
Weight | 120 g | 136 g | 265 g | 205 g |
Autofocus and focus breathing
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The Panasonic 25mm F1.7 is plenty fast to focus on a Lumix body; and shooting in AF-S tends to lead to faster AF acquisition than using AF-C. The lens is also snappy to focus with Olympus bodies, though given how close in price the Olympus 25mm F1.8 is to this lens, we’d recommend sticking with the native option for best AF performance.
The minimum focus distance of 0.25m or just shy of 10 inches is solid. Users will be able to get fairly up-close and personal with their subjects. And focusing is internal, meaning the lens does not increase in size as it racks.
For video shooters, focus breathing – where the framing shifts as the focus is pulled – is fairly well controlled. This is good news for folks who may want to manually rack focus for a cinematic effect. The manual focus action is a focus-by-wire affair and responsive enough; the ring itself turns with no hard stop at either end of the focus range.
The lens is also impressively quiet when using AF in video mode thanks to its stepper motor. We tested it with a Panasonic G9 and found the touchscreen makes it painless to move focus smoothly and silently, with just the tap of a finger.
Image quality
Sharpness
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ISO 200 | 1/4000 sec | F1.7 | Panasonic Lumix G9 |
This Panasonic 25mm F1.7 is fairly sharp across the focal plane, wide open. And even on the highest resolution 20MP Four Thirds sensors, its resolving power should leave most users satisfied.
That being said, stopping down just a bit to F2 or F2.8 will result in the sharpest output. But sharpness will drop quite visibly by even F5.6 and certainly by F8, due to diffraction (remembering that F5.6 – F8 on Four Thirds is F11 – F22 in full-frame terms). So it’s better to crank your shutter speed in bright light, rather than go beyond those apertures, if possible.
Vignetting and distortion
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This lens displays minimal vignetting wide open. And any noticeable vignetting is gone by F2.8.
ISO 200 | 1/1250 sec | F2.8 | Panasonic Lumix G9 |
While the lens has a fair degree of barrel distortion in its optical design (which is to be expected, as the M43 system prioritizes compact size), distortion is fully corrected for, digitally, in the camera’s JPEGs and/or in your Raw converter. This means straight lines will look, well, straight (see the images above the flowers for an example). The lens also shows minimal vignetting wide open and any traces of vignetting are gone by F2.8.
If the tiny bit of vignetting does bother you, it can easily be corrected for in post. I personally enjoy it, though, as a matter of taste. But to each their own!
Bokeh
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ISO 200 | 1/2000 sec | F1.7 | Panasonic Lumix G9 |
The bokeh – or quality of the out-of-focus regions produced by this 25mm – is fairly pleasing. Panasonic takes pride in the smoothness/polishing of its aspherical surfaces/molds, and it shows here. The discs rendered by out-of-focus highlights are relatively Gaussian and free of distracting patterns like ‘onion rings’. Only occasionally do they show the slightest hint of a hard edge (more noticeable as you stop down), but not enough to cause any concern.
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At F1.7, bokeh near the edge of the frame displays a ‘cat eye’ effect. | At F4, bokeh looks much more uniform, in terms of its shape. |
However, when shooting wide open, bokeh near the edge of the frame looks lopsided, displaying the classic ‘cat eye’ effect. While this can lead to a slightly less shallow DOF effect at edges, it’s perfectly acceptable for a lens of this type, and wasn’t severe enough to yield swirly bokeh in our shots. More importantly, the discs near the corners aren’t truncated in an odd or distracting manner.
The ‘cats-eye’ bokeh is mostly gone by F4. However, bokeh discs becomes less rounded. Specifically, the polygonal shape of the lens’s 7-blade aperture becomes more pronounced in the out-of-focus highlights, when you stop down past F2.8, and this can have a slightly negative impact on bokeh in general.
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The Panasonic 25mm F1.7 is capable of producing images with good subject separation from the background.
ISO 200 | 1/3200 sec | F2.2 | Panasonic Lumix G9 |
Flaring, ghosting, and sunstars
Even when shooting with the included lens hood attached, artifacts from lens flare can be pretty distracting with this lens. You may notice ghosting when shooting directly into the sun, usually manifesting as a multiple-color haze or purple blobs.
When shooting bright light sources at stopped-down apertures – like in the F16 shot above – the ‘spikes’ of the sunstar are soft-edged and not all that well pronounced.
Lateral and longitudinal chromatic aberration (fringing)
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The out-of-focus regions in this F1.7 shot show some purple fringing in front of the subject, aka longitudinal CA (LoCA)
ISO 200 | 1/3200 sec | F1.7 | Panasonic Lumix G9 |
Lateral chromatic aberration – or purple/green fringing near the edge of the frame in high contrast regions – is very well controlled for optically, and is further corrected for digitally in JPEGs and/or in your Raw converter. Here are uncorrected and corrected Raw conversions – as you can see the differences are minor.
Longitudinal CA (LoCA) – or purple and green fringing manifesting in front of and behind the plane of focus – can be fairly noticeable wide open and is hard to manually correct for. That said, stopping down the lens just a bit helps to mitigate it, and although it doesn’t entirely disappear even by F2.8, it’s not too distracting either.
Conclusion
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What we like | What we don’t like |
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The Pansonic Lumix G 25mm F1.7 ASPH is an affordable and capable option for Four-Thirds shooters seeking something more versatile than the kit lens, especially for low-light photography. It’s well-built, compact, and fast/quiet to focus, making it a good choice for stills and video shooters alike.
Of course, for a little more money, you can get Sigma’s slightly faster 30mm F1.4 DC DN lens, which is also a strong optical performer. But the trade-off is a tighter crop (60mm in Full-frame terms) and a lens construction that’s quite a bit longer and about twice as heavy as the Panasonic.
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ISO 200 | 1/800 sec | F5.6 | Panasonic Lumix G9 |
For folks desiring the absolute best 50mm equiv. output for Panasonic Micro Four Thirds cameras, the Panasonic Leica DG 25mm F1.4 II is the ticket. However, at nearly three times the cost of the Panasonic 25mm F1.7, it’s not the easiest lens to justify. It’s even harder to justify given how solidly this more affordable prime performs.
Ultimately, though it’s not optically perfect, for most folks, the Panasonic Lumix G 25mm F1.7 ASPH is going to be more than good enough.
Camera
Tips for taking epic shots of tonight’s ‘blood moon’ total lunar eclipse

A lunar eclipse, captured by Jamie Malcolm-Brown in November 2021. Used with permission. |
Editor’s note: This article was originally published in 2022. We have updated it with information about the current eclipse as a service to readers.
Starting tonight, March 13, through the early hours of tomorrow, March 14th, skywatchers in the Americas will be able to view the first total lunar eclipse of the year. The moon will turn a ‘blood red’ hue for a brief period as it passes entirely into the Earth’s shadow when lined up with the sun. Depending on where you are located, there is a specific time you can witness this phenomenon.
Time and Date, a top-ranking site for times and timezones, created a useful tool that allows you to make a plan by entering your viewing location. From there, it gives you pertinent information, including the total duration, what time each phase of the eclipse starts and the direction it’ll travel, plus altitude during these phases. A helpful animation gives you a visual of how it will appear, minute by minute, once it starts.
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Time and Date created a free tool to help you plan your total lunar eclipse viewing, depending on your location. This is the data for Seattle, WA, where DPReview’s headquarters is located. |
If you plan on bringing your camera out for the ‘blood moon’, photographer Jamie Malcolm-Brown has some helpful tips for camera settings. Describing his process for capturing a lunar eclipse in 2021, he tells DPReview that ‘it was taken with [a] 200-600mm lens at 600mm, ISO 800, F6.3, at 1/3 sec. I bracketed the shots at 5 shots with an EV (exposure value) change of 1. Next time I would probably bracket 5 shots but with only an EV change of .3. The final image was cropped fairly significantly to fill the frame with the moon.’
While useful for capturing more detail on the moon’s surface, you don’t necessarily need a long lens that extends to 600mm to photograph the blood moon. John Weatherby released a quick, helpful tutorial on Instagram outlining his process for getting the best images possible. For one, you can shoot at a focal length between 100–200mm if you want to include a foreground.
View this post on Instagram
Weatherby also explains that having a sturdy tripod and ball head is an absolute necessity. Ensuring that the lens is locked in securely will yield clearer images of the moon. Using the camera’s shutter delay or self-timer, or an external remote, will also help prevent blurry shots as the camera is likely to shake a bit once you press the shutter. PhotoPills, an app that helps you identify where the moon will travel in accordance with your specific location, is recommended as well.
It’s important to check the weather in your area as cloud coverage can potentially conceal the moon completely. Windy.com is a free app available on desktop, iOS and Android that, in my opinion, does a decent job of forecasting weather patterns. It’ll give you a visual of where clouds will appear at specific dates and times so you can determine the best place to set up in your state or country.
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Windy.com, a free app, is an effective tool for forecasting weather elements, including cloud coverage. |
The next total lunar eclipse will take place on September 7, and will be visible in parts of Asia, Africa and Australia. If skywatching interests you, you’re in or near one of the locations where the eclipse is visible and weather permits, I recommend getting out for a few hours and witnessing this wonderful event first-hand.
Camera
Fast and fun: Photographer captures the thrill of Formula 1 with Lego

Photo: Benedek Lampert |
This weekend marks the start of the 2025 Formula 1 season, and one photographer is kicking things off with a series of photographs to celebrate. With a fine focus on detail and many hours of work, toy photographer Benedek Lampert has recreated F1 moments using Lego. This project is just the latest for Lampert, who has previously created life-like scenes of Lego versions of the Eiffel Tower and Shackleton’s Endurance.
In September 2024, Lego and F1 announced a partnership that included releasing numerous F1 Lego sets, some of which featured more realistic-looking models of F1 team cars. Lampert managed to get his hands on the entire starting grid and set to work on creating highly detailed, life-like photographs of the Lego F1 cars.
As with all of Lampert’s work, nearly everything was done in camera. “It’s extremely important to me that these are actual photos and not AI-generated graphics,” he explained. That meant lots of hands-on time to build sets and problem-solve special effects. He built the track scenery and crafted unique sets that allowed him to get motion blur, spinning wheels, smoke and water vapor without any editing work. Lampert explained that the only thing he added while editing was the cloud texture in the sky and rear lights in one image.
All said and done, Lampert says the project took 70 hours for the 10 final images. The photo shoot portion of the project took five days, with ten to twelve-hour days at times. You can see how he meticulously created each image in the behind-the-scenes video below, as well as the photos in the gallery above.
Camera
Inspiringly simple: Sigma BF review-in-progress

The Sigma BF is a minimalist 24MP full-frame mirrorless camera that offers distinctive design and an unconventional user interface.
Key specifications
- 24MP full-frame CMOS sensor
- Phase detection AF with human and animal detection
- No mechanical shutter
- 3.2″ 2.1M dot rear touchscreen
- Pressure-sensitive buttons with haptic feedback
- 6K video up to 30p, 4K up to 30p
- 1080 up to 120p
- Leica L-Log profile
- Zebras and False Color exposure displays
- 230GB of internal memory
- 10Gbps USB-C port, external mic compatible
The Sigma BF is available in Black or Silver at a cost of $2000. Sigma has also made versions of all its i-series primes to match the silver version of the camera.
Index:
What is it?
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The Sigma BF is explicitly not trying to be a do-everything, Swiss Army Knife of a camera. Sony’s a7C II already exists, bringing an EVF, multiple dials, a mechanical second-curtain shutter mechanism and in-body image stabilization, for a list price just 10% higher than the BF’s.
But if Sigma was trying to go head-to-head with Sony in the mass market, it probably wouldn’t be spending seven hours milling each camera out of blocks of aluminium, nor doing so in Japan: neither of which is the approach you take if you’re primarily driven to hit a specific price point.
Similarly, just looking at the specs, the BF might be mistaken for an unstabilized Panasonic S9 in a fancier body, but despite sharing a sensor, the two cameras couldn’t be more different.
Instead Sigma explicitly says the BF is designed for ‘everyday’ photography. An elegant object designed to be carried with you, rather than a utilitarian device you take when you’re taking photos. It’s absolutely not optimized for rapid operation, it’s not teeming with clever features. Instead it includes only the bare essentials for photography (or, arguably, slightly less than that, given its lack of mechanical shutter).
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Think of it like a Moleskine notebook: in many respects it’s not as practical for taking notes and recording ideas as the smartphone you’re already carrying, but the very process of carrying it with you acts as a prompt to look at the world and capture the thoughts you were having. The BF is trying to do the same.
It’s the difference between a camera that you’d grab when you want to go and take photos of something, vs a tool that encourages you to look for things to photograph.
Body and controls
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User interface
The best way to understand the BF is to note the dedicated settings display towards the top right-hand corner on the back of the camera. This displays one of ten parameters:
Drive mode | File format | Aspect ratio | Focus mode | White balance |
Shutter speed | Aperture value | Exp comp. | ISO | Color mode |
These are also the ten parameters that appear on the main screen if you press the center button on the back of the camera, in the pattern shown in the table above.
You can navigate between them by pressing the cardinal points on the rear dial, then scroll the dial to change the current setting.
But you don’t have to press the center button and bring them up on the main screen: once you’ve learned their relative positions (and chances are it’s the ones in the bottom row you’ll change regularly), you can navigate around them just using the settings display. And, for me, that’s the key to understanding the BF: it’s designed so that the core settings can be adjusted without looking at the main screen. You can set the camera to show all the settings on the main screen,
In keeping with this idea, the touchscreen is almost solely used for positioning the AF point or selecting a subject to track: even if you summon-up the settings on the main screen, you can’t tap to change settings, just choose what to focus on.
Exposure modes
The BF has no mode dial, so exposure mode is set by selecting which parameters you want to be controlled by the camera. This is done via the main screen. Press the center button to bring up the settings then press it again to edit them, and the ISO, aperture value and shutter speed indicators show ‘Auto’ options above them, letting you engage and disengage automated control of each parameter.
Any of the exposure parameters that can’t be changed by spinning the dial, either because they’re set to Auto or because aperture value is being set by an aperture ring, is rendered in darker grey, both in the settings display and on the main screen display.
Other settings
Another ten settings, six of which relate to how much detail appears on the main screen (exposure parameters, guides, virtual horizon, etc), can be accessed by pressing the ‘three dots’ settings button. At the bottom of this settings menu is the word ‘System’ which gives you access to a ten-option-long list of fundamental camera settings, including firmware information, copyright information, menu language and date/time.
That’s the extent of the BF’s interface: ten top-level parameters, ten settings and ten menu options. But what this doesn’t fully convey is the degree to which it’s a camera in which Shutter speed, Aperture value, Exposure compensation and ISO can all be set using just the settings display, leaving the monitor solely for focus and composition.
Handling
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The BF is a very solid-feeling camera, as you might expect from something hewn from a solid block of metal. The body itself is relatively light but the weight adds up as soon as you mount a lens of any appreciable size on it.
Despite it’s minimalist appearance, it’s quite easy to hold. The textured front-plate and raised thumb rest at the back mean you can get a pretty solid grip on the camera, and you can cradle the weight of the lens in your left hand if you’re working with anything larger than one of the compact primes offered by Sigma or Panasonic.
However, we found that it was common for our ring finger to wrap around to the base of the camera as we held it, which quickly makes apparent how sharply angled the edge of the BF is. It’s not hard to imagine users adding a little tape to the lower edge of the camera or being tempted to chamfer the edge with a fine file, once they come to live with the camera.
I’ve primarily used it with the Sigma 35mm F2 prime and the Panasonic 20-60mm F3.5-5.6 lenses, both of which are small and light enough that it’s been comfortable to use.
Battery
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The BF uses a new 11.88Wh BP-81 battery. This will power the camera to a CIPA rating of 260 shots per charge. As always, the CIPA figure will tend to under-represent how many shots you’re likely to get, and we found it’s the camera’s propensity to show its charge percentage on its settings display that caused us to worry a little disproportionately.
Still, a rating of 260 is pretty low and means you may want to consider carrying a power bank if you plan to do more than occasional shots each day. Putting it on to charge overnight, just as you might do with your phone will probably be sufficient for everyday casual use, though.
A gentle press of the power button puts the camera into standby mode, but the battery will continue to drain at an appreciable rate. The BF starts up from cold quickly enough that this is usually a better approach.
Initial impressions
By Richard Butler
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Even the body cap is an over-engineered delight. |
The Sigma BF is one of the most unusual cameras we’ve ever encountered. On paper it looks like an under-specced rival to the Panasonic DC-S9 or even the Sony a7C II. Or, perhaps even a slightly re-purposed Sigma fp. But, even though it shares components and a small rectangular body, the BF is quite unlike any of these cameras.
Sigma’s CEO, Kazuto Yamaki talked about completely re-thinking the camera’s interface to pare it back to the fundamental things a camera needs to offer, in an attempt to make it simple to use, with the aim of making a camera for everyday use. And the more I use the BF, the more I think I understand this intent.
The idea of a dedicated settings display, leaving the main screen as a means of composing your image and positioning the focus point is a refreshingly simple one, undermined only by the challenge of viewing a fixed LCD in bright light. The decision to display only one setting, rather than a full array of settings and icons makes it very quick to interpret and I did find it made me consider what changes I wanted to make, shot-to-shot, in a way I don’t on a more conventional twin-dial camera.
This really hit home when I realized I prefer to set aperture from the camera, rather than using an aperture ring; I think the camera works best with everything controlled from the settings display, rather than trying to increase the number of control points.
Another surprise was how good the BF’s autofocus appears to be. Its subject tracking is very simple to use and impressively tenacious, while its eye detection works well and can be left turned on without minimal risk of the camera prioritizing nearby faces ahead of a different subject you’ve selected.
There are distinct downsides, though. The lack of mechanical shutter not only means there’s a risk of rolling shutter and that the camera can’t be used with flash, it also means it’s quite prone to banding caused by the inherent flicker of artificial lights. This can be fairly subtle at longer shutter speeds but becomes increasingly apparent in short exposures, limiting its use as an indoor camera, despite a sensor that works well in low light.
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Sigma 35mm F2.0 | F4.0 | 1/500 sec | ISO 400
Photo: Richard Butler |
Sigma’s sometimes quite dramatic color modes may not be to everyone’s tastes, and I’m not wholly convinced by the ‘Light Source Priority’ auto white balance mode, that tries to maintain some of the character of the detected light source. But even when the results are unexpected, they’re often interesting.
The BF’s battery life is also quite short. An external charger is available, if you want to keep a second battery topped-up, but mainly it’s a case of remembering to put the camera on to charge regularly, just as you might for your smartphone.
Other than a slight concern about the sharp lower front edge, I’m really looking forward to spending more time with the BF. It’s not a camera that lets you respond quickly to the unexpected; instead it’s one that makes you slow down and look for the photos you might otherwise not notice.
Sigma BF sample gallery
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