Nokia Lumia 920 Camera Review
2 DxOMark Mobile Report: Nokia Lumia 920
DxOMark Mobile Report: Nokia Lumia 920
With a DxOMark Mobile score of 66 the Nokia Lumia 920 is occupying a space at the lower end of the DxO smartphone ranking. Its score is the same as the HTC 8X Windows phone, but it cannot keep up with the best in class such as the Nokia 808, Apple iPhone 5 or Samsung Galaxy S3.
The DxOMark team report that the Lumia 920 captures images with good overall exposure, shows good contrast even in difficult situations and very low noise, even under extreme low-light conditions. The latter is achieved by using exposure times about four times longer than most smartphones under similar conditions. Optics stabilization then compensates - at least partly - for the expected motion blur.
On the downside: "texture and sharpness are poor, even under bright light," "white balance is unstable," "colors are slightly too saturated" and "autofocus is neither stable nor repeatable for objects closer than 2m."
In video mode, DxOMark's engineers reported that the Lumia 920 offers "efficient stabilization in low light and bright light for moderate motion" and low noise. On the other hand "autofocus is inaccurate, even in bright light, white balance is unstable, even with constant lighting" and "Jello effect and rotation are not corrected, making stabilization performance only average for stronger motion."
Dr. Frédéric Guichard, DxO Labs’ Chief Scientific Officer, said: '“The Lumia 920 outperforms the highly-regarded Nokia 808 Pureview for video but for stills it misses the mark slightly. Exposure and contrast are generally good even in difficult lighting, and with very low noise levels that are mainly a result of the longer exposure times made possible by stabilization. The main drawbacks are disappointing autofocus accuracy, poor sharpness and some lack of texture.”
Color, Exposure and Contrast
The DxOMark team found that the Lumia 920's "images usually have good contrast even in difficult situations", with good overall exposure. However, DxO found "strong color shading with fluorescent illumnants" and "slightly too saturated colors." While noise levels are relatively low in low light, it was noted that "in extreme low-light conditions exposure time is about four times longer than for most smartphones" and that "the optical stabilization does not compensate for all the subsequent motion blur." Because of this DxOMark scored the Nokia Lumia 920 at 68/100 for color in bright light and 58/100 in low light.
Overall DxOMark awarded the Nokia Lumia 920 scores of
- 4.5 out of 5 for Exposure
- 3.0 out of 5 for White Balance accuracy
- 2.5 out of 5 for Color shading*
- 3.0 out of 5 for Color Rendering in low light
- 3.5 out of 5 for Color Rendering in bright light
*Color Shading is the nasty habit cellphone cameras have of rendering different areas of the frame with different color shifts, resulting in pictures with, for example, pinkish centers and greenish corners.
Noise and Details
DxOMark's engineers reported that the Nokia Lumia 920 images show "very low noise even in low light thanks to longer exposure time" but that "images are not very textured" and "many details are blurry, even outdoors."
Texture Acutance is a way of measuring the ability of a camera to capture images that preserve fine details, particularly the kind of low contrast detail (textures such as fine foliage, hair, fur) that can be blurred away by noise reduction or obliterated by excessive sharpening.
Sharpness is an important part of the quality of an image, but while it is easy to look at an image and decide visually whether it's sharp or not, the objective measurement of sharpness is less straightforward.
An image can be defined as "sharp" if its edges are sharp and if fine details are visible, but in-camera processing means it's possible to have one of these (sharp edges) but not the other (fine details). Conventional MTF measurements tell us how sharp an edge is, but have drawbacks when it comes to measuring fine detail preservation. Image processing algorithms can detect edges and enhance their sharpness, but they can also find homogeneous areas and smooth them out, to reduce noise.
Texture Acutance, on the other hand, can qualify sharpness in terms of preservation of fine details, without being fooled by edge enhancement algorithms.
At first sight, the images from these two cameras may appear equally sharp. A sharpness measurement on edges will indeed confirm this impression, and will even show that the second camera is sharper. But a closer examination of low contrasted textures shows that the first camera has a better preservation of fine details than the second. The purpose of the Texture Acutance measurement is to qualify this difference.
Visual Noise is a value designed to assess the noise in an image as perceived by the human visual system, depending on the viewing condition (size of image, size of screen or print, viewing distance). The measurements have no units and can be simply viewed as a weighted average of noise standard deviation for each channel in the CIE L*a*b* color space. The lower the measurement, the less noise in the image.
Noise & Detail Perceptual scoring
- Texture (bright light): 2.5 out of 5
- Texture (low light): 2.5 out of 5
- Noise (bright light): 4.0 out of 5
- Noise (low light) 4.0 out of 5
Phone cameras, like entry-level compact cameras, tend to suffer from artifacts such as sharpening halos, color fringing, vignetting (shading) and distortion, which can impact on the visual appeal of the end result. DxOMark engineers measure and analyse a range of artifacts. Their findings after testing the Nokia Lumia 920 are shown below:
- Sharpness is not uniform across the image field
- Strong color fringing
- Sharpness 3.0 out of 5
- Color fringing 3.5 out of 5
- Ringing center: 3.2%
- Ringing corner 2.0%
- Max geometric distortion 0.5%
- Luminance shading 5%
Distortion & Chromatic Aberrations
DxOMark also tests autofocus accuracy and reliability by measuring how much the accutance - sharpness - varies with each shot over a series of 30 exposures (defocusing then using the autofocus for each one). As with other tests these results are dependant on the viewing conditions (a little bit out of focus matters a lot less with a small web image than a full 8MP shot viewed at 100%). Using the 8MP equiv. condition the Nokia Lumia 920 results are unusually low, with an overall score of only 28/100 in bright light and 38/100 in low light.
It's worth noting that autofocus starts from a default position which is infinity in default mode and 20cm in close up mode. If the focus is not reached, the default position is chosen.
With our software version, the AF default mode is the macro mode, which can be a source of errors.
- AF is fast for objects more than 1m away
- Unstable AF in both bright and low light
Autofocus starts from a default position which is infinity in default mode and 20cm in close up mode. If the focus is not reached, the default position is chosen. With our software version, the AF default mode is macro mode, which can be a source of errors.
DxOMark scored the Nokia Lumia 920 71/100 overall for its flash performance, deducting points for occasional white balance issues in mixed light.
- Good color preservation
- Low noise
- Exposure is stable with the flash
- White balance is red when flash is mixed with an additional tungsten light source
Overall DxOMark Mobile score for Photo: 64 / 100
DxOMark engineers put phone cameras through a similarly gruelling set of video tests, and you can read their full findings on the DxOMark website here. We'll simply summarize for you. DxOMark found the Nokia Lumia 920's exposure and color reproduction to be good. However, the white balance is very unstable, even in daylight, image stabilization for stronger motion is only average and the autofocus severely lacks accuracy when refocusing to infinity. In this case, it starts refocusing from macro distance to infinity, with visible lens breathing.
- Efficient stabilization in low light and bright light for moderate motion
- Good noise
- Unstable white balance, even with constant lighting
- Color shading
- Inaccurate autofocus, even in bright light
- Jello effect and rotation are not corrected, making stabilization performance only average for stronger motion
Overall DxOMark Mobile score for Video: 70 / 100
Sony has added a 12-24mm F2.8 to its top-shelf 'G Master' series of lenses. It's the widest constant F2.8 zoom currently offered for full-frame, with a hefty price tag to match: it will sell for $3000 when it ships in mid-August.
Take a look at the view from Sony's new ultra-wide F2.8 zoom – we paired it with the a7R IV for some initial shooting.
Canon's EOS-1D X Mark III is one of the best DSLRs ever made. With fast burst speeds, great video quality and impressive autofocus, the 1D X III is equal parts cinema rig and sports shooter. Find out how it fares against steep competition in our full review.
Nikon Rumors is reporting that Nikon will announce successors to its Z6 and Z7 camera systems by the end of the calendar year.
Canon says the event, set to take place at 14:00 CEST in two days on July 9, will be its 'biggest product launch yet.'
The Verge Video Director, Becca Farsace, shows how she built a custom Raspberry Pi camera with effectively zero coding knowledge over the course of just three days.
The EOS R5 has been in the works for some time, and Canon has published a handful of specifications, but there's still plenty we don't know. What are you hoping to see from Canon's forthcoming flagship camera?
Canon's CE-SAT-IB satellite camera was destroyed alongside six other satellites during Rocket Lab's ironically-named 'Pics or It Didn't Happen Mission.'
This sample gallery includes images from our recent review of the Tamron 28-200mm F2.8-5.6 Di III RXD zoom lens. Check out these photos to see how it performs, from wide-angle to telephoto and everything in between.
The Tamron 28-200mm F2.8-5.6 Di III RXD provides a wide zoom range in compact, weather-sealed design. Find out why it's Chris and Jordan's new favorite travel lens.
Kodak Portra 800 is a wonderful and versatile color film. And any rumors of it being discontinued, we're pleased to report, are simply untrue. That's a good thing, because it's capable of producing lovely results in all sorts of conditions.
Boering has left the World Press Photo without much of an explanation from either him or the organization, but he tells DPReview the COVID-19 pandemic is forcing the WPP to change the way it makes money.
The standard-size deck of playing cards features unique photography-oriented artwork and act as cheat sheets for photographers.
The Sony ZV-1 and Panasonic Lumix DC-G100 are the first cameras we've seen that are overtly designed with vlogging in mind – and the changes they represent could have implications for the future of all cameras.
The utility allows the E-M1X, E-M1, E-M1 Mark II, E-M1 Mark III and E-M5 Mark II cameras to be used with video conferencing apps over USB.
Olympus is showing final images of its under-development 150-400mm F4.5, which it says will arrive this winter. An unspecified macro and 8-25mm F4 Pro have also been added to the lens roadmap, and the E-M1X's AF gains bird detection.
The scam, which involves sending fake copyright violation notices, has been circulating on the social media platform since at least June 9.
Fujifilm is one of just two producers of tape media (the other being Sony) and it is hard at work on a breakthrough that will allow single tape storage drives to offer 400TB capacities in the coming years.
The National Parks Service says it's investigating the incident, which took place just two days after the park opened following a shutdown due to the COVID-19 pandemic.
Professional full frame lenses are usually large and have fast apertures. In this episode of DPReview TV, Chris and Jordan argue that there's a need for slow professional lenses – inspired by some of their favorite Micro Four Thirds lenses.
The camera maker joins Olympus, Fujifilm and others is a legal tussle over US digital camera technology patents held by DigiMedia Tech.
NASA's Solar Dynamics Observatory (SDO) photographs the sun every 0.75 seconds. In its first decade in space, the SDO has captured more than 425 million images of the sun. NASA has compiled these images into an amazing time lapse, come check it out.
The lens is available for Leica M, Sony FE, Nikon Z and L-mount camera systems, and now holds the title as the world's widest rectilinear lens for full-frame camera systems.
Tamron's new 28-200mm F2.8-5.6 is a versatile zoom lens for Sony E-mount. Well-suited for travel photography, it's compact, lightweight, and fast/quiet to focus.
Fujifilm has announced that its GF 30mm F3.5 R WR wide-angle lens for its medium format cameras will ship in late July or early August.
Fujifilm's latest lens is a sharp, reasonably compact and well-built wide-angle for the company's GFX medium-format cameras. We took it out and about in the warm Seattle summer with the company's 50 and 100 Megapixel camera bodies to see what it can do.
Fujifilm has issued firmware updates to the GFX 100 and GFX 50 models, with the 100MP camera gaining the most significant improvements.
Although the channel is still growing, it currently has nine videos that offer concise overviews of just a few of the cameras Japan Camera Hunter founder Bellamy Hunt has sitting around his Japanese storefront.
ON1 has launched ON1 360, the latest version of ON1 Photo RAW 2020 with ON1's new Photo Mobile application for iOS, iPadOS and Android mobile devices. The new solution syncs raw processing between your mobile device and computer.
Switching screw-on filters between lenses of different thread sizes is much quicker with the Revoring adjustable step-up ring. It uses a sprung iris that expands to fit a range of filter thread sizes, so a single filter can be used on multiple lenses