Our new Dynamic Range measurement system involves shooting a calibrated Stouffer Step Wedge (13 stops total range) which is backlit using a daylight balanced lamp (98 CRI). A single shot of this produces a gray scale wedge from (the cameras) black to clipped white (example below). Each step of the scale is equivalent to 1/3 EV (a third of a stop), we select one step as 'middle gray' and measure outwards to define the dynamic range. Hence there are 'two sides' to our results, the amount of shadow range (below middle gray) and the amount of highlight range (above middle gray).
To most people highlight range is the first thing they think about when talking about dynamic range, that is the amount of highlight detail the camera can capture before it clips to white. Shadow range is more complicated, in our test we stop measuring values below middle gray as soon as the luminance value drops below our defined 'black point' (about 2% luminance) or the signal-to-noise ratio drops below a predefined value (where shadow detail would be swamped by noise), whichever comes first.
ISO Sensitivity and Dynamic Range
The DP2's dynamic range pretty consistent in offering the ability to represent 3.8 stops of information above middle gray. The exception is ISO 50 which has been added in order to offer slower shutter speeds and is essentially an over-exposed ISO 100.
|Sensitivity||Shadow range||Highlight range||Usable range|
|ISO 50||-5.0 EV||3.1 EV||8.1 EV|
|ISO 100||-4.6 EV||3.8 EV||8.4 EV|
|ISO 200||-4.9 EV||3.8 EV||8.8 EV|
|ISO 400||-4.0 EV||3.8 EV||7.8 EV|
|ISO 800||-2.1 EV||3.7 EV||5.8 EV|
Dynamic Range compared
The DP2's dynamic range certain does a good job of keeping up with its peers, though it loses shadow range to noise at much lower ISOs than would be expected of contemporary cameras. Its handling of highlights leaves little to complain about. However, the occasionally unpredictable metering on the camera means that you have to expose your images carefully to make the most of this capability.
|Camera (ISO 100)||
|Sigma DP2||-4.6 EV||3.8 EV||8.4 EV|
|Olympus E-P1||-5.7 EV||3.3 EV||9.0 EV|
|Sony DSLR A330||-5.2 EV||3.5 EV||8.7 EV|
|Ricoh GR Digital III||-4.9 EV||3.0 EV||7.9 EV|
The wedges below are created by our measurement system from the values read from the step wedge, the red lines indicate approximate shadow and highlight range (the dotted line indicating middle gray).
Experience has told us that there is typically around 1 EV (one stop) of extra information available at the highlight end in RAW files and that a negative digital exposure compensation when converting such files can recover detail lost to over-exposure. For the purpose of this comparison we converted the DP2's RAW files at Adobe Camera Raw's default setting and with a set of parameters that would help give a maximum dynamic range (though not neccesarily a very useful image).
- ACR Default
- ACR 'Best': Exposure: -1.35EV, Contrast -50, Brightness +85, Blacks 0
|JPEG||-4.6 EV||3.8 EV||8.4 EV|
|ACR Default||-3.6 EV||3.5 EV||7.1 EV|
|ACR 'Best'||-6.0 EV||4.5 EV||10.5 EV|
WARNING: Although Adobe Camera Raw is able to retrieve some 'luminance' (brightness) of wedge steps which were previously clipped there's no guarantee of color accuracy as individual channels may clip before others.
To demonstrate the effect, we shot the same shot at +1.33 EV and at 0.33EV intevals above that. Trying to recover detail from the +2.0EV over-exposed image didn't yield any more detial once we passed -0.9EV digital exposure compensation. However, on the 1.33EV image, we were able to match the image brightness with -0.5EV exposure compensation and this yielded considerably more detal (shown below).
This suggests that there were highlights that should have been within the reach of the brighter image but that they were lost to clipping. It's reasonable to assume there's nearer 0.7 EV of recoverable highlight information than the 1.0EV we'd usually expect to see. That said, Sigma Photo Pro's highlight recovery option is good at making the most of that recoverable range.
|2.0 EV over-exposed image||-0.9 EV digital exposure compensation|
|1.33 EV over-exposed image||-0.05 EV digital exposure compensation|
|.....the ROYAL LOTUS 2017/08/25-NEW YORK..... by Chiwat|
from Wild flowers
|Coffee and Mango cake by clicker88|
from Another cup of coffee
The new iZugar 3.25mm F2.5 super fisheye lens offers an insane 220-degree angle of view. That means it can basically see behind itself... good luck keeping your feet out of the shot.
You'll laugh, you'll cry, you'll remember that time you took a picture of the frozen pizza baking directions.
A Craigslist poster has discovered the worst possible way to photograph a car: taking pictures of pictures displayed on a cracked and scratched up smartphone screen.
With the iPhone X coming out soon, the title probably won't last, but the iPhone 8 Plus is officially the best smartphone camera DxOMark has ever tested, and the iPhone 8 is second.
Kodak's new Facebook Messenger chatbot is trying to bring back the 'Kodak Moment' by digging up your old social media photos and trying to sell you prints and custom coffee mugs.
Affinity Photo for iPad was touted as "the first full blown, truly professional photo editing tool to make its way onto the Apple tablet." This update makes it that much more convenient.
Yashica has released a new teaser video, and this one claims they'll be releasing an "unprecedented camera" in October on Kickstarter. Ready... set... speculate!
Storage solutions company Synology has just released its very first 6-bay NAS tower. Combined with the DX1215 expansion units, it can hold and control up to thirty drives.
We're always expanding our collection of product overview content, and we've just added videos for the Canon EOS 6D Mark II, the EOS Rebel SL2 and EOS M6.
The venerable Canon PowerShot G1 was announced seventeen years ago this week, marking the start of a line of enthusiast-focused compacts that's still alive and kicking.
Super macro photographer Can Tuncer captured these incredible close-ups of a single peacock feather using a special setup and three different microscope lenses.
After successfully crowdfunding the Biotar 75mm F1.5, Oprema Jena is at it again. This time they're bringing back the Biotar 58mm F2: the world's only lens with a 17-blade aperture.
Adobe's move to a subscription model is treating it very well indeed. The company has posted record revenue for the second quarter in a row, hauling in a mind-boggling $1.84 billion.
More details have emerged about the potential sale of Blackstone's 45% stake in iconic camera brand Leica.
Popular mobile editing app Snapseed just got a major update that includes a new interface and 11 new presets for both Android and iOS, as well as adding the Perspective tool to the iOS version.
It might sound like a strange idea, but taking macro photos of boiling water can actually result in some really cool photographs. A good photo experiment for a rainy day.
The database was created to "break with the narrow lens through which history… has been recorded" by equipping those who commission photography with "the resources to discover photographers of color available for assignments.
Lensbaby has released two new optics for their special "optic swap system." The Lensbaby Sweet 80 Optic gives you that trademark sweet spot of focus, while the Creative Bokeh optic gives you 9 different drop in aperture plate options to play with.
TechCrunch has already posted their review of the upcoming iPhone 8 (not yet the iPhone X), and they're calling it "a look into the augmented future of photography."
Affinity Photo is a $50 photo editing software with no subscriptions. That's it – pay for it once and you're done. And we think it's actually pretty darn good.
Instagram is currently testing a major change to the app's profile layout: replacing the 3-photo across grid with a 4-photo grid... and some users are NOT taking the news well.
A report by USSRPhoto is shedding some light on the return of the famed Zenit camera brand. It seems the full-frame mirrorless camera they're working on will be made in part by Leica using components from the Leica SL.
According to a reliable Korean report, Samsung is developing a smartphone sensor that's capable of super slow motion. Translation: Samsung's next batch of Galaxy smartphones may be able to shoot 1,000fps.
This simple photograph of a seahorse and Q-tip has taken the internet by storm. We spoke to photographer Justin Hofman about how it was captured, and what it means to him.
After a massive leak last week, Profoto has officially debuted the Profoto A1: the company's first on-camera flash system that they're calling "the world's smallest studio flash."
"When the first hyperfocal distance charts were designed, someone decided that an acceptably sharp background contained some blur — enough to notice in a medium-sized print [...] After that point, nearly every other hyperfocal chart followed suit."
The Canon EOS Rebel SL2 (also known as the EOS 200D) is the company's impressively compact entry-level DSLR. Packing a 24MP APS-C sensor, DIGIC 7 processor and Dual Pixel AF, it promises a lot of bang for the buck. And while not mind-blowing, it handles most tasks very well.
Correct these four common composition mistakes and your photos will be more balanced, tell a better story, and lead your viewer's eye where you want it to go.
The rugged, compact 360° action camera Kodak unveiled at Photokina in 2016, the Kodak PixPro Orbit 360, is finally available in the United States.
iOS 11 launches tomorrow, and it'll save all of your pictures in a new high efficiency image format called HEIC. Fortunately, there's now a converter that will let you turn those photos back into JPEGs.