Panasonic DMC-GH2 Review
Resolution Chart Comparison (JPEG and RAW)
Images on this page are of our standard resolution chart which provides for measurement of resolution up to 4000 LPH (Lines Per Picture Height). A value of 20 equates to 2000 lines per picture height. For each camera we use the relevant prime lens (the same one we use for all the other tests in a particular review). The chart is shot at a full range of apertures and the sharpest image selected. Studio light, cameras set to aperture priority (optimum aperture selected), image parameters default. Exposure compensation set to deliver approximately 80% luminance in the white areas.
What we want to show here is how well the camera is able to resolve the detail in our standard test chart compared to the theoretical maximum resolution of the sensor, which for the charts we shoot is easy to work out - it's simply the number of vertical pixels (the chart shows the number of single lines per picture height, the theoretical limit is 1 line per pixel). Beyond this limit (when talking about line pairs usually referred to as the Nyquist frequency) the sensor cannot faithfully record image detail and aliasing occurs.
This limit is rarely attained, because the majority of sensors are fitted with anti-aliasing filters. Anti-aliasing filters are designed to reduce unpleasant moiré effects, but in doing so, they also reduce resolution (the relative strength and quality of these filters varies from camera to camera). In theory though, a sensor without an AA filter, when coupled with a 'perfect' lens, will deliver resolution equal to its Nyquist limit. Therefore, even though it may be effectively unattainable with normal equipment in normal shooting situations, an understanding of a sensor's theoretical limit provides a useful benchmark for best possible performance. Nyquist is indicated in these crops with a red line.
On this page we're looking at both JPEG and Raw resolution. For a (more) level playing field we convert the latter using Adobe Camera Raw. Because Adobe Camera Raw applies different levels of sharpening to different cameras (this confirmed) we use the following workflow for these conversions:
- Load RAW file into Adobe Camera RAW (Auto mode disabled)
- Set Sharpness to 0 (all other settings default)
- Open file to Photoshop
- Apply a Unsharp mask tuned to the camera, in this case 100%, Radius 0.6, Threshold 0
- Save as a TIFF (for cropping) and as a JPEG quality 11 for download
|JPEG (4608 x 3456) 4.7MB||RAW (4608 x 3456) 3.0MB|
At is approaches Nyquist (3456lph) the GH2 isn't quite as good as the Olympus E-5 at describing true detail, but some image structure can still be discerned even at 3600lph and beyond (at this point it's technically 'false' detail, but in real-world images it can contribute to the impression of texture and fine detail).
The FlexTILT Head 3D is the first product in Edelkrone's new ORTAK lineup, which is specifically designed to piggyback off the growing trend of 3D printing.
They may not offer latest generation technology, but the Canon T7 and Nikon D3500 boast a price point that's tough to argue with. We think that the D3500 has a slight edge in this head-to-head comparison.
State institutions can't be forced to pay for pictures they take from the internet, according to a Texas appeals court.
Chris and Jordan go back to basics in this week's episode, spelling out the meanings of some common photographic terms that newer photographers may not understand.
Japan's parliament passed a law this week outlawing the operation of a drone while under the influence of alcohol.
Watch out Facetune users—Researchers have created an AI program that will detect manipulations made to portraits and reverse the edits.
Investor Daniel Loeb wants the business unit to become a completely independent public company with its own stock listed in the Japanese stock exchange.
National Geographic has unveiled the winning photographs, including the Grand Prize winner of its 2019 Travel Photographer of the Year contest.
The new method applies correction edits locally to faces while leaving the background and other image elements untouched.
Following a call from the Hong Kong Journalist Association, photojournalists and journalists showed up to a Hong Kong Police Force press conference to protest the treatment of journalists during city-wide protests of a controversial extradition bill.
Samsung Portugal used the Galaxy S10+ to capture 943km of Portugal's coastline from out at sea over the course of an eight-day trip.
Operators have a year to prepare for a new set of common drone rules that will transcend borders. Before, remote pilots had to abide by each country in the European Union's specific set of regulations.
Standardizing processes across multiple photographers and saving them time in the studio is the aim of this new, customizable version of Capture One.
While on assignment in Japan, Chris and Jordan had a couple days to shoot with the Fujifilm XF 200mm F2 telephoto lens, which Chris nicknamed 'The Big White Sharp'. To make things more interesting, Jordan filmed this entire episode using the new Fujifilm GFX 100 medium format camera.
Firmware version 2.00 adds Animal Eye AF, support for Sony's RMT-P1BT wireless remote commander and addresses various stability issues.
Apollo Global Management has agreed to acquire Shutterfly for $2.7B and says it plans to merge it with Snapfish, which was also acquired for an undisclosed sum.
Record audio to go with your instax picture and the viewer can play it back via a QR code on the print. Sounds clever!
In an unusual move, Google has revealed its upcoming Pixel 4 phone well ahead of its expected launch in the fall. A larger camera bump featuring at least two rear-facing cameras is visible in the image tweeted by an official Google account.
These small, fast primes aren't cheap, but neither are the cameras you're meant to mount them to.
Shiftcam's Pro line lenses attach to smartphones via dedicated cases or a universal lens mount.
Cinema5D has shared part one of a two-part documentary that dives into the process Fujifilm went through to bring its GFX 100MP medium format mirrorless camera to life.
Canon's EOS Rebel SL3 / EOS 250D is the latest in the company's line of diminutive DSLRs. Despite its compact dimensions and fairly modest price, it has a modern sensor and produces great photographs - find out if it's right for you in our full review.
Bring your passion for photography and help us build the future of DPReview. Read all the details and find out how you can apply to join our team.
Skylum has announced the latest update to Luminar, bringing with it speed improvements and new features for macOS and Windows users.
The pop-up design allows for image and video recording in both folded and unfolded state.
The 7Artisans 60mm F2.8 APS-C macro lens is available for Canon EOS M, Canon EOS RF, Fujifilm X, MFT, Nikon Z and Sony E mounts.
We sat down recently with Yasuyuki Nagata, head of Sony's global interchangeable lens business, to discuss the company's two new telephoto lenses and Sony's approach to mirrorless product development.
Chris and Jordan, along with Senior Editor Barney Britton, traveled to New York for a hands-on look at Sony's newest super-telephoto lenses: the FE 200-600 F5.6-6.3 G OSS and the FE 600mm F4 GM OSS. Find out what they think so far, and vote to tell us who shot the best sample images.
Two new full-frame telephoto lenses for the alpha system, two very different target users (and price points). Take a closer look at Sony's newest FE glass.
If Sony's new 600mm F4 is a bit too much lens/cash for you, not to worry, the 200-600mm F5.6-6.3 is here for all your telephoto needs. And what it lacks in terms of a fast constant aperture, it makes up for in it in focal length versatility. See our samples.