Digital Back Tests


Phase One Diffraction Test-v1e-small

Diffraction Test

Purpose of test

When lenses are stopped down to their smallest aperture opening they produce a softening effect due to diffraction. While general guidelines can be helpful (e.g. “avoid f/22”) the only way to be sure of diffraction for a given lens is to test. This is a test of the Hasselblad HC120mm lens and the Phase One 120mm D lens.

Definition of Diffraction

Diffraction is the bending of waves around obstacles, or the spreading of waves by passing them through an aperture, or opening (Wikipedia). In photography this bending of light causes hard lines and small details to blur.

Equipment / Testing Procedure

  • Heavy Tripod, mirror up, and self timer release
  • Hasselblad H2 body with HC120mm lens
  • Phase One AF Body (firmware 1.5) with Phase One 120mm Digital (“D”) Lens
  • Processed in Capture One with default sharpening, zero luminance noise reduction, and 40 color noise reduction


Phase One P40+, P45+, and P65+


Purpose of test

The medium format digital back marketplace can be quite confusing, even for the people who are supposed to be the experts. The only way that you will truly understand the new technology is to shoot any new system side by side the older systems. With the arrival of our new P40+ the first test that we wanted to conduct was a shooting scenario on a technical camera with movements. We wanted to answer the question, ” will the P40+ produce an LCC that was unacceptable.” The answer is clear in our examples, however so much more can be learned from this comparison than just LCC information. We will leave it up the veiwer to determine which relationships are more significant to them. Enjoy!

Equipment / Testing Procedure

  • Cambo RS with Schnneider Digitar 35mm f/5.6 XL Lens
  • 10mm of fall on rear standard
  • 1/4 second , f/11.5 , ISO 100 on all DB’s
  • Blue sky, direct sunlight, deep shadows, Capture Integration famous Alley
  • Nothing optically or on the camera body changed between DB exposure

-Sensor Sizes


-Test Setup


-Compare Print Sizes


-Compare Sensor Fall Off




More Info

Phase One P40+ at ISO 50 and ISO 800

Speed, Resolution, and Flexibility

The Phase One P40+ has just been announced. While we eagerly await delivery of our own unit to do extensive testing and evaluation we’re posting these shots provided by two photographers in Denmark for those who can’t wait to look at P40+ files.

For the first time in Digital Back history a new back has been announced only when it was ready to ship. So if you’re interested in a a demo contact us today.

Read more about the P40+



Images by Steen Tronsgaard and Kajsa Bjornberg

[top] Handheld Phase One 40+ with 80mm lens; ISO50, 1/80th @ f/4 – full 40 megapixel resolution

[bottom] Handheld Phase One 40+ with 75-150mm lens at 135mm; ISO800, 1/160th @ f/8 – full 40 megapixel resolution

[Download a ZIP file containing both full resolution JPGs]

Phase One P65+ at ISO 1600

Taking Medium Format Digital Backs where they’ve never been before

The Phase One P65+ offers a mode called Sensor+ which allows faster shooting, faster display of images when tethered, full frame composition, and higher ISOs while shooting at a very sharp 15 megapixel file size. Using a patented pixel binning technology decreasing the file size to 15 megapixels increases the native sensitivity by two full stops making the back’s ISO range 50-800 at full resolution or 200-3200 in sensor+ mode.

Often high ISO tests are done on a tripod in the studio with flash, which is the exact opposite of the situations where high ISO is needed. Instead our technician went out after sunset to shoot by the street lights of South Beach. Below is a handheld shot with the Phase One body, Phase One 80mm at f/2.8 and 1/125th sec shutter speed. The large area of deep shadow is also unusual in a published test of high ISO.

This was processed with default noise reduction and sharpening in Capture One 4.7 and saved as a 100% resolution JPG (a small web version appears below).

Download the full resolution JPG here and judge for yourself.

You can be sure we’ll be posting more high ISO shots soon.


P65+ on a Tech Camera

The Highest Resolution digital back with the Best Large Format Lenses


The above photo was taken by Dave Gallagher, Owner of Capture Integration in Elliot St. Pub, Atlanta using a P65+ on a Cambo Wide RS with a Schneider 35mm Digitar lens.

[Download the full resolution JPG here]

Phase One P65+

The Highest Resolution. The Largest Chip. The Highest Dynamic Range.


The Phase One P65+ is currently in pre-production, with a few prototypes in existence. Delivery is expected on the first production units in late 2008. Capture Integration was fortunate to host the first public showing in the US of the P65+ and took the opportunity to shoot both studio fashion and outdoor portraits. Below you will find a raw file and a processed JPG. We chose the development settings that we thought best emphasized the subject but you are welcome to download the raw and use your own development settings.

It is expected that once the production units ship, support for raw files will be added to Adobe Camera Raw and the several other programs which can read current Phase One raw files. However, since it is in pre-production the only raw developer which will read the P65+ raw file is Capture One 4.5 (which requires OSX 10.5.5 or XP SP3 or Vista SP1).

This new version of Capture One ( allows enormous flexibility in developing. Check out the Web Contact Sheet generated by Capture One 4.5 Pro showing some of the styles we considered.


Infrared Phase One P45+

p45+ IR composite


This article is about the Phase One P45+ IR which is a version of the P45+ modified for infrared photography. This test is to show the results of using various filters with the P45+ IR. It also compares the visible-only photographs of the P45+ IR with the visible-only photographs of the standard P45+.

In infrared photography the sensor (or film) can see infrared light, which is beyond the visible spectrum of light. It is easiest, though not entirely accurate, to think of infrared light as a 4th color after blue, green, and red. This allows for infrared+visible photography where the camera sees RGB and infrared. Infrared-only photography is possible by using a filter which removes visible light. By adding a filter which removes infrared light such a camera can also take standard (i.e. visible-only) photographs.

Test Equipment – Filters

For Infrared-only: Kodak 89B filter

For Infrared-only: Hoya R72 filter

For Infrared+visible*: Infracolor Orange 099

For Visible-only: 1st gen Phase One IR-Cut filter

For Visible-only: 2nd gen Phase One IR-Cut filter

For Visible-only: B+W 486 IR-UV-Cut Filter

*The infracolor orange filter removes about half of the visible spectrum

Test Equipment – Camera / Body / Lens

Standard Phase One P45+

IR-Modified Phase One P45+ (a.k.a. “P45+ IR”)

Hasselblad H2

Hasselblad HC80mm

Heavy Tripod

Testing Notes

1/125th or 1/60th sec at f11 using ISO50.

Triggered by Self Timer


Full-Res full-frame in native color space in a ZIP file

Low-Res full-frame in sRGB in a ZIP file

Phase One P45+ and P25+


Test Equipment:

  • Cambo Wide DS
  • Schneider Digitar XL 35mm f/5.6 lens
  • Heavy Tripod

Processing Method:

All raw-development was done with Capture One 4.1.1. Files were white balanced using Color Chart at image-bottom. Lens Cast was corrected using LCC. Images were upsized to 16bit TIFFs at 9000 pixels wide (to allow valid comparison between the different native resolutions) and sharpening disabled. Noise reduction set in Capture One 4.0 to 15/30 (which is low). Unsharp mask (100% 1.3pixel 1 threshold) applied to both files in Photoshop.

Testing Notes:

1/15th sec at f11 using ISO 50. 5mm of rise was given

Triggered by Cable Release


Screen Resolution Full-frame JPGs in a ZIP File

Upsized and equally sharpened crops as 8-bit TIFFs in a ZIP file

Phase One P25 and Leaf Aptus 22

August 2005

lvp - Aptus22_

Download Leaf Aptus 22 full resolution JPG


Download Phase One P25 full resolution JPG

Phase One’s Wide Angle Solution Comparison

This comparison done by Phase One is between a Schneider 35mm XL lens, as used on a Cambo Wide DS or Horseman SWD, and a Hasselblad HC 35mm lens.

Wide Angle Comparison Thumbnail   Download Phase One Wide Angle Solution Comparison