Infrared Phase One P45+

Background

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

Downloads

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

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

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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

Downloads:

Screen Resolution Full-frame JPGs in a ZIP File

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

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Phase One P25 and Leaf Aptus 22

August 2005

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Download Leaf Aptus 22 full resolution JPG

Download Phase One P25 full resolution JPG

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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.

Download Phase One Wide Angle Solution Comparison

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