Comparisons Between IR Converted Cameras with Different Filter Depths
Clive R. Haynes FRPS
Above: One of the two locations for the comparison
During one of my Infrared Workshop sessions in conjunction with PermaJet, several participants took the same two subjects from more or less the same angle. This allowed us to compare and contrast differences between camera makes, models and the IR filter used. As expected the results show quite an array of tonal differences.
Note 1: the first four comparative images for each subject, after the initial RAW stage, are presented 'straight' without additional adjustments for light, shade or contrast whether general or selective. The tonal range at each stage could be managed for personal expression and preference.
Note 2: the final two images for each subject have received additional editing to reveal the potential of the picture. The two methods are a TopazLabs plug-in (Microcontrast improvements) and the recovery of so-called 'false colour' by swapping the image to Lab Mode (in Photoshop). The examples of 'false colour' certainly won't suit all tastes and they're presented to illustrate some of the fundamental differences between the cameras, IR filter depth and the different sensor arrays. Typically the older camera sensors present a wider range of ('false') colour as revealed in 'channel-swapping' and Lab Mode.
Note 3: Chromatic Aberration: This can present a problem and is particularly relevant for 'False Colour' processing. Click on the Nikon D610 link below as the description includes screen-grabs about chromatic aberration.
The following pages illustrate the results.
Alternatively you can select from the direct links, listed in page order, below.