IQ180 LCC Correction

This Issue Only Applies to Non-Retrofocus Wide Angle LensesWhen Used on Technical Cameras. Ordinary Phase / Schneider / Mamiya WA Lenses on DF Cameras Are Not Affected 
By mid-May Phase One's newIQ180back has started to ship to customers. Some of these photographers are using the back with technical cameras and non- retrofocus wide angle lenses. There have started to be reports on the web that there are serious colour cast and banding problems with this combination.
Indeed there are, but Phase seems to have anticipated this problem and has a solution at hand. Before looking at what it is though, let's briefly summarize the whole issue ofLens Cast Correction(LCC).
With real wide angle lenses, the kind used on technical cameras, the rear of the lens sits very close to the sensor. An example of such a lens is the 43mm Schneider APO Digitar , which I happen to own and use on myAlpa STCcamera. This causes lens casts – where one side of the image appears magenta and the oth...