rupert_griffiths

<p>Hi,</p> <p>I am not a medium format photographer (maybe thinking about taking it up, but that's for another time).<br> However, right now I'm working on a scientific project for which we need to acquire the highest resolution medium format lenses available. They'll be mounted to DSLRs through adapters, so we can use any brand (or mix of brands) for which adapters are available. As I understand it, that rules out RZ67 lenses, for instance, with their bellows focusing and leaf shutters. Maybe a leaf shutter on its own could be jammed open or removed, but we do need to be able to adjust the focus and aperture (so no AF only lenses).<br> What we are looking for is lenses with minimal distortion, ideally with wide apertures that still offer good performance, and - most of all, and to the exclusion of all else - outstanding resolution. After that, a larger image circle is better than smaller, but anything from 6x4.5 upwards is still good. <br> We've already identified the Mamiya 645 300mm f/2.8 APO as an utterly fantastic lens to cover our needs for long focal lengths. Unless anyone can suggest anything better, we'll almost certainly be using that lens, with its 645 format and reported 70+lpmm across the field even close to wide open.<br> That leaves a need for something in the medium focal length range (80mm to about 130mm) and a wide angle option (under 80mm). We may look for a 150 or 200mm lens too, but looking at the experimental setup the wide lens is probably going to get most use. <br> In terms of price, cheap is always good, but we are not looking to economise on quality. </p> <p>I'd be very grateful for any advice on the very sharpest MF lenses that might fit our needs.</p>