I need a 90 mm summacron for my m2 (drop me a line off list if anyone has one) Yes I know the 105 f 2.5 nikkor you speak of great sharp portrait length lens for the nikon F! we have a small 105 mm red dot Goertz we used for copy work on 2 1/4 x 3 1/4 in compur shutter the one on the Robertson process camera I used in the 70s was 18 inch focal length as I remember. Ed# In a message dated 3/9/2016 6:53:06 P.M. US Mountain Standard Time, healyzh at aracnet.com writes: field lens even then, and Nikkor 105mm that was made in mid 1960s. Personally I need a nice ASPH 28mm or 35mm Summicron. I have the original Nikkon 35mm f/2, one of the very first made, it?s been Ai?d, and it?s an AMAZING lens. The Goerz Dagor?s are actually pretty cheap at the moment, I?ve been thinking about them for my 8x10. I?m using a mixture of modern lenses on my 4x5. Somehow I don?t ever expect a digital 4x5 back to be affordable. I know one Photographer that has one, and it?s really only useable for reproduction work, in the studio. Keep in mind that digital backs that can cover 4x5 or larger are scanning backs. Have you considered adapting a scanner as one? I?ve seen in the past where folks have done that. Personally except for one project, I shoot B&W film when I?m shooting 4x5 or 8x10, I then process and print it myself. For the 8x10 (and hopefully eventually 11x14), I only shoot B&W, and only contact print. Zane