This is not specific to large format, but it's a fun project and maybe someone will come with an idea. I like the effect I get when I attach a +1 diopter to my Nikon 2,8 80-200. Between 180 and 200mm at 2,8 to 3,5, I get a progressive diffusion effect and exceptional bokeh, even better effect to my eyes than what the Imagon produces with it's starred bokeh. I can obtain something approaching with the 300/4,0 as well. But I wish I could keep this effect with more distance to the subject than what the +1 diopter lens allows for on digital, which is no larger than 5" target, or obtain this with a shorter lens to have more angle, but it seems that only long range zooms produce this aberration. Of course I wished I had found a 0,25 diopter lens for my zoom to try first, but they have disappeared from the market in such sizes. The problem with SF lenses is that it's not possible to focus shorter than infinity, so I would probably need something else than the close up lens. I could perhaps buy a cheap midrange zoom and "reorganize" the elements if I knew what to do, but I have no idea how to get there. I remember reading from someone who had polished the front cell to change it's curve, but I am not equipped to do that. Would someone see another practical solution? But this is not the effect that can be obtained with diffusing or softening filters which I have also.
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