I came to digital Nikons with an array of mid-60's MF lens, some of which I have had satisfactorily converted by John White. Now for the rest of them: it seems that at least some conversions consist of milling away a portion of a projecting ridge of plastic or aluminum at the outside edge of the mounting surface. On contemporary lenses that space may be occupied by a flexible skirt that serves as a dust and rain excluder. Some of the lenses, tubes and teleconverters that I have, do not have that rigid projecting ridge and seemingly mount without difficulty and operate normally, that is, exposure by trial and error. The extension tube that came with the 55mm f3.5, PK13?, in fact allows unmodified lenses to be mounted. Of course, it restricts their use to close focus operations. Now the question: the Soligor 400mm f6,3 lens that I found to be quite sharp when used on the D5100 which was approved for non=AI lenses, also has no inflexible ridge that would prevent it from being mounted. Still, I have been unable to get myself to turn it fully into locked engagement for fear of damaging something. Can anyone reassure me? I would like to use this lens for small bird photos where my 28-300 is just a little short. The longer Nikon lenses are not in the budget at this time. Anyone out there have experience in these issues? Nikon call centers and forums DEFINITELY do not. If I am not making myself clear, let me know where the ambiguity lies. Tom
#1. "RE: Pre-AI mounting issues." | In response to Reply # 0Kilted_F3_nut Nikonian since 29th Jun 2004Sat 27-Apr-13 06:36 AM
Check the rear element area for any protruding metal that may be getting hung up on the CPU contacts or coming in contact with the mirror box. Tried to mount one of those old style Komura zoom teleconverters that go from 2x to 3x on a D5000. Wouldn't fit. But, worked fine on my F5.
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#2. "RE: Pre-AI mounting issues." | In response to Reply # 0Leonard62 Nikonian since 15th Mar 2009Sun 28-Apr-13 09:49 AM
Does the lens have a preset aperture or is it auto? I believe this lens was made both ways. If it is preset then it probably has a removable T mount in which case it would be no problem mounting. Can you post a photo of the rear of the lens so we can see what it is?
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#3. "RE: Pre-AI mounting issues." | In response to Reply # 2TBerryhill Registered since 16th Jan 2013Tue 30-Apr-13 11:45 PM
Len, I don't think I can post photos to the forum. If I understand the difference between preset and auto, then this lens is auto and behaved as such on the Nikkormat for which I bought it. It was a good, sharp lens on my D5100. I realize that its suitability for that mount does not indicate that it will be safe on the D600. From all I can determine, it should operate with no problems, but because I could not really afford the time and money that a postal trip to a Nikon repair facility would involve I have been reluctant to make that final fraction of a turn that would lock it into place. Thanks for the suggestion, though and perhaps there is someone out there with hands on experience with this. Tom