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Forum: Troubleshooting and Beginner Help 12-15-2014, 05:47 PM  
Pentax 645 120mm macro lens will mount on 645N but not on 645NII
Posted By aerou
Replies: 2
Views: 1,761
Thank you for the suggestion.

I will try to measure it tomorrow and take some macros of the locking parts to spot something like that.

Since I am still new to the 645 system, I firstly wanted to rule out if it is an official incompatibility (but then it should have been in the manual) or a minor defect in the body or the lens.
Forum: Troubleshooting and Beginner Help 12-15-2014, 09:03 AM  
Pentax 645 120mm macro lens will mount on 645N but not on 645NII
Posted By aerou
Replies: 2
Views: 1,761
Hello guys.

I wonder if someone could help me with this or has any info, because I searched a lot, and couldn't find anything similar to what I am experiencing.

I have been using a medium-format film Pentax 645N with a manual 120mm F4 macro lens without a problem.

I wanted to try it with a 645NII body for the mirror-lockup feature, but the lens wont lock in the bayonet mount.

On the 645N, I simply twist it and it locks, easily, securely and every time. But I already tried two different 645NII bodies and on both the 120mm macro lens, so twisting the aperture ring twists the lens off.

Here is a video:














Youtu.be




It occurs only with my 120mm F4 macro, which is a manual -A 645 lens. My other -AF 645 lenses 75/2.8, 45-85/4.5 and 150/2.8 lock fine.
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