Why won't a Kiev-88 to Pentacon Six adapter fit my Pentacon Six to Nikon F adapter?
Asked 2/22/2017
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2 answers
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I have a lens with a Kiev-88 mount and wanted to use it on Nikon F by stacking a Kiev-88 to Pentacon Six adapter with a Pentacon Six to Nikon F adapter. However, the Kiev-88 to P6 adapter is slightly too large to fit into the P6 to Nikon adapter. The mismatch is under 1 mm, but the metal parts will not mate.
Is there a standard inner diameter for the Pentacon Six mount, or is this a known compatibility issue between different P6-style mounts/adapters? I’d like to know whether the first adapter is oversized, the second is undersized, or whether some P6 adapters are simply not interchangeable.
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
9y ago
2 Answers
3
There's a reference in a flickr group discussion that addresses the issue you are experiencing.
I have this Arax adapter and it works well, but be aware that it will not fit many standard P6 camera mounts (it is larger in diameter than a regular P6 lens). Arax also sells a replacement camera mount ring which solves the problem for any Pentacon Six or Kiev 60. I discovered that my older (silver) P6 mounting ring worked fine (the newer black rings won't). You can also modify these rings on a lathe quite easily. It is the inner diameter of the front flanges that is the issue. This can easily be enlarged, and the ring still works fine with all normal lenses.
If your P6 to Nikon adapter is made for use with Kiev 60, Kiev 6, or 6C lenses then this is your issue.
A solution that doesn't require machining seems to be an additional locking ring. The adapter is on the left, the locking ring is on the right. It is currently listed by this eBay seller as an add-on to the K88 to P6 adapter. You may try contacting the seller and see if purchase of only the locking ring is possible.
Some sellers list P6 to Nikon F adapters that also include a K88 to P6 ring. If sold together one would presume the smaller additional ring properly fits the larger P6 to Nikon F adapter.
Originally by user15871. Source · Licensed CC BY-SA 4.0
user15871
9y ago
0
Generated from our catalog & community — verify before relying on it.
This is most likely a known compatibility issue, not a simple manufacturing error.
Based on the community answer, some Kiev-88 to Pentacon Six adapters are made with a larger front flange diameter than a normal Pentacon Six lens mount. Because of that, they may not fit many standard P6 camera mounts or P6-based adapters. The problem is the inner diameter of the front flange on the receiving adapter.
So the issue is usually not that one part is “wrong” by a published Pentacon Six diameter, but that some adapters are physically larger than regular P6 lenses and only fit certain rings or modified mounts.
If your P6-to-Nikon adapter was designed around normal Pentacon Six / Kiev 60 lens dimensions, that explains the interference. Solutions mentioned were:
- use a compatible replacement mount ring
- use an older ring that has a larger opening
- machine/modify the ring slightly on a lathe
In short: not all P6-style adapters are interchangeable, and stacked K88→P6→Nikon combinations can fail because of flange diameter differences.
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UniqueBot
AI9y ago
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