Fotodiox x Novoflex x Voigtlander: M-mount adapter cagematch

Started Nov 19, 2013 | Discussions thread
Senior MemberPosts: 1,715
Re: Fotodiox x Novoflex x Voigtlander: M-mount adapter cagematch
In reply to Tom Caldwell, Nov 20, 2013

Tom Caldwell wrote:

If the adapter focuses slightly before infinity then this is designed in and not a manufacturing fault. The manufacturer does this as a deliberate act as they cannot pre-determine every faulty focus lens that might be used on them.

I think this is not so clear. There is certainly a specific distance that it should be machined to. Some manufacturers say you should hit infinity focus at the infinity stop -- others say you may focus past infinity.

If you ask Voightllander, they will tell you theirs should stop at infinity focus -- and if you tell them it doesn't, they'll tell you to bring it back to where you purchased.

Also, I don't see why an adapter manufacturer should intentionally build a shot adapter just because a lens mounted on it might be long.

I found this post informative:

Specifically, the issue regarding 9.80 mm vs. 9.72 mm -- but perhaps his measuring tool was off?

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