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Forum: Pentax SLR Lens Discussion 04-14-2018, 09:58 AM  
Adapting Altix lenses to Pentax K using an M42 adapter
Posted By THoog
Replies: 6
Views: 1,314
I don't have any direct experience, but from what I've read on other forums, it appears that the Altix lens locking mechanism is actually in front of the flange. Putting an M42 adapter ring hard against the lens body is effectively recessing the lens a few millimeters into the camera body, which may be enough to get infinity focus. On some Altix-mount lenses, there is a risk of the mirror hitting the rear of the lens.
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