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Forum: Pentax SLR Lens Discussion
07-23-2016, 06:12 PM
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Yeah, reading those numbers is kind of tricky.
If you use either the official Pentax one, such as the ones mikeSF is selling on the PF Marketplace
https://www.pentaxforums.com/forums/24-photographic-equipment-sale/326400-sal...ml#post3719457
or even a modern Chinese copy, it should work as it did when new. When we visited Henry Ford's "Greenfield Village" in May, I disciplined myself to use only an M42-mount lens all day {I have a Chinese adapter ring}, and except with having to work at focusing, using that lens was just like using a comparable K-mount lens.
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Forum: Pentax SLR Lens Discussion
07-23-2016, 08:50 AM
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This was my original thought, also .... but then I thought, "Why trust years of Pentax engineering when I can actually look for myself?", so I took the lens off my K-30 {currently my only working K-mount camera}, turned it on, and put it into LV mode {which has the effect of lifting the mirror}. When fully lifted, the mirror comes out to the ridge I marked with an orange arrow; it occurs to me that those clever Pentax engineers designed the camera so that ridge would prevent a lens from protruding into where the mirror could hit it, but then I took some measurements; the ridge is approximately 5mm from the mount edge, and my Super Tak 50mm lens protrudes 4mm behind the mount when focused at infinity, so I guess this is safe enough.
{and I'm guessing that all recent consumer-level Pentax cameras - including the K-S1 - use the same mirror-box design; engineers tend to be conservative, which means, amongst other things, not redesigning something which meets current needs}
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