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12-26-2020, 04:10 PM   #1
Pentaxian




Join Date: May 2015
Posts: 2,233
smc Pentax Shift 1:3.5 28mm - Servicing movement at dovetail joint

Does anyone have any info about repairing/servicing this lens?

My smc Pentax Shift 1:3.5 28mm has a bit of flex at the point where the moveable bits slide against each other to achieve shift. It doesn't appear to affect IQ but the lens moves noticeably when handling as a sub mm movement at the mount results in a few mm at the front. Sorting it out, if possible, is probably good for the lens in the long term. If feels as if the slack will cause stress and wear.

So this is an unusual lens and I've not managed to find any info what so ever about the innards or how it fits together. I'm pretty sure the lens is a nightmare filled with minuscule springs and ball bearings ready to shoot across the room at the slightest touch of a screw

The affected part is the dovetail joint about 8mm from mount. The only reason I'm even considering repair is that it's so close to the mount. There is however likely to be some complexity even this close to the mount considering the lens ability to rotate.

This post is an initial feeler to see if anyone has any info. I expect good info to take a while to surface. I decided not to post any photos as I guess people knowledgeable will know what I'm referring to.


Last edited by house; 12-26-2020 at 04:32 PM.
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28mm servicing movement, close, info, k-mount, lens, mount, pentax lens, shift, shift 1:3.5 28mm, slr lens, smc, smc pentax shift
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