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Forum: Pentax Camera and Field Accessories 08-26-2020, 09:07 AM  
Pentax Spotmatic Corrective Lens Size
Posted By stephenmcleod
Replies: 9
Views: 1,304
19mm glass lenses (without the black screw part) work with the pentax lens adapter. Screw in lenses (with the black metal screw rim joined on) from Olympus and Nikon F2/F3 do not fit/screw in to the adapter - but the Canon one I mentioned does.

Hope that helps!
Forum: Pentax Camera and Field Accessories 08-24-2020, 04:09 AM  
Pentax Spotmatic Corrective Lens Size
Posted By stephenmcleod
Replies: 9
Views: 1,304
Following up here to err, square the circle, so to speak. Hopefully it will be useful for someone in the future.

1. I got a hold of a Pentax 'corrective lens adapter'. I was searching for Pentax diopters and not turning up much. These essentially allow you to use different screw-in corrective lenses, or lenses without a screw.
2. Olympus 19mm, Nikon F2 and F3 screw-ins do not fit.
3. Canon F1 screw-in lenses work perfectly.
4. You can get 19mm corrective lenses on eBay for fairly cheap which will fit inside the Pentax adaptor.
Forum: Pentax Camera and Field Accessories 08-20-2020, 09:18 AM  
Pentax Spotmatic Corrective Lens Size
Posted By stephenmcleod
Replies: 9
Views: 1,304
Hey all,

I recently picked up a Spotmatic F, and I'm looking about for a diopter solution as I am pretty blind.

I've got the corrective lens adaptor coming, but I'm unsure what size the corrective lenses actually are. I know the originals are basically impossible to find, but my thinking is that I could either cut one out of reading glasses (not mad keen on this idea...) or else I could find a corrective lens for another camera and use that - but obviously it will be size dependent.

Does anyone happen to have the dimensions of the lens for the Spotmatic F/500?

Thank you!

---------- Post added 08-20-20 at 09:40 AM ----------

Ah, found it:

Diopter / correction lens size question - PentaxForums.com

19mm. I thought this was just for the 67, but seems to be the K series.
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