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Forum: Pentax SLR Lens Discussion
03-22-2023, 02:30 AM
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Thank you! Yeah, I was not sure if I can get the whole helicoid clean without disassembly and I was in a rush… bad combo. So the helicoid is seated properly, just the thread distance of the second threaded ring is questionable for me.
And of course I lost the spring of the A setting lever, this tiny, little brass spring. The rest of the parts are non magnetic, so I doubt this one is. I will try again with the vacuum, but otherwise a f2 lens should be rather cheap as a donor body.
But the main issue right now is the proper engagement of the second threaded ring that engages with the helicoid 😵*💫
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Forum: Pentax SLR Lens Discussion
03-21-2023, 12:47 PM
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Hey there!
Unfortunately, I was unable to find any documentation on the 50mm f.14 SMC-A lens. I bought one, but the focus was super loose. So I disassembled it and lubed the helicoid, but not the second threaded section used for focusing gives me trouble putting it back together. Also, the freaking small spring from this small metal part on the rear side when flying off... :/
If anybody has some docmentation or a link to where I can find some instructions, I would be suuuuper greatful!!!
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Forum: Pentax Medium Format
02-01-2020, 12:31 AM
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The focusing screens all come in one part, as the fresnel and the matte screen are taped together. Mine however were taken apart, I don't know why. Possibly to use its fresnel lens with the beattie screen?
However, there should regardless be another part, meaning the glass protection layer on top of that sandwich, and that is what I am missing.
Usually the screen replacement was done by camera technicians, as it requires recalibration of the focus distance of the screen. I think in my Pentax 67 it was a home job and the glass was possibly lost or broken.
Or there was no glass whatsoever, but that is what I am trying to find out :(
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Forum: Pentax Medium Format
01-26-2020, 06:40 AM
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I do intend to stick with the standard screen. My camera did not have the glass protection part, so I made ine out of a picture frame glass. However, now the whole assembly was too thick.
Did the 67 come with only 2 part focusing screen and the 6x7 with the glass part in top???
I am totally confused...
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Forum: Pentax Medium Format
01-20-2020, 02:48 AM
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Does anybody have any experience with Pentax 67 focusing screens?
I got a second focusing screen and fresnel lens with my pentax 67 a beattie intenscreen with split image.
However, when trying to install the beattie screen with the second fresnel lens (which looks a bit weird in itself, having weird circular reflections on it) I get a bright center but a drastic falloff of brightness towards the edges.
With the stock fresnel lens ( i suppose it is the stock) the falloff is even worse.
With the standard focusing screen, image is same brightness all over.
Which way should a fresnel be installed? rough surface towards mirror ur up?
And the beattie instructions that come with the screen says that the original focusing screen comes in 3 parts (matte screen, fresnel and glass), but there is no glass in my 67... neglectable or problem? Also the matte screen and fresnel of the beattie are also separated, should that be?
I would be glad if anyone could help me out here :)
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