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05-11-2021, 05:20 PM   #16
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It's worth pointing out that my QDOS version also had a Ricoh pin as well as the KA mount.

05-11-2021, 06:31 PM   #17
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QuoteOriginally posted by johnha Quote
It's worth pointing out that my QDOS version also had a Ricoh pin as well as the KA mount.



QuoteQuote:
Third Party Variants of the K-mount
Pentax made the original "K" mount available for other camera manufacturers to adopt. The goal was to create a universal standard bayonet mount much like the M42 screw mount had been. Ricoh, Chinon, and others produced cameras and lenses with the "K" mount. Unfortunately, with the introduction of the "KA" mount, Pentax reversed the decision with the result that the other manufacturers either abandoned the "K" mount or developed their own, somewhat incompatible, enhancements. Several third party lens manufacturers produce or has produced lenses with a K-mount. There are no issues with current third party lenses in K-mount, but for older lenses there are two traps to watch out for:

The infamous "Ricoh pin". Where Pentax created the "KA" mount in order to support Program and Tv exposure automation, Ricoh had to create their own variant, which has a protruding pin placed in a somewhat unfortunate location, namely in the exact spot where Pentax years later placed the autofocus drive shaft. Such a Ricoh lens will get stuck when mounted on a Pentax autofocus body - the Ricoh pin will get lodged in the drive shaft and prevent the lens from being removed without deployment of finesse, patience and tools.. . .
Read more at: https://www.pentaxforums.com/articles/photo-articles/evolution-of-pentax-k-m...#ixzz6ubtnMBTj
05-12-2021, 01:16 AM   #18
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Which reminds me of the super slow aperture blades of my Komine version.... That also has a Ricoh pin, but nothing to worry about. Only some crappy cheap third party glass has a Ricoh pin that will catch. It needs to be rounded and receded. If it is squared of don't use the lens or try to remove the pin (without loosing the a contact or the little aperture ball bearing .)
05-12-2021, 03:07 AM   #19
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QuoteOriginally posted by D1N0 Quote
Which reminds me of the super slow aperture blades of my Komine version.... That also has a Ricoh pin, but nothing to worry about. Only some crappy cheap third party glass has a Ricoh pin that will catch. It needs to be rounded and receded. If it is squared of don't use the lens or try to remove the pin (without loosing the a contact or the little aperture ball bearing .)
Komine version with super slow aperture blades here... is there a solution? With film cameras isn't a problem but with the K-1 is unusable

05-12-2021, 03:21 AM   #20
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I just tested this morning my second Series 1, it's the 2nd gen made by Tokina f3.5, and indeed, its IQ is awesome, even at 70 or 210mm, just as a good prime lens !
10/10 Bokeh, 10/10 sharpness, no CA at all, light reflects make a soft 6 branch star.
It has a 6 blades diaph. but the blades are well curved so the bokeh is huge !
Maybe mine needs a little infinity focus calibration, or I shall test again higher than f8...
I'll keep both, one for easier handling (the cosina) and the Tokina for super IQ photos
05-12-2021, 04:19 AM   #21
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@D1N0, @ Andrea K
see my fix of the komine 70-210mm blades:

Vivitar (komine) 70-210mm, PK-A mount, sticky iris repair. - PentaxForums.com
05-12-2021, 12:54 PM   #22
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added to the index as version 4 (Cosina)

05-12-2021, 02:24 PM - 1 Like   #23
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QuoteOriginally posted by D1N0 Quote
Only some crappy cheap third party glass has a Ricoh pin that will catch.
...or some Ricoh Rikenon-P and not-so-cheap third-party lenses from before Pentax released its KAF bodies. The "safe" versions of the Ricoh pin are found on lenses that date to sometime after the debut of Pentax AF cameras in 1987, when the incompatibility became obvious. (The pin itself dates to 1984.)

Added: The "safe" version is a spring-loaded ball-type contact. Any that look like a pin (rounded or not) should be assumed to be unsafe.


Steve

Last edited by stevebrot; 05-12-2021 at 02:30 PM.
05-13-2021, 03:27 AM   #24
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QuoteOriginally posted by marcusBMG Quote
@D1N0, @ Andrea K
see my fix of the komine 70-210mm blades:

Vivitar (komine) 70-210mm, PK-A mount, sticky iris repair. - PentaxForums.com
Without the Brexit and his customs fees I would have sent it to you ...
05-13-2021, 04:34 AM   #25
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QuoteOriginally posted by marcusBMG Quote
@D1N0, @ Andrea K
see my fix of the komine 70-210mm blades:

Vivitar (komine) 70-210mm, PK-A mount, sticky iris repair. - PentaxForums.com
Thanks. I already had it stored as a project, but I always fear I will just totally mess it up. It seems to have gotten even worse now it is not just slow but practically stuck. Only manually handling the lever will make it close.
05-13-2021, 06:09 AM   #26
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I'll coach you over zoom... Just have to take a deep breath and get stuck in. it was the same with the vivitar komine 400mm I had in my box for ages. When i finally did it it was easy.

Look around for a camera/lens techie, I'm sure there must be one who can look at the online ino and go yeah no prob, Andrea.

Last edited by marcusBMG; 05-13-2021 at 06:14 AM.
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