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10-02-2019, 12:14 PM   #1
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Pentax c-mount 75mm f/1.4

Has anyone used this lens on Q?

---------- Post added 10-02-19 at 11:15 AM ----------

And is it any good? Thoughts on adapting this vs any of the k-mount 75mms?

10-02-2019, 12:57 PM   #2
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C mount registration distance is too short for k mount. It should work on the q, but only with electronic shutter as I recall.
10-02-2019, 01:19 PM   #3
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QuoteOriginally posted by UncleVanya Quote
C mount registration distance is too short for k mount. It should work on the q, but only with electronic shutter as I recall.
Oh sorry you misunderstood me. I meant any thoughts on adapting this to Q mount vs adapting any of the k-mount 75mm lenses to q-mount. So basically on a q body how good is it compared to those on q body
10-02-2019, 01:32 PM   #4
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Often the lens for C mount are sharper in the Q than the lenses think for the full frame camera but I don't have the lens nor a K mount 75mm, my sharpest lens in K mount on the Q are the FA macro 100mm F2.8 and the K 50mm F1.4 but both are not as sharp as the Kern Pailard Yvar 36mm F2.8, the lenses that I have in K mount all have theire best aperture at the one betwin 5.6 and 8 or more close when the one for D and C mount are better more open, probably that is why these lenses are generally sharper.

10-02-2019, 02:10 PM   #5
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Oh interesting
10-02-2019, 03:56 PM   #6
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It is hard to say without knowing exactly what lens you are talking about. Do you have a link to a picture of it?
Some of the c-mount lenses are for machine imaging applications and have limited coverage (and are not easy to use.)
10-02-2019, 08:00 PM   #7
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I would expect only very fine c mount lenses to yield results that rival the q native lenses.

---------- Post added 10-02-19 at 11:04 PM ----------

The comment however about c mount on q outperforming k mount on q isn't hard to buy.

Here's more food for thought. The last part is q centric.

C-Mount Lenses for Mirrorless Micro 4/3 and APS-C?: 6 Steps
10-03-2019, 07:37 PM - 1 Like   #8
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I have a tiny CS lens marked 12megapixel that is pretty much as sharp as a Pentax 02 native lens. Look out for the megapixel count on those C lenses!

10-03-2019, 08:21 PM   #9
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QuoteOriginally posted by 2old4toys Quote
I have a tiny CS lens marked 12megapixel that is pretty much as sharp as a Pentax 02 native lens. Look out for the megapixel count on those C lenses!
Awesome to know.
10-03-2019, 09:51 PM   #10
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Interesting that they test them for megapixel resolving
10-04-2019, 06:16 AM - 1 Like   #11
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QuoteOriginally posted by shaolen Quote
Interesting that they test them for megapixel resolving
I would say they market them according to some claimed megapixel resolving rather than they test them for it.
10-04-2019, 09:06 AM   #12
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QuoteOriginally posted by Mistral75 Quote
I would say they market them according to some claimed megapixel resolving rather than they test them for it.
Interesting
10-04-2019, 04:36 PM   #13
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There is a Navitar 75mm f1.4 on ebay for $32.
10-04-2019, 08:13 PM   #14
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Interesting
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