Pentax c-mount 75mm f/1.4

shaolen · 10-02-2019, 12:14 PM

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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?

**UncleVanya** · 10-02-2019, 12:57 PM

C mount registration distance is too short for k mount. It should work on the q, but only with electronic shutter as I recall.

shaolen · 10-02-2019, 01:19 PM

Originally posted by UncleVanya

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

**S.M.** · 10-02-2019, 01:32 PM

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.

shaolen · 10-02-2019, 02:10 PM

Oh interesting

Unregistered User · 10-02-2019, 03:56 PM

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.)

**UncleVanya** · 10-02-2019, 08:00 PM

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

2old4toys · 10-03-2019, 07:37 PM - **1 Like**

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!

**UncleVanya** · 10-03-2019, 08:21 PM

Originally posted by 2old4toys

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.

shaolen · 10-03-2019, 09:51 PM

Interesting that they test them for megapixel resolving

Mistral75 · 10-04-2019, 06:16 AM - **1 Like**

Originally posted by shaolen

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.

shaolen · 10-04-2019, 09:06 AM

Originally posted by Mistral75

I would say they market them according to some claimed megapixel resolving rather than they test them for it.

Interesting

Unregistered User · 10-04-2019, 04:36 PM

There is a Navitar 75mm f1.4 on ebay for $32.

shaolen · 10-04-2019, 08:13 PM

Interesting

10-02-2019, 12:14 PM	#1
shaolen Veteran Member Join Date: May 2012 Location: Phoenix AZ Posts: 1,047	Pentax c-mount 75mm f/1.4 Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here. 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?

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10-02-2019, 12:57 PM	#2
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,454	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
shaolen Veteran Member Join Date: May 2012 Location: Phoenix AZ Posts: 1,047 Original Poster	Originally posted by UncleVanya 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
S.M. Site Supporter Join Date: Mar 2019 Location: Merano (BZ) Photos: Gallery \| Albums Posts: 109	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
shaolen Veteran Member Join Date: May 2012 Location: Phoenix AZ Posts: 1,047 Original Poster	Oh interesting

10-02-2019, 03:56 PM	#6
Unregistered User Guest	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
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,454	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
2old4toys Pentaxian Join Date: Jan 2018 Posts: 391	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
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,454	Originally posted by 2old4toys 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
shaolen Veteran Member Join Date: May 2012 Location: Phoenix AZ Posts: 1,047 Original Poster	Interesting that they test them for megapixel resolving

10-04-2019, 06:16 AM - 1 Like	#11
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	Originally posted by shaolen 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
shaolen Veteran Member Join Date: May 2012 Location: Phoenix AZ Posts: 1,047 Original Poster	Originally posted by Mistral75 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
Unregistered User Guest	There is a Navitar 75mm f1.4 on ebay for $32.

10-04-2019, 08:13 PM	#14
shaolen Veteran Member Join Date: May 2012 Location: Phoenix AZ Posts: 1,047 Original Poster	Interesting