Lenses mountable on Pentax APS-C bodies?

**Odinz** · 11-11-2013, 02:38 PM

Also, I just remembered that some third party K mount lenses may require the filing down of the flange the protrudes from the back of the lens just inside of the aperture lever. Sometimes these are really long and they can hit the SDM contacts inside of the lens mount preventing you from twisting the lens all of the way on to the camera.

tripodquest · 11-12-2013, 02:10 AM

Originally posted by Odinz

Also, I just remembered that some third party K mount lenses may require the filing down of the flange the protrudes from the back of the lens just inside of the aperture lever. Sometimes these are really long and they can hit the SDM contacts inside of the lens mount preventing you from twisting the lens all of the way on to the camera.

Ok, I'll keep an eye out for that.

tripodquest · 11-12-2013, 02:15 AM

Originally posted by vonBaloney

Adaptall should read "no optics" as their Pentax adapters make them just like any native lens, and with a PKA adapter you even get aperture control from the body, full metering, etc.

T-mount: a proper T-mount should allow those lenses to be used just like an m42 -- no optics, infinity focus yes.

Minolta: I think there are Minolta to m42 adapters, so you could do it that way. You'd definitely lose infinity.

I updated the list with your comments.

Originally posted by vonBaloney

Probably wouldn't on any of the APS-C digital bodies, only full-frame film SLRs. There are a couple Yashinon-DX models to look out for also, but that is very very rare. Most m42s are fine.

If there aren't many to look out for, can you list the ones to look out for (if you remember them)?

elliott · 11-12-2013, 02:23 AM

Originally posted by tripodquest

If there aren't many to look out for, can you list the ones to look out for (if you remember them)?

The only one I know of is the Yashinon 21mm f3.3, it is quite unique and very rare.

tripodquest · 11-12-2013, 02:25 AM

Originally posted by elliott

The only one I know of is the Yashinon 21mm f3.3, it is quite unique and very rare.

okay, thank you. I'm always on the lookout for rare lenses and that sounds exactly like something I might have bought if I found it so thank you. Your information isn't wasted. Do you happen to know if Arri lenses (in Arri mount) can be adapted to Pentax aps-c? I couldn't find any adapters so far

elliott · 11-12-2013, 02:39 AM

Originally posted by tripodquest

okay, thank you. I'm always on the lookout for rare lenses and that sounds exactly like something I might have bought if I found it so thank you.

If you do find one and the price is reasonable, buy it anyway and pick up a used K-01, it will work fine on that body.

Review by konraDarnok:
http://imgur.com/a/TCRG0

tripodquest · 11-12-2013, 02:48 AM

Originally posted by elliott

If you do find one and the price is reasonable, buy it anyway and pick up a used K-01, it will work fine on that body.

Review by konraDarnok:
Yashinon-DX 1:3.3 f=21mm Yashica - Imgur

the purple vignetting really bothers me but some of the pictures also looked interesting, it might make a good lens for some situations when you want a different "feel" for the image

vonBaloney · 11-12-2013, 08:46 AM

The Yashinon 21mm is a very rare and bizarre lens -- don't think it fits in ANY camera without mirror lock-up being used -- it has a special attachment.

I was talking about the common Yashinon-DX 50/1.4 and 50/1.7 (only the DX versions) -- at infinity the rear sticks out more than any other lens I know of. (I'd never heard about the Isco Westromat linked above, nor had one, but they are much less common anyway.) So the Yashinons are *probably* fine on any of the Pentax APS-C SLR bodies but at infinity might just graze the mirror. I've used them on the K10D, the K-7, and the K-5 with no trouble, but I have heard a few people saying the mirror hit them on their K20Ds. (No damage is likely, as long as you don't keep doing it.) They would not work with a full-frame mirror, no way (except on the original Yashinon film body they were designed for -- they don't even work on later Yashinons).

I thought the K-01 might be a good option for these, but without the prism box, there is no open area at the top so if you go to infinity in starts screwing into the inner frame of the camera. So they are actually more dangerous to the K-01.

thornburg · 11-12-2013, 09:32 AM

Originally posted by vonBaloney

The Yashinon 21mm is a very rare and bizarre lens -- don't think it fits in ANY camera without mirror lock-up being used -- it has a special attachment.

I was talking about the common Yashinon-DX 50/1.4 and 50/1.7 (only the DX versions) -- at infinity the rear sticks out more than any other lens I know of. (I'd never heard about the Isco Westromat linked above, nor had one, but they are much less common anyway.) So the Yashinons are *probably* fine on any of the Pentax APS-C SLR bodies but at infinity might just graze the mirror. I've used them on the K10D, the K-7, and the K-5 with no trouble, but I have heard a few people saying the mirror hit them on their K20Ds. (No damage is likely, as long as you don't keep doing it.) They would not work with a full-frame mirror, no way (except on the original Yashinon film body they were designed for -- they don't even work on later Yashinons).

I thought the K-01 might be a good option for these, but without the prism box, there is no open area at the top so if you go to infinity in starts screwing into the inner frame of the camera. So they are actually more dangerous to the K-01.

I can test both of these lenses on a K-x and/or K30, if people are interested. Of course there are different versions even within the DX line, so it isn't a catch-all.

Oddly, I've had Yashinon lenses that fouled the mirror of some Yashica m42 film SLRs. It's a little bit crazy.

They really do produce nice images, though.

elliott · 11-12-2013, 09:43 AM

I never had a problem with my Yashinon DX 50mm f1.7. I don't have it anymore, but I'm pretty sure the rear element at infinity protruded more than the aperture pin, which is uncommon in M42 lenses.

Some that had problems might have had the rear group unscrewed slightly or it was misadjusted in some way.

vonBaloney · 11-12-2013, 10:09 AM

Originally posted by thornburg

Oddly, I've had Yashinon lenses that fouled the mirror of some Yashica m42 film SLRs. It's a little bit crazy.

Yes, it even warns about them in the manual of the later Yashinon bodies. The ones I'm referring to are the DX "auto" models, although the non-auto ones may be the same -- I didn't even know any existed until recently, never seen one in person.

thornburg · 11-12-2013, 06:39 PM

Originally posted by vonBaloney

Yes, it even warns about them in the manual of the later Yashinon bodies. The ones I'm referring to are the DX "auto" models, although the non-auto ones may be the same -- I didn't even know any existed until recently, never seen one in person.

That's funny. I'm a bit of a Yashica collector, so I actually own a few Yashica camera manuals, but I must admit, I've never read any of them! (Aside from the part where it tells you which incredibly rare battery you need).

stevebrot · 12-09-2013, 03:10 PM

Originally posted by lytrytyr

Some M42 lenses may foul some Pentax APS-C DSLR body mirrors
when focused at infinity:

Amazing that they worked just fine with the same registration distance and the much larger/longer mirrors found in cameras such as the Pentax Spotmatic*.

Steve

*simple fabric hinge...no articulated mirror travel...

lytrytyr · 12-09-2013, 07:20 PM

Originally posted by stevebrot

Amazing that they worked just fine with the same registration distance and the much larger/longer mirrors found in cameras such as the Pentax Spotmatic.

Amazing? Maybe. But true? Not necessarily.

Case in point, my Isco Westromat 35/2.8 wouldn't play nice with my Spotmatic.

For reports of this lens fouling a K-7 and an H3v, check the 7 Nov. 2011, 11:29 pm post on

Isco G

stevebrot · 12-09-2013, 08:32 PM

Originally posted by lytrytyr

Case in point, my Isco Westromat 35/2.8 wouldn't play nice with my Spotmatic.

For reports of this lens fouling a K-7 and an H3v, check the 7 Nov. 2011, 11:29 pm post on

Isco G

I would not find interference with an H3v surprising at all. It was not unusual back in the day to have a lens that would fail to clear the mirror on a camera with a reasonable length mirror (required to avoid top margin black-out with telephoto lenses). I would, however, find it very surprising on an APS-C camera since the mirror should be only about 2/3 as long. That being said, I am not willing to call the two MF Forum user liars.

Along with the K-7, the thread also mentions problems with the K20D with that lens. What is even more puzzling is that there is another thread on MF Forum where a user posts photos from the same lens taken with a Sony A700 FF.

So, when in doubt, do a little visual comparison. Looking at the K10D...Looking at the SV (same as H3v). Now if that is not strange. The leading edge of the mirror on both cameras is about the same depth from the lens flange when raised. The mirror on the K10D (and presumably other Pentax dSLRs is outsized on the short axis.

Dang. Something new to remember...

Steve

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Hyperfocal Scale on APS-C	godwinaustin	Photographic Technique	21	01-25-2013 03:16 PM
Thoughts on APS-C cameras	mysticcowboy	Pentax DSLR Discussion	64	09-30-2012 01:22 PM
Pentax APS-C Lenses Prices and Reviews	rm2	Pentax SLR Lens Discussion	9	11-15-2010 01:41 AM
Tilt shift lenses made for Pentax APS-C bodies	Buckeye	Troubleshooting and Beginner Help	5	11-12-2010 07:43 AM
645 lenses on APS-C	axl	Pentax SLR Lens Discussion	2	06-11-2009 11:59 PM

11-11-2013, 02:38 PM	#16
Odinz Loyal Site Supporter Join Date: Jan 2008 Location: Virginia, USA Photos: Albums Posts: 259	Also, I just remembered that some third party K mount lenses may require the filing down of the flange the protrudes from the back of the lens just inside of the aperture lever. Sometimes these are really long and they can hit the SDM contacts inside of the lens mount preventing you from twisting the lens all of the way on to the camera.

11-12-2013, 02:10 AM	#17
tripodquest Inactive Account Join Date: Oct 2013 Posts: 249 Original Poster	Originally posted by Odinz Also, I just remembered that some third party K mount lenses may require the filing down of the flange the protrudes from the back of the lens just inside of the aperture lever. Sometimes these are really long and they can hit the SDM contacts inside of the lens mount preventing you from twisting the lens all of the way on to the camera. Ok, I'll keep an eye out for that.

11-12-2013, 02:15 AM	#18
tripodquest Inactive Account Join Date: Oct 2013 Posts: 249 Original Poster	Originally posted by vonBaloney Adaptall should read "no optics" as their Pentax adapters make them just like any native lens, and with a PKA adapter you even get aperture control from the body, full metering, etc. T-mount: a proper T-mount should allow those lenses to be used just like an m42 -- no optics, infinity focus yes. Minolta: I think there are Minolta to m42 adapters, so you could do it that way. You'd definitely lose infinity. I updated the list with your comments. Originally posted by vonBaloney Probably wouldn't on any of the APS-C digital bodies, only full-frame film SLRs. There are a couple Yashinon-DX models to look out for also, but that is very very rare. Most m42s are fine. If there aren't many to look out for, can you list the ones to look out for (if you remember them)?

11-12-2013, 02:23 AM	#19
elliott Inactive Account Join Date: Dec 2008 Location: North Carolina Photos: Albums Posts: 1,720	Originally posted by tripodquest If there aren't many to look out for, can you list the ones to look out for (if you remember them)? The only one I know of is the Yashinon 21mm f3.3, it is quite unique and very rare.

11-12-2013, 02:25 AM	#20
tripodquest Inactive Account Join Date: Oct 2013 Posts: 249 Original Poster	Originally posted by elliott The only one I know of is the Yashinon 21mm f3.3, it is quite unique and very rare. okay, thank you. I'm always on the lookout for rare lenses and that sounds exactly like something I might have bought if I found it so thank you. Your information isn't wasted. Do you happen to know if Arri lenses (in Arri mount) can be adapted to Pentax aps-c? I couldn't find any adapters so far

11-12-2013, 02:39 AM	#21
elliott Inactive Account Join Date: Dec 2008 Location: North Carolina Photos: Albums Posts: 1,720	Originally posted by tripodquest okay, thank you. I'm always on the lookout for rare lenses and that sounds exactly like something I might have bought if I found it so thank you. If you do find one and the price is reasonable, buy it anyway and pick up a used K-01, it will work fine on that body. Review by konraDarnok: http://imgur.com/a/TCRG0

11-12-2013, 02:48 AM	#22
tripodquest Inactive Account Join Date: Oct 2013 Posts: 249 Original Poster	Originally posted by elliott If you do find one and the price is reasonable, buy it anyway and pick up a used K-01, it will work fine on that body. Review by konraDarnok: Yashinon-DX 1:3.3 f=21mm Yashica - Imgur the purple vignetting really bothers me but some of the pictures also looked interesting, it might make a good lens for some situations when you want a different "feel" for the image

11-12-2013, 08:46 AM	#23
vonBaloney Pentaxian Join Date: Oct 2011 Location: Albuquerque, NM Posts: 6,029	The Yashinon 21mm is a very rare and bizarre lens -- don't think it fits in ANY camera without mirror lock-up being used -- it has a special attachment. I was talking about the common Yashinon-DX 50/1.4 and 50/1.7 (only the DX versions) -- at infinity the rear sticks out more than any other lens I know of. (I'd never heard about the Isco Westromat linked above, nor had one, but they are much less common anyway.) So the Yashinons are probably fine on any of the Pentax APS-C SLR bodies but at infinity might just graze the mirror. I've used them on the K10D, the K-7, and the K-5 with no trouble, but I have heard a few people saying the mirror hit them on their K20Ds. (No damage is likely, as long as you don't keep doing it.) They would not work with a full-frame mirror, no way (except on the original Yashinon film body they were designed for -- they don't even work on later Yashinons). I thought the K-01 might be a good option for these, but without the prism box, there is no open area at the top so if you go to infinity in starts screwing into the inner frame of the camera. So they are actually more dangerous to the K-01.

11-12-2013, 09:32 AM	#24
thornburg Senior Member Join Date: Aug 2012 Location: Doylestown, PA Posts: 200	Originally posted by vonBaloney The Yashinon 21mm is a very rare and bizarre lens -- don't think it fits in ANY camera without mirror lock-up being used -- it has a special attachment. I was talking about the common Yashinon-DX 50/1.4 and 50/1.7 (only the DX versions) -- at infinity the rear sticks out more than any other lens I know of. (I'd never heard about the Isco Westromat linked above, nor had one, but they are much less common anyway.) So the Yashinons are probably fine on any of the Pentax APS-C SLR bodies but at infinity might just graze the mirror. I've used them on the K10D, the K-7, and the K-5 with no trouble, but I have heard a few people saying the mirror hit them on their K20Ds. (No damage is likely, as long as you don't keep doing it.) They would not work with a full-frame mirror, no way (except on the original Yashinon film body they were designed for -- they don't even work on later Yashinons). I thought the K-01 might be a good option for these, but without the prism box, there is no open area at the top so if you go to infinity in starts screwing into the inner frame of the camera. So they are actually more dangerous to the K-01. I can test both of these lenses on a K-x and/or K30, if people are interested. Of course there are different versions even within the DX line, so it isn't a catch-all. Oddly, I've had Yashinon lenses that fouled the mirror of some Yashica m42 film SLRs. It's a little bit crazy. They really do produce nice images, though.

11-12-2013, 09:43 AM	#25
elliott Inactive Account Join Date: Dec 2008 Location: North Carolina Photos: Albums Posts: 1,720	I never had a problem with my Yashinon DX 50mm f1.7. I don't have it anymore, but I'm pretty sure the rear element at infinity protruded more than the aperture pin, which is uncommon in M42 lenses. Some that had problems might have had the rear group unscrewed slightly or it was misadjusted in some way.

Thread Tools	Search this Thread
	Search this Thread: Advanced Search

11-12-2013, 10:09 AM	#26
vonBaloney Pentaxian Join Date: Oct 2011 Location: Albuquerque, NM Posts: 6,029	Originally posted by thornburg Oddly, I've had Yashinon lenses that fouled the mirror of some Yashica m42 film SLRs. It's a little bit crazy. Yes, it even warns about them in the manual of the later Yashinon bodies. The ones I'm referring to are the DX "auto" models, although the non-auto ones may be the same -- I didn't even know any existed until recently, never seen one in person.

11-12-2013, 06:39 PM	#27
thornburg Senior Member Join Date: Aug 2012 Location: Doylestown, PA Posts: 200	Originally posted by vonBaloney Yes, it even warns about them in the manual of the later Yashinon bodies. The ones I'm referring to are the DX "auto" models, although the non-auto ones may be the same -- I didn't even know any existed until recently, never seen one in person. That's funny. I'm a bit of a Yashica collector, so I actually own a few Yashica camera manuals, but I must admit, I've never read any of them! (Aside from the part where it tells you which incredibly rare battery you need).

12-09-2013, 03:10 PM	#28
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by lytrytyr Some M42 lenses may foul some Pentax APS-C DSLR body mirrors when focused at infinity: Amazing that they worked just fine with the same registration distance and the much larger/longer mirrors found in cameras such as the Pentax Spotmatic. Steve simple fabric hinge...no articulated mirror travel...

12-09-2013, 07:20 PM	#29
lytrytyr Pentaxian Join Date: Nov 2011 Photos: Gallery \| Albums Posts: 4,310	Originally posted by stevebrot Amazing that they worked just fine with the same registration distance and the much larger/longer mirrors found in cameras such as the Pentax Spotmatic. Amazing? Maybe. But true? Not necessarily. Case in point, my Isco Westromat 35/2.8 wouldn't play nice with my Spotmatic. For reports of this lens fouling a K-7 and an H3v, check the 7 Nov. 2011, 11:29 pm post on Isco G

12-09-2013, 08:32 PM	#30
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by lytrytyr Case in point, my Isco Westromat 35/2.8 wouldn't play nice with my Spotmatic. For reports of this lens fouling a K-7 and an H3v, check the 7 Nov. 2011, 11:29 pm post on Isco G I would not find interference with an H3v surprising at all. It was not unusual back in the day to have a lens that would fail to clear the mirror on a camera with a reasonable length mirror (required to avoid top margin black-out with telephoto lenses). I would, however, find it very surprising on an APS-C camera since the mirror should be only about 2/3 as long. That being said, I am not willing to call the two MF Forum user liars. Along with the K-7, the thread also mentions problems with the K20D with that lens. What is even more puzzling is that there is another thread on MF Forum where a user posts photos from the same lens taken with a Sony A700 FF. So, when in doubt, do a little visual comparison. Looking at the K10D...Looking at the SV (same as H3v). Now if that is not strange. The leading edge of the mirror on both cameras is about the same depth from the lens flange when raised. The mirror on the K10D (and presumably other Pentax dSLRs is outsized on the short axis. Dang. Something new to remember... Steve