Do any Pentax K mount lenses cover crop digital medium format?

**barondla** · 01-08-2021, 10:29 AM

Some FF Canon EOS lenses cover digital crop medium format. Fuji even recommends using these lenses on their camera. So do any of the Pentax K mounts cover medium format?

Obviously, they wouldn't focus to infinity on the Pentax 645D/Z. But, would they cover on a mirrorless body?
Thanks,
barondla

texandrews · 01-08-2021, 11:01 AM - **1 Like**

Well, for crop frame medium format the one that comes immediately to mind would be the 28 shift. A rare bird.

zapp · 01-08-2021, 11:05 AM

Typically shift lenses designed for 35mm cameras can be used on cameras with larger sensors.
Anything below 50mm will probably not work by design, unless it is a shift or PC lens. So the 28mm shift lens would work anything else is trial and error. Above 50mm there s typically no immediate physical limit to the image circle, so you may get an image, but vignetting and quality fall off towards the edges can be extreme - and improve then closing aperture.

stevebrot · 01-08-2021, 12:37 PM

Originally posted by barondla

Obviously, they wouldn't focus to infinity on the Pentax 645D/Z. But, would they cover on a mirrorless body?

They will have the same image circle on Fuji-G as on Pentax K. The minimum image circle diameter would be 55mm for Fuji-G. Out curiosity, what Canon lenses were suggested by Fuji? Tilt/shift?

Steve

**UncleVanya** · 01-08-2021, 01:22 PM

Originally posted by stevebrot

They will have the same image circle on Fuji-G as on Pentax K. The minimum image circle diameter would be 55mm for Fuji-G. Out curiosity, what Canon lenses were suggested by Fuji? Tilt/shift?

Steve

I’m not finding anything outside these adapters which don’t require native image circle to cover larger than standard ef expected size:

Mount any Canon EF lens to Fujifilm's GFX cameras with Metabones new EF-GFX Smart Expander adapters

Fotodiox Canon to FUJIFILM GFX Autofocus Adapter with Variable ND - Newsshooter

stevebrot · 01-08-2021, 01:48 PM

Originally posted by UncleVanya

I’m not finding anything outside these adapters which don’t require native image circle to cover larger than standard ef expected size:

I am referring to the assertion in the original post.

Steve

**UncleVanya** · 01-08-2021, 02:05 PM

Originally posted by stevebrot

I am referring to the assertion in the original post.

Steve

Yes. I get that. I’m saying I’m unable to find any references like the op mentioned. Other than via these adapters. It is absolutely possible that these new adapters make searching for the data harder and masks the list. I’m interested in the answer but can’t find anything so far.

stevebrot · 01-08-2021, 02:21 PM - **1 Like**

Originally posted by UncleVanya

Yes. I get that. I’m saying I’m unable to find any references like the op mentioned. Other than via these adapters. It is absolutely possible that these new adapters make searching for the data harder and masks the list. I’m interested in the answer but can’t find anything so far.

Got it...

On a hunch I did a search on DuckDuckG (fuji gfx canon lens) and found numerous references to use of Canon lenses using glassless adapters. Apparently image circle is adequate for many normal and telephoto primes, but less so for wide angles.

Best lenses for Canon EF on Fuji GFX 100: Medium Format Talk Forum: Digital Photography Review

35mm Lenses on the Fujifilm GFX 50S | AKPO (This one is probably the better of the two.)

Steve

**UncleVanya** · 01-08-2021, 02:24 PM

Originally posted by stevebrot

Got it...

On a hunch I did a search on DuckDuckG (fuji gfx canon lens) and found numerous references to use of Canon lenses using glassless adapters. Apparently image circle is adequate for many normal and telephoto primes, but less so for wide angles.

Best lenses for Canon EF on Fuji GFX 100: Medium Format Talk Forum: Digital Photography Review

35mm Lenses on the Fujifilm GFX 50S | AKPO (This one is probably the better of the two.)

Steve

Ah! Thanks. I was mired in the adapter searches. I couldn’t find my way out!

**barondla** · 01-08-2021, 02:26 PM

Originally posted by stevebrot

Got it...

On a hunch I did a search on DuckDuckG (fuji gfx canon lens) and found numerous references to use of Canon lenses using glassless adapters. Apparently image circle is adequate for many normal and telephoto primes, but less so for wide angles.

Best lenses for Canon EF on Fuji GFX 100: Medium Format Talk Forum: Digital Photography Review

35mm Lenses on the Fujifilm GFX 50S | AKPO (This one is probably the better of the two.)

Steve

This is one of the lists I saw. 35 f 1.4 is amazing!

Thanks,
barondla

Medex · 01-08-2021, 02:54 PM - **1 Like**

DFA* 85/1.4 covers definitely 44x33 mm sensor. Some pictures were shot with this lens and Fuji GFX

**kaseki** · 01-09-2021, 06:41 AM

I vaguely recall that if one wants a fast wide-angle lens with a flat field (for corner focus) and telecentric focus (to minimize brightness fall-off vignetting due to ray angles), a correction lens is needed close to the focal plane. This would seem to require a mirrorless configuration.

The alternative is panning and stitching.

01-08-2021, 10:29 AM	#1
barondla Site Supporter Join Date: Sep 2006 Location: midwest, United States Photos: Gallery \| Albums Posts: 5,714	Do any Pentax K mount lenses cover crop digital medium format? Some FF Canon EOS lenses cover digital crop medium format. Fuji even recommends using these lenses on their camera. So do any of the Pentax K mounts cover medium format? Obviously, they wouldn't focus to infinity on the Pentax 645D/Z. But, would they cover on a mirrorless body? Thanks, barondla

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01-08-2021, 11:01 AM - 1 Like	#2
texandrews Moderator Join Date: Apr 2014 Location: Baltimore Photos: Albums Posts: 3,390	Well, for crop frame medium format the one that comes immediately to mind would be the 28 shift. A rare bird.

01-08-2021, 11:05 AM	#3
zapp Pentaxian Join Date: Jul 2011 Posts: 2,385	Typically shift lenses designed for 35mm cameras can be used on cameras with larger sensors. Anything below 50mm will probably not work by design, unless it is a shift or PC lens. So the 28mm shift lens would work anything else is trial and error. Above 50mm there s typically no immediate physical limit to the image circle, so you may get an image, but vignetting and quality fall off towards the edges can be extreme - and improve then closing aperture.

01-08-2021, 12:37 PM	#4
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by barondla Obviously, they wouldn't focus to infinity on the Pentax 645D/Z. But, would they cover on a mirrorless body? They will have the same image circle on Fuji-G as on Pentax K. The minimum image circle diameter would be 55mm for Fuji-G. Out curiosity, what Canon lenses were suggested by Fuji? Tilt/shift? Steve

01-08-2021, 01:22 PM	#5
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,400	Originally posted by stevebrot They will have the same image circle on Fuji-G as on Pentax K. The minimum image circle diameter would be 55mm for Fuji-G. Out curiosity, what Canon lenses were suggested by Fuji? Tilt/shift? Steve I’m not finding anything outside these adapters which don’t require native image circle to cover larger than standard ef expected size: Mount any Canon EF lens to Fujifilm's GFX cameras with Metabones new EF-GFX Smart Expander adapters Fotodiox Canon to FUJIFILM GFX Autofocus Adapter with Variable ND - Newsshooter

01-08-2021, 01:48 PM	#6
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by UncleVanya I’m not finding anything outside these adapters which don’t require native image circle to cover larger than standard ef expected size: I am referring to the assertion in the original post. Steve

01-08-2021, 02:05 PM	#7
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,400	Originally posted by stevebrot I am referring to the assertion in the original post. Steve Yes. I get that. I’m saying I’m unable to find any references like the op mentioned. Other than via these adapters. It is absolutely possible that these new adapters make searching for the data harder and masks the list. I’m interested in the answer but can’t find anything so far.

01-08-2021, 02:21 PM - 1 Like	#8
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by UncleVanya Yes. I get that. I’m saying I’m unable to find any references like the op mentioned. Other than via these adapters. It is absolutely possible that these new adapters make searching for the data harder and masks the list. I’m interested in the answer but can’t find anything so far. Got it... On a hunch I did a search on DuckDuckG (fuji gfx canon lens) and found numerous references to use of Canon lenses using glassless adapters. Apparently image circle is adequate for many normal and telephoto primes, but less so for wide angles. Best lenses for Canon EF on Fuji GFX 100: Medium Format Talk Forum: Digital Photography Review 35mm Lenses on the Fujifilm GFX 50S \| AKPO (This one is probably the better of the two.) Steve

01-08-2021, 02:24 PM	#9
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,400	Originally posted by stevebrot Got it... On a hunch I did a search on DuckDuckG (fuji gfx canon lens) and found numerous references to use of Canon lenses using glassless adapters. Apparently image circle is adequate for many normal and telephoto primes, but less so for wide angles. Best lenses for Canon EF on Fuji GFX 100: Medium Format Talk Forum: Digital Photography Review 35mm Lenses on the Fujifilm GFX 50S \| AKPO (This one is probably the better of the two.) Steve Ah! Thanks. I was mired in the adapter searches. I couldn’t find my way out!

01-08-2021, 02:26 PM	#10
barondla Site Supporter Join Date: Sep 2006 Location: midwest, United States Photos: Gallery \| Albums Posts: 5,714 Original Poster	Originally posted by stevebrot Got it... On a hunch I did a search on DuckDuckG (fuji gfx canon lens) and found numerous references to use of Canon lenses using glassless adapters. Apparently image circle is adequate for many normal and telephoto primes, but less so for wide angles. Best lenses for Canon EF on Fuji GFX 100: Medium Format Talk Forum: Digital Photography Review 35mm Lenses on the Fujifilm GFX 50S \| AKPO (This one is probably the better of the two.) Steve This is one of the lists I saw. 35 f 1.4 is amazing! Thanks, barondla

01-08-2021, 02:54 PM - 1 Like	#11
Medex Pentaxian Join Date: May 2013 Location: Vilnius Posts: 1,020	DFA* 85/1.4 covers definitely 44x33 mm sensor. Some pictures were shot with this lens and Fuji GFX

01-09-2021, 06:41 AM	#12
kaseki Loyal Site Supporter Join Date: Dec 2017 Photos: Gallery \| Albums Posts: 1,138	I vaguely recall that if one wants a fast wide-angle lens with a flat field (for corner focus) and telecentric focus (to minimize brightness fall-off vignetting due to ray angles), a correction lens is needed close to the focal plane. This would seem to require a mirrorless configuration. The alternative is panning and stitching.