Pentax 67 for APSC


bforbes

Link Posted 01/10/2019 - 11:22
Has anyone any experience of using Pentax 67 lenses on APSC bodies.
One reason I'm interested is for use on a tilt/shift adapter, where I read the larger coverage circle of medium format is an advantage in the shift mode.
When trying the shift with 35mm FF lenses the coverage circle does not allow use of a full tilt due to "vignette".
I'd also appreciate any help with working out the relative focal length of a 67 lens on an APSC body.

I understand Pentax made an adapter for 67 lens to M42 mount (Pentax P-Adapter) so it must be possible.
Barrie
Too Old To Die Young

http://www.pentaxphotogallery.com/artists/barrieforbes

johnriley

Link Posted 01/10/2019 - 12:49
It is possible, but I suspect the adapters will be both rare and expensive. Also, the resolution of the 67 lenses may be a bit on the low side to get the best out of an APS-C format.
Best regards, John

bforbes

Link Posted 01/10/2019 - 13:06
johnriley wrote:
Also, the resolution of the 67 lenses may be a bit on the low side to get the best out of an APS-C format.

Do you mean the resolution would be low because of the 67 format, or because of the age of the design?
Barrie
Too Old To Die Young

http://www.pentaxphotogallery.com/artists/barrieforbes

johnriley

Link Posted 01/10/2019 - 13:20
Larger format lenses didn't need such high resolution figures because they didn't need as much enlargement from the bigger format. Nobody designs stuff in excess of what's needed. Smaller formats need higher resolution.

That doesn't stop 67 and 645 lenses being useful though, usually on full frame. Whether or not APS-C is starting to be a step too far I'm not sure.
Best regards, John

Helpful

RobL

Link Posted 01/10/2019 - 14:13
You would probably be better off using the Samyang 24mm tilt-shift lens available in K-mount. I use it on a K1 and it is excellent.

bforbes

Link Posted 01/10/2019 - 14:42
RobL wrote:
You would probably be better off using the Samyang 24mm tilt-shift lens available in K-mount. I use it on a K1 and it is excellent.

I already have a cheap tilt shift adapter. But experiments with shift and a couple of FF lenses were unsuccessful, due to the small circle of coverage. Just wondered if, without costing a lot of money, I could make use of the larger circle offered by medium format, for what might be a bit of a whim. It seems not
Barrie
Too Old To Die Young

http://www.pentaxphotogallery.com/artists/barrieforbes

pschlute

Link Posted 01/10/2019 - 16:10
You could always try free-lensing
Peter



My Flickr page

bforbes

Link Posted 01/10/2019 - 17:10
pschlute wrote:
You could always try free-lensing

Pardon?
Barrie
Too Old To Die Young

http://www.pentaxphotogallery.com/artists/barrieforbes

womble

Link Posted 01/10/2019 - 18:19
I've just bought a 90mm large format lens to use on my Horseman 5x4 view camera. I've not used my large format gear nearly often enough partly because my wide-angle lens was a bit of a pain to use. The new lens is much easier, and hopefully I'll start getting more out of my LF set-up. I do use a Pentax loupe, but I don't think that'll allow me to post any images here! One day I'll spring for a Pentax Spotmeter too...
Kris Lockyear
It is an illusion that photos are made with the camera… they are made with the eye, heart and head. Henri Cartier-Bresson
Lots of film bodies, a couple of digital ones, too many lenses (mainly older glass) and a Horseman LE 5x4.

My website

pschlute

Link Posted 01/10/2019 - 19:36
bforbes wrote:
pschlute wrote:
You could always try free-lensing

Pardon?

Free lensing. You don't attach the lens to the camera. Takes a bit of practise but has the advantage of being able to use any lens you like. No adapter required.
Peter



My Flickr page

bjolester

Link Posted 01/10/2019 - 20:40
Are you aware of the Mirex tilt-shift adapter? They have a version for Pentax 67 lenses for many different mounts, including Pentax K. Joe Cornish and Tim Parkin use the Mirex with Sony A7 cameras, and are very positive about the Mirex adapter:

http://www.mirex-adapter.de/preisliste.htm

Regarding Pentax 67 lenses on Pentax aps-c bodies, I have briefly used some of my Pentax 67 lenses on the K-5 with the Pentax 67-K adapter. The top Pentax 67 lenses like the SMC 45/4, SMC 105/2.4 and the SMC 165/2.8 should be just as good on an aps-c Pentax as they are on the Pentax 67. Forum member "mikeyscope" (Mike Dickson) uses many of his Pentax 67 lenses on Pentax DSLRs for outstanding astrophotography, so resolution and sharpness should not be an issue. The main disadvantage with these 67 lenses are that they are big and heavy.
Bjørn

PPG
Flickr
Last Edited by bjolester on 01/10/2019 - 20:42

Helpful

bjolester

Link Posted 01/10/2019 - 20:48
Here is an image in mikeyscope’s PU gallery with the K-5 and Pentax 67 SMC 165/2.8:

https://www.pentaxuser.com/photo/user-9178/comet-c2011-l4-panstarrs---andromeda-...
Bjørn

PPG
Flickr

bjolester

Link Posted 01/10/2019 - 20:57
One of the sharpest lenses among Pentax 67 lenses is the SMC 55/4, and if you intend to do landscapes for instance, this could be an okay focal length. I believe the SMC 55/4 is less expensive than the "iconic" SMC 105/2.4. Both of these are very sharp lenses.

https://www.pentaxforums.com/lensreviews/SMC-Pentax-67-55mm-F4-Lens.html
Bjørn

PPG
Flickr

bforbes

Link Posted 01/10/2019 - 22:19
Thanks Bjørn. What I have in mind is an architectural shot with limited space to move away from the subject. So the lens with the widest field of view would be good. I'm assuming that would be the 45mm 67, but I've got know reference for how that relates to an APSC body.
Barrie
Too Old To Die Young

http://www.pentaxphotogallery.com/artists/barrieforbes

bjolester

Link Posted 01/10/2019 - 22:57
The Pentax 67 SMC 45/4 performs like a 45mm lens on aps-c. On the Pentax 67 camera, on the other hand, this lens corresponds roughly to 22mm FOV on a full frame camera or like the DA 15/4 on aps-c.

The Pentax 67 SMC 45/4 is the widest rectilinear lens in the Pentax 67 system, and is among the best performers. Over at the American forum there is a member "Desertscape" (Steve Rasmussen) who has high competence with the P67 lenses and has written reviews of many of them. His review of the SMC 45/4 is very informative, also about sharpness and other characteristics.
Bjørn

PPG
Flickr
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