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kypfer
Joined: 27 Sep 2017
Posts: 514
Location: Jersey C.I.
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 Posted: Thu Nov 09, 2017 4:00 pm Post subject: Pentacon Pancake on a Pentax! |
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kypfer wrote:
This conversion was a lot easier than I though it was going to be!
1. Unclip the plastic "shroud" on the rear of the lens mount (this may already be missing).
2. Remove the metal Praktica bayonet mount (4 screws)
3. Remove the plastic piece with the orange "dot", containing the three electrical contacts (3 screws), including the aperture actuating lever. Be careful to not allow the aperture mechanism to come loose, it'll just sit there if you leave it alone!
4. Affix "non-infinity-focus" M42/PK flange to the metal lugs exposed in the previous step ... I used super-glue but you could drill and screw if you've got the facility.
Job done! The lens will operate with a full range of apertures in "manual stop-down" mode.
The lens I used is an early model, with the orange plastic "dot". The later model (painted "dot", plastic body) may be different.
The final result does focus slightly "beyond infinity" at one end of the scale and to around 2ft., similar to the original minimum focus, at the other end of the scale. The super-critical may want to fiddle with shims to align the focussing scale more accurately.
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Last edited by kypfer on Thu Nov 23, 2017 2:13 pm; edited 2 times in total |
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luisalegria
Joined: 07 Mar 2008
Posts: 6627
Location: San Francisco, USA
Expire: 2018-01-18
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| Posted: Thu Nov 09, 2017 4:45 pm Post subject: |
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luisalegria wrote:
Good adaptation.
The flanged M42-PK (or EOS) adapters are very useful for this, I always have a few around just in case some easily adaptef lens like this turns up.
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I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work. |
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TrueLoveOne
Joined: 30 Sep 2012
Posts: 1840
Location: Netherlands
Expire: 2013-12-24
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| Posted: Fri Nov 10, 2017 8:48 am Post subject: |
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TrueLoveOne wrote:
Now that it fits: samples please! 
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My Flickr photostream: http://www.flickr.com/photos/chantalrene/
Sony A7, Canon 5D mkII, Minolta 7D + RD3000 and some more.....
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Oldhand
Joined: 01 Apr 2013
Posts: 6008
Location: Mid North Coast NSW - Australia
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| Posted: Fri Nov 10, 2017 11:57 am Post subject: |
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Oldhand wrote:
Well done.
I notice that you are shooting film - it will be interesting to see what you think of the results.
Thanks for sharing this fix
Tom |
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cooltouch
Joined: 15 Jan 2009
Posts: 9097
Location: Houston, Texas
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| Posted: Fri Nov 10, 2017 12:59 pm Post subject: |
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cooltouch wrote:
I have a Pentax brand M42-to-K adapter and it fits the camera like an insert, converting the camera to an M42 mount for all practical intents and purposes. It's a bit of a delicate operation getting the adapter off the camera.
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kypfer
Joined: 27 Sep 2017
Posts: 514
Location: Jersey C.I.
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| Posted: Fri Nov 10, 2017 4:57 pm Post subject: |
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kypfer wrote:
| Oldhand wrote: |
Well done.
I notice that you are shooting film - it will be interesting to see what you think of the results.
Thanks for sharing this fix
Tom |
Sorry, I'm not using film any more. I just use the old chassis for testing stuff, just in case the mirror gets jammed or something. I'll be using the lens on my Pentax digital SLR's ... examples to follow. |
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kypfer
Joined: 27 Sep 2017
Posts: 514
Location: Jersey C.I.
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| Posted: Fri Nov 10, 2017 5:06 pm Post subject: |
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kypfer wrote:
| cooltouch wrote: |
| I have a Pentax brand M42-to-K adapter and it fits the camera like an insert, converting the camera to an M42 mount for all practical intents and purposes. It's a bit of a delicate operation getting the adapter off the camera. |
I use that type of adaptor as well. My original "Mount Adaptor K", as made and badged by Pentax, is a precision item and fits and unclips very easily. They are also horrendously expensive these days. I managed to get mine before using the old manual-focus lenses became popular and the prices went up! The similar after-market adaptors that I've tried can be a real PITA, needing the supplied tool to unclip them!
Fortunately, for this type of conversion, the flanged adaptor is more suitable (and significantly cheaper!) |
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kypfer
Joined: 27 Sep 2017
Posts: 514
Location: Jersey C.I.
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| Posted: Fri Nov 10, 2017 5:12 pm Post subject: |
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kypfer wrote:
| TrueLoveOne wrote: |
| Now that it fits: samples please! |
Blowing a bit of a gale this afternoon, with the sun going in and out and the foliage blowing all over the place. This one shot, taken "wide open" with my Pentax K5, gives an idea of the resolution and bokeh. Hopefully, I'll get a wider range of results in the future 
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kypfer
Joined: 27 Sep 2017
Posts: 514
Location: Jersey C.I.
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| Posted: Mon Nov 13, 2017 3:18 pm Post subject: |
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kypfer wrote:
A couple more examples taken this morning at 100ASA sensitivity in my Pentax K-5:
Up close and personal, minimum focus and 1/2000sec @ maximum aperture.
1/1000sec @ f/8 with a lens hood. The full sun is just out of shot, upper right. |
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visualopsins
Joined: 05 Mar 2009
Posts: 10530
Location: California
Expire: 2025-04-11
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| Posted: Mon Nov 13, 2017 4:06 pm Post subject: |
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visualopsins wrote:
"How to convert Practika mount to Pentax PK"
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Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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Oldhand
Joined: 01 Apr 2013
Posts: 6008
Location: Mid North Coast NSW - Australia
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| Posted: Mon Nov 13, 2017 8:35 pm Post subject: |
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Oldhand wrote:
| kypfer wrote: |
| Oldhand wrote: |
Well done.
I notice that you are shooting film - it will be interesting to see what you think of the results.
Thanks for sharing this fix
Tom |
Sorry, I'm not using film any more. I just use the old chassis for testing stuff, just in case the mirror gets jammed or something. I'll be using the lens on my Pentax digital SLR's ... examples to follow. |
You should be pleased with your results - the lens performs very well indeed
Tom
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Sjak
Joined: 29 Sep 2017
Posts: 696
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| Posted: Mon Nov 13, 2017 9:13 pm Post subject: |
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Sjak wrote:
The last picture is superb!
I have the same lens, but in Robot screw-mount (and bought it out of curiosity.) Now getting curious to actually test it  |
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