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Spotmatic
Joined: 18 Aug 2008 Posts: 4045 Location: Netherlands
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Posted: Fri Feb 18, 2011 11:25 am Post subject: Slightly thicker PK to EF adapters? |
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Spotmatic wrote:
I was just thinking out loud, but do Pentax K to EF adapters exist which are slightly thicker than normal? As I almost never take photos at or around infinity, such an adapter would be perfect for me (no mirror clearance issues). _________________ Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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calvin83
Joined: 12 Apr 2009 Posts: 7559 Location: Hong Kong
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Posted: Fri Feb 18, 2011 4:20 pm Post subject: |
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calvin83 wrote:
Most cheap PK to EOS adaptor cannot lock the lens firmly. Not sure if someone can made a thick adaptor but I think no company will make such adaptor. _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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Spotmatic
Joined: 18 Aug 2008 Posts: 4045 Location: Netherlands
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Posted: Fri Feb 18, 2011 4:41 pm Post subject: |
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Spotmatic wrote:
Well, at least I have asked. Maybe I will look for a super slim PK extension tube. Who knows, it might exist. _________________ Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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calvin83
Joined: 12 Apr 2009 Posts: 7559 Location: Hong Kong
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Posted: Fri Feb 18, 2011 4:55 pm Post subject: |
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calvin83 wrote:
Spotmatic wrote: |
Well, at least I have asked. Maybe I will look for a super slim PK extension tube. Who knows, it might exist. |
I think the best way to use PK lens on EOS camera is mount conversion. _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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Spotmatic
Joined: 18 Aug 2008 Posts: 4045 Location: Netherlands
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Posted: Fri Feb 18, 2011 5:08 pm Post subject: |
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Spotmatic wrote:
calvin83 wrote: |
Spotmatic wrote: |
Well, at least I have asked. Maybe I will look for a super slim PK extension tube. Who knows, it might exist. |
I think the best way to use PK lens on EOS camera is mount conversion. |
And that's something I will not do. NEVER! _________________ Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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calvin83
Joined: 12 Apr 2009 Posts: 7559 Location: Hong Kong
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Posted: Fri Feb 18, 2011 5:17 pm Post subject: |
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calvin83 wrote:
Spotmatic wrote: |
calvin83 wrote: |
Spotmatic wrote: |
Well, at least I have asked. Maybe I will look for a super slim PK extension tube. Who knows, it might exist. |
I think the best way to use PK lens on EOS camera is mount conversion. |
And that's something I will not do. NEVER! |
or buy a pentax camera. _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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fuzzywuzzy
Joined: 18 Dec 2010 Posts: 1258 Location: Down East, Canada, eh?
Expire: 2013-11-30
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Posted: Fri Feb 18, 2011 7:35 pm Post subject: |
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fuzzywuzzy wrote:
Spotmatic wrote: |
Well, at least I have asked. Maybe I will look for a super slim PK extension tube. Who knows, it might exist. |
Might be easier to find a EF extension tube, there seem to be a lot on Ebay.
I didn't look very hard but this one has a 9mm extension tube:
Click here to see on Ebay
9mm still sounds like a lot.
It looks like there's an EF adapter on each side that screw onto the various sizes of threaded tube. It might be possible to just superglue the 2 EF pieces together for a relatively thin shim. One thing's for sure, the price is right for experimenting. |
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calvin83
Joined: 12 Apr 2009 Posts: 7559 Location: Hong Kong
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Posted: Sat Feb 19, 2011 4:35 am Post subject: |
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calvin83 wrote:
fuzzywuzzy wrote: |
Spotmatic wrote: |
Well, at least I have asked. Maybe I will look for a super slim PK extension tube. Who knows, it might exist. |
Might be easier to find a EF extension tube, there seem to be a lot on Ebay.
I didn't look very hard but this one has a 9mm extension tube:
Click here to see on Ebay
9mm still sounds like a lot.
It looks like there's an EF adapter on each side that screw onto the various sizes of threaded tube. It might be possible to just superglue the 2 EF pieces together for a relatively thin shim. One thing's for sure, the price is right for experimenting. |
Not sure if the quality of such extension tube will be good enough to make a small extension tube but your idea is worth to try. _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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trev
Joined: 30 Jun 2010 Posts: 580 Location: North Wales - UK
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Posted: Sat Feb 19, 2011 8:16 pm Post subject: |
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trev wrote:
Heres a thought --- why not get a PK film camera such as the MX or ME?
Both excellent cameras and pretty much cheap as chips. Of course there are other PK fit film cameras out there _________________ Fuji X10, X-A1 and Samsung nx 20 |
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dickb
Joined: 04 Apr 2008 Posts: 821
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Posted: Sat Feb 19, 2011 9:45 pm Post subject: |
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dickb wrote:
How thick an adapter would be optimal for you? A normal PK to EF adapter is just over a mm thick.
The next thinnest off-the-shelf option I can think of is a combination of a Pentax K to Nikon F macro adapter combined with a normal Nikon F to EF adapter. I can't tell exactly how thick the macro adapter is, my guess would be at least 8mm.
No extension tubes I know of for either Canon EF or Pentax K are less than 12mm thick. They all have a lens locking pin mechanism which requires a depth of several mm. The cheap Canon tube mentioned earlier in this thread isn't 9mm thick, that's the width of the smallest extension tube. You need a lens mount ring and a camera mount ring. For Canon those two together are 16mm thick. The 9mm ring can be added between those to create a 25mm extension ring.
You could buy a set of cheap chinese Canon EF and Pentax extension tubes and use a Pentax lens mount ring together with a Canon camera mount ring. As far as I know both sets have a 60mm 0.75 pitch thread. You will end up with a ring about 14mm thick, I guess.
The best solution may be to create your own adapter like I did for Canon FD to EF:
http://forum.mflenses.com/thin-adapter-for-fd-to-eos-possible-t17993,start,15.html
In your case, screwing/glueing the front part of a PK extension tube onto an EF ring should result in an adapter of anywhere between 3 and 8mm. You won't have the easy to use lens locking pin though.. |
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koji
Joined: 21 Jul 2008 Posts: 2107 Location: Hiroshima, Japan
Expire: 2012-12-27
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Posted: Sat Feb 19, 2011 11:18 pm Post subject: |
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koji wrote:
My thought: Find a Nikon->EF adapter of two piece construction, take off
the central part of this adapter. Then you glue PK->EF adapter to half-sized
F->EF adapter, it will end up to 3~4mm thick PK->EF adapter though you
may not have lens lock mechanism to the canon body as dickb suggested.
This method has one merit, when you glue them together you can make
perfectly aligned PK->EF adapter, ie. your lens's distance marker will be
at the top unlike some PK->EF adapter cannot meet this. One more thing is
you may not have to take off lens' aperture lever, since this DIY adapter
is thick enough to avoid a complication. _________________ Our Home Page has 18,200 photos in 575 directories today.
Lenses: https://www.pbase.com/kkawakami/top_level_my_lenses |
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martinsmith99
Joined: 31 Aug 2008 Posts: 6950 Location: S Glos, UK
Expire: 2013-11-18
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Posted: Sun Feb 20, 2011 4:58 pm Post subject: |
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martinsmith99 wrote:
I have a PK to EOS that works ok but no idea of the maker or where I got it.
Sorry that really wasn't worth writing. _________________ Casual attendance these days |
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