Slightly thicker PK to EF adapters?

[Spotmatic]

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).

[calvin83]

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.

[Spotmatic]

Well, at least I have asked. Maybe I will look for a super slim PK extension tube. Who knows, it might exist.

[calvin83]

[Spotmatic]

[calvin83]

[fuzzywuzzy]

[calvin83]

[trev]

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

[dickb]

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..

[koji]

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.

[martinsmith99]

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.