Old Praktica lenses on 6d - risk of hitting the mirror?

odd jim

odd jim

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I've just bagged a set of lenses from an old Praktika bx10, a 28mm f/2.8, 50mm and 70-200. I'm not even sure who built the lenses, but I'm guessing they'll either be B mount (?m42?) or Praktica's bayonet mount (I haven't picked them up yet).

I'm guessing they'll be fine on a cropped body with he right adaptor, but is there is risk of hitting the mirror on FF bodies?
 
wouldnt of thought so, as the original camera was slr too, but its probably only the 28mm that might be a worry
 
Damn, hope the 28mm is ok, thats why I bought them (they came all together, with the body and the old flash, the 28mm was all I wanted TBH!)
 
i say its the risky one because of how lenses where designed for film, where it was fine for the rear element to be close to the film and have a acute angle... and it made sense todo that with shorter focal lengths... but as its for a slr anyways itll almost certainly be ok :)
 
I'd get the adaptor and eyeball how much the rear element will protrude through the adaptor into the mount (compare it against some of your standard EF lenses)? Take it from there

I use an EF-S 10-22 with the plastic baffle pulled out on my 6D and have hit the mirror with it a few times; temporarily lost continence with each one but no apparent lasting damage. I know that it safely clears the mirror at 16mm but not at 13mm, so I could try and measure the length of the rear element at something safe like 17mm if you want? (PM me to remind me if it would be of help)
 
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Those lenses are not pk mount. They are actually pb mount. Two problems - firstly they won't reach infinity on an eos camera due to the register distance being too short. Secondly, most will hit the innards of the 6D or not mount at all. I haven't spent too much time working out what is hitting what to be honest, as the lenses are only of average quality :(

The 28/2.8 is usually a modified version of the old Pentacon 29/2.8, whilst some were rebadged Sigma mini wide 28/2.8s which were pretty decent.

The 50/1.8 is usually a Pentacon made lens, and is OK stopped down. There are also some Carl Zeiss Jena Pancolar 50/1.8s about which are better. The zooms were mostly Sigma lenses rebranded.

Best bet is to flog the lot and buy some m42 gear instead.
 
Thanks for the responses guys, looks like I might be having a play with them on film then, lol!
 
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