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Adapter on top of Adapter?


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#1 Tuan Doan

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Posted 19 August 2016 - 11:31 PM

I have a EF-S lens( that comes with my Canon 600D) and a Bolex SBM( bayonet mount). Lenses are just to expensive so I wonder is it possible for me to buy C adapter for the bolex + "C to EFS adapter"(http://www.ebay.com/...=STRK:MEBIDX:IT).

 

basically 2 adapters at the same time. 'cause i couldn't find a straight adapter from bayonet to EF-S. Has anybody done this before? 

thanks.


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#2 Brian Drysdale

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Posted 20 August 2016 - 02:29 AM

I suspect success may depend upon the quality of the adapters. Cheaper ones may not be manufactured to the same tolerances as more expensive ones, so using two may double any errors. The more expensive adapters are made to the same tolerances as professional lens mounts. 


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#3 Jay Young

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Posted 20 August 2016 - 06:52 AM

Usually using two adapters results in the image circle being too far away from the film plane.  Even if back focus is still correct, you'll get sever vignetting. 


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#4 aapo lettinen

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Posted 20 August 2016 - 07:53 AM

Usually using two adapters results in the image circle being too far away from the film plane.  Even if back focus is still correct, you'll get sever vignetting.

you mean the adapter vignettes because the c thread part is too deep compared to the rear element? The back focus will stay the same unless there is something wrong with the adapters.

Efs lenses are not very well suited for film camera use, too much ramping, focus problems and only electronic aperture adjustment. I suggest using old manual stills primes instead for tele, like nikon ai-s or pentax super takumar/smc takumar lenses. If you choose m42 lenses you can fine tune the adapter by yourself with sandpaper if the ffd is not right. For wide angles you can use certain cctv/machine vision lenses like those Chinese 8mm c-mount lenses found on ebay. If you need a zoom you can look for old c-mount tv zooms or alternatively a b4 zoom with ef adapter and attaching the combo to the camera with a ef to c adapter. Good b4 zooms are expensive though and you may need to use the extender to avoid vignetting.

Still lenses usually don't have accurate focus scales anyway so it is really only up to whether it can be focused to infinity or not
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#5 aapo lettinen

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Posted 20 August 2016 - 07:55 AM

I use double or triple adapters all the time, generally it works very well but you have to test the combos beforehand of course
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#6 Nicholas Kovats

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Posted 20 August 2016 - 09:34 AM

Les Bosher's excellent Bolex Bayonet adapters occasionally show up on eBay. They are the best if you are so inclined. His stock BBM adapters are Canon FD, Nikon F, Arri PLM, B,S. As someone mentioned previously keep it simple for best results regarding older SLR/Cine primes. He can almost build anything if the camera-lens registers allow for it. Worth every penny. Bomb proof. His Bolex Bayonet to Arri PL is very beefy with a built in support system.

http://www.lesbosher.co.uk/
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