Mount Angenieux ARRI Bayonet or C-mount lens to A7s with speed-booster EF-adapter?

P

Patrik

Member
Hi guys!

I've got a Sony A7s camera with a E-mount to EF Speed Booster. I would like to mount an old Angenieux zoom lens to my set up. Most of the lenses I've been looking for come with either ARRI Bayonet-mount or C-mount. I found a EF to C-mount adapter: http://www.amazon.com/Fotodiox-Lens-Mount-Adapter-C-Mount/dp/B003EAY5S6, but I'm not sure if it will work.

I read some others threads about the topic, they were a few years old and before 'the time of the speed booster'. One user mentioned that there is no way to mount a ARRI Bayonet lens to Canon EF. But, he also mentioned that there is a ARRI Bayonet to PL-adapter, that might work if you screw that onto a PL to EF-adapter... Do you think it'll work?

Sony A7s > E-mount to EF Speed Booster > EF to C-mount adapter > C-mount Lens or...
Sony A7s > E-mount to EF Speed Booster > EF to PL adapter > PL to ARRI Bayonet > ARRI Bayonet Lens?

Feels like the second option would mess up the focal flange, thought the first one might work. What's your take on this?
Is there a way to figure this out using math?:undecided

Replies would be greatly appreciated!
Regards// Pat
 
There are adapters to mount Arri B and C mount straight to E mount. I have a variety, even Arri S mount too. Very easy to do and works well. I've even got mounts for cameflex, which is why the E mount is such an awesome system. I've not failed in mounting anything to it yet!

You won't be wanting to use a speedbooster with the A7s really. It's full frame already. All a speed booster will do would be to shrink the image circle. That old Angenieux lens - is it 16mm, 35mm? It's probably not full frame so there would be no point in using a speedbooster with it.

Ideally what are you trying to achieve?

cheers
Paul
 
Speed boosters will not work for this as they reduce the coverage circle to a smaller format. Typically full frame 35mm lenses to mft, I.E. 43mm image circle to 22mm image circle. This is the largest image circle C-mount can cover.
 
I'm with everyone else really, if you like your speedbooster to use full frame glass on your camera in APS-C mode, get EF full frame glass. If you're going to want to use PL mounts and the like, get the correct adapter (they can be had for pretty cheap ~$100-200).
 
Hi, and thanks a bunch for all your replies! Have been away during the weekend, therefore not being able to reply, but now I'm back (with a delicious cup of coffee)

paulcurtis said:
There are adapters to mount Arri B and C mount straight to E mount. I have a variety, even Arri S mount too. Very easy to do and works well. I've even got mounts for cameflex, which is why the E mount is such an awesome system. I've not failed in mounting anything to it yet!

You won't be wanting to use a speedbooster with the A7s really. It's full frame already. All a speed booster will do would be to shrink the image circle. That old Angenieux lens - is it 16mm, 35mm? It's probably not full frame so there would be no point in using a speedbooster with it.

Ideally what are you trying to achieve?

cheers
Paul
Click to expand...

Thank you paulcurtis for taking your time! That's awesome, I didn't know that E-mount was even more flexible than EF, thats great. I didn't think straight regarding the Speed Booster, of course it shrinks the image, not enlarges it! I shoot a lot in APS-C mode at the moment due to the benefits of reduced rolling shutter issue, while not cropping to much (and being able to get 1 more stop is great! Not that the A7s need it, but It's nice to have sometimes)

I missed one crucial aspect (sorry for that), these lenses are 16mm lenses. So, what I'm trying to achieve is mounting a 16mm primes or zoom lenses on the A7s, without getting a severe amount vignetting if that's possible?

cpc said:
With most of the 35mm cinema Angenieux lesnes APS-C is all you can hope to cover. It is possible that some longer C-mount lenses will cover the full sensor though. The A7s is pretty good in APS-C mode anyway, so a simple mechanical adapter is still useful. Something like this:
http://www.ebay.com/itm/Arri-Bayone...-FS100-Sony-NEX-E-mount-adapter-/250943015539
Click to expand...

Razz16mm said:
Speed boosters will not work for this as they reduce the coverage circle to a smaller format. Typically full frame 35mm lenses to mft, I.E. 43mm image circle to 22mm image circle. This is the largest image circle C-mount can cover.
Click to expand...

caseywilsondp said:
I'm with everyone else really, if you like your speedbooster to use full frame glass on your camera in APS-C mode, get EF full frame glass. If you're going to want to use PL mounts and the like, get the correct adapter (they can be had for pretty cheap ~$100-200).
Click to expand...

Hi guys, thanks for your input! As mentioned above, I totally forgot to tell you that this lens is a 16mm lens. Thank's cpc for the link! That adapter looks like something I can use! Though, I guess I would have to use something that works the opposite of a Speed Booster, like a tele-converter, in order to fill out the entire APS-C sized frame?

(Tnx wolfcrow for the chart!)

MountFocal Flange Distance in mm
C C-Mount17.526
E Sony E-mount18
FZ Sony PMW-F3 mount18
m43 Micro Four Thirds mount19.25
M Leica M mount27.8
FT Four Thirds mount38.67
FD Canon Manual FD mount42
EF Canon EOS EF mount44
EF-S Canon EOS EF-S mount44
A Minolta/Sony A-mount44.5
K Pentax K-mount45.46
F Nikon F-mount46.5
R Leica R-mount47
PL Arri PL mount52

Is it really possible to mount a C-mount adapter to an E-mount system without getting in trouble with the flange focal distance, since the distance is less for C-mount than E-mount? It's not much but it's still almost 0,5mm in difference. Could you wind up not being able to focus to infinity? ARRI Bayonet has a flange focal distance of 52mm, so that would be no problem I guess.


Regards
//Patrik
 
you can get a fotodiox c to e mount adapter for like 15 bucks (the metabones is like 85?), the metabones says it'll let you focus to infinity, but i cant confirm that.
if you don't want vignetting, you'll need to buy a 2x adapter for super35 (or ~2.5x for full frame) to use between the c-mount adapter and the body itself.
iirc ziess and a few others make these... but maybe only for t mounts? not sure.
 
Patrik said:
I missed one crucial aspect (sorry for that), these lenses are 16mm lenses. So, what I'm trying to achieve is mounting a 16mm primes or zoom lenses on the A7s, without getting a severe amount vignetting if that's possible?
Click to expand...

You can physically mount them no problem, the question is whether the image circle they produce will be big enough for you. You can shoot full frame or APS-C but the image will be smaller than the full frame surrounded by black.

Having said that it depends on the lens, a 16mm lens will cover 16mm minimum however quite a few of them cover larger. Generally the longer the focal lens the larger the circle too. I have a 16mm Cooke Kinetal 50mm here and it will cover APS-C no problem, a 25mm one won't quite.

Instead of a speedbooster you're looking for a teleconvertor which works in the opposite way. Most lens manufactures have them for their lenses, to turn a 300mm into a 600mm for example. However i'm not aware of a 'generic' one like speedbooster. The other side of that is you're going to loose some sharpness if you blow up the circle. Most 16mm lenses aren't as sharp anyway just because they never needed to be.

So your best bet is to grab a simple mechanical adapter and see what the image circle is like.

As for mount C onto E, yes you can the difference isn't so great and there are no mirrors to get in the way. Perhaps some odd c mount lenses go back further but i've not seen any. The adapters are like pancakes with a recessed thread. Works no problem.

cheers
Paul
 
caseywilsondp said:
you can get a fotodiox c to e mount adapter for like 15 bucks (the metabones is like 85?), the metabones says it'll let you focus to infinity, but i cant confirm that.
if you don't want vignetting, you'll need to buy a 2x adapter for super35 (or ~2.5x for full frame) to use between the c-mount adapter and the body itself.
iirc ziess and a few others make these... but maybe only for t mounts? not sure.
Click to expand...

paulcurtis said:
You can physically mount them no problem, the question is whether the image circle they produce will be big enough for you. You can shoot full frame or APS-C but the image will be smaller than the full frame surrounded by black.

Having said that it depends on the lens, a 16mm lens will cover 16mm minimum however quite a few of them cover larger. Generally the longer the focal lens the larger the circle too. I have a 16mm Cooke Kinetal 50mm here and it will cover APS-C no problem, a 25mm one won't quite.

Instead of a speedbooster you're looking for a teleconvertor which works in the opposite way. Most lens manufactures have them for their lenses, to turn a 300mm into a 600mm for example. However i'm not aware of a 'generic' one like speedbooster. The other side of that is you're going to loose some sharpness if you blow up the circle. Most 16mm lenses aren't as sharp anyway just because they never needed to be.

So your best bet is to grab a simple mechanical adapter and see what the image circle is like.

As for mount C onto E, yes you can the difference isn't so great and there are no mirrors to get in the way. Perhaps some odd c mount lenses go back further but i've not seen any. The adapters are like pancakes with a recessed thread. Works no problem.

cheers
Paul
Click to expand...

Thanks a bunch guys! Really helpful! I've now ordered a mechanical C-mount adapter from Fotodiox (Tnx caseywilsondp for the tip) and I'll give it a try once it get here! I'll post the results here!

Regards// Pat
 
caseywilsondp said:
I'm with everyone else really, if you like your speedbooster to use full frame glass on your camera in APS-C mode, get EF full frame glass. If you're going to want to use PL mounts and the like, get the correct adapter (they can be had for pretty cheap ~$100-200).
Click to expand...

Any PL mount with a retail price in that range will be crap. You may not know the difference but putting anything heavy or valuable in a mount like that is inherently dangerous to your lens, camera and usability.

I happen to be in inventor of the PL adapter for the HDSLR, and do know more than a bit about this.
 
A7s_crop_fail.jpg

Well, that fotodiox adapter didn't work out perfectly. Now that's vignetting;) This picture is taken with some extender rings (that's why it's out of focus) in APS-C mode with the Angenieux 12-120mm C-mount s16mm lens using Fotodiox adapter (E-mount to C-mount).

Do you guys have any other ideas? I love this lens, would be a shame not being able to use it somehow!

Cheers
/Pat
 
The only way is to crop the image during postproduction.
Angenieux 12-120 is a good lens but for smaller sensor cameras like blackmagic pocket.
 
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