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Legacy Lens Adapters for a7 & a7R

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chijrt View Drop Down
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Post Options Post Options   Quote chijrt Quote  Post ReplyReply Direct Link To This Post Topic: Legacy Lens Adapters for a7 & a7R
    Posted: 17 October 2013 at 15:45
I used to have an NEX-5N and had purchased multiple legacy lens adapters for it like the Minolta Rokkor and Konica Hexanon adapters. As I already know these adapters will fit on the A7/A7R, will these adapters accommodate the new full-frame sensor size or were they specifically made for the NEX crop sensor sizes?
 



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Bob J View Drop Down
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Post Options Post Options   Quote Bob J Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2013 at 16:01
Looking at my NEX adapters, I can't see anything that would get in the way (the cheap adapters don't tend to have internal baffles), but there might be more vignetting from the lens on full frame in any case.

Needless to say, speed booster adapters won't work...
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Post Options Post Options   Quote rovhazman Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2013 at 16:11
We will have to see...
It seems that the M-mount adapters are ok, as few of the websites that already had the A7r said they were using M-mount lenses with their old adapters (Steve Huff, Michael Reichmann).
But I also have this concern - just looking at the frontal images of the new cameras, it seems that the mount itself already chips the sensor corners...

So you might need a careful design of the adapter to avoid heavy vignetting from legacy lenses.
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Post Options Post Options   Quote 5thElefant Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2013 at 16:15
Originally posted by rovhazman rovhazman wrote:

But I also have this concern - just looking at the frontal images of the new cameras, it seems that the mount itself already chips the sensor corners...

That's not the sensor you can see. That's a layer of glass on top of the sensor. I assume the sensor is actually smaller.

EDIT: actually the sensor must be the darker area, which isn't getting clipped. Just.
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rovhazman View Drop Down
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Post Options Post Options   Quote rovhazman Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2013 at 16:23
Simon, of course you are right. Otherwise it would be a big problem...
But still, it shows how tight it is and no room for mismatch. Compare to NEX 7:
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Post Options Post Options   Quote thornburg Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2013 at 16:45

It looks, and seems, like a really tight fit, but here's a way to look at it:

If your adapter doesn't include glass, it should be fine.

Why? Because if the adapter doesn't have an optical element, then the lens is operating at its correct registration distance, which was originally designed for 35mm film. Thus, the light cone should cover the same area, which in this case is a digital sensor.

The only way you'll encounter an issue (that didn't already exist when using the lens on the intended film camera), is if the adapter or mount blocks some of the light.

Geometrically, that's unlikely. The greatest chance of an issue would be with long registration distance lenses. So you're more likely to encounter a problem with a Nikon F lens than with a Konica Hexanon lens. Also, I believe it would only happen with "fast" lenses. So if you're adapting a Nikon f/1.2 lens, you'll want to check to see if it's a problem.
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darosa View Drop Down
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Post Options Post Options   Quote darosa Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2013 at 17:07
Yes, I think the registration distance is an important aspect here. Leica M is short, so no problem but M42 etc might be a bit dark at the corners. And the longer the registration distance, the more important the quality/build of your adapter will be. With an APS-C sensor specs needn't be optimal. But with a FF sensor, they must be because there is no room for error.

I have adapters for many mounts and I'll have to wait and see which will work on my 7r without vignetting. I expect to see new FF adapters appear in the coming weeks.

Sony itself has introduced 2 new FF A-mount adapters for the A7.

Edited by darosa - 17 October 2013 at 17:44
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Post Options Post Options   Quote PhinioxGlade Quote  Post ReplyReply Direct Link To This Post Posted: 02 November 2013 at 06:09
I tried the Super Takamur 50mm f1.4 using a cheap m42 adapter. I could see no issues, I've had go luck with this adapter.
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Post Options Post Options   Quote eddyizm Quote  Post ReplyReply Direct Link To This Post Posted: 26 December 2013 at 22:18
Any updates? Perhaps someone could post some links to adapters they've bought and tried?
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Post Options Post Options   Quote Peekayoh Quote  Post ReplyReply Direct Link To This Post Posted: 27 December 2013 at 11:29
I'm using the Pixoo and Metabones adapters with no problem.
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Post Options Post Options   Quote Peekayoh Quote  Post ReplyReply Direct Link To This Post Posted: 28 December 2013 at 11:53
Actually, I should qualify that last remark. I said there was no problem but that was in relation to the issue of vignetting by the adapters.

There are issues of build quality with the Pixoo but then, the Metabones is 10 times the price.
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Post Options Post Options   Quote eddyizm Quote  Post ReplyReply Direct Link To This Post Posted: 29 December 2013 at 02:52
@peekayoh - Thanks for the info!
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 29 December 2013 at 09:42
I cannot be of much help (don't have an a7(R)), but here's 4 pages on getDPI.com on adapters for these camera's. Hope you can find something useful there.
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