Adapter for EF-S Lens to 6D Body

I have a Canon 6D & am considering an adapter for an EF-S lens I have. A couple of questions:

1. Are there any inherent problems with using an EF-S lens on a full-frame camera such as the 6D?
2. If not, does Canon sell such an adapter?

Thank you kindly.

It will mount, no problem.

I have to disagree with Tapeman. Frustrating to get conflicting advice, don't worry, I will back up my statement with evidence.

An EF-S lens will not mount on your 6D or any 1D body or 5D of any model.

It can be modified to fit. Depending on the actual EF-S lens this can be done by simply "popping off" a plastic part or it may require removing the lens mount and taking to it with a file (eg, 10-18mm)

Forum member msowsun has made several threads regarding EF-S lenses on full frame.
eg, his 10-18mm thread.
https://photography-on-the.net …/showthread.php​?t=1388461

You can search for other threads by Mike for other EF-S lenses.

Problems - the mirror may hit the back of the lens. Maybe only at certain focal lengths. Mike states he has had this happen hundreds of times, but no problem experienced due to that.
You will probably get vignetting at wider end of the focal length on a zoom too.

There is no Canon adapter. (They went to the trouble of trying to prevent you using an EF-S lens for the 2 reasons mentioned above)

Oops, my bad, I was thinking EF lenses on crop bodies.

the only "adapter" i could think of would be a 1.4X teleconverter...either way it kinda isn't something that's normally done...what lens are you trying to mount on the 6D...you realize there's potential for a lot of vignette making the lens a pretty bad choice, right?

Thank you for the responses. I must admit that I had suspicions regarding mounting an EF-S lens on a full-frame camera. Your responses confirmed my thoughts. And for that I thank you.

Best.

DreDaze wrote in post #18048845
the only "adapter" i could think of would be a 1.4X teleconverter...either way it kinda isn't something that's normally done...what lens are you trying to mount on the 6D...you realize there's potential for a lot of vignette making the lens a pretty bad choice, right?

Possibly a third-party teleconverter will work with select telephoto EF-S lenses, but I doubt any will accept wide angles. Canon's teleconverters extend into the rear of the lens, and only select EF lenses are compatible. They don't work with EF-S lenses.

An extension tube should work, with the obvious loss of infinity focus, but with the benefit of the EF-S lens's image circle now possibly covering the entire full-frame sensor (with enough extension). I could imagine using EF-S lenses on the 6D for macro work this way, but have not tried it. Surely someone here must have tried a tube + EF-S 60mm macro on full frame?

EDIT: Two other PotN users have confirmed this works (60mm on FF with tubes)
https://photography-on-the.net …read.php?t=1149​853&page=2

canon EF-S mounts will not go onto a full frame, but third party crop lenses will fit on FF with no adapter. There are potential issues with the mirror hitting the lens which would be a big problem, and there would most certainly be moderate to severe vignetting.

I put my Tamron 17-50 on my 6D and it worked fine except for vignetting.

plenty of info around POTN about what will and what won't work.

At least a few people used to put a 1.4x on the 10-22 without the baffle...you're right about it having to be a third party TC

DreDaze wrote in post #18052528
At least a few people used to put a 1.4x on the 10-22 without the baffle...you're right about it having to be a third party TC

That sounds like a way to make a fairly expensive yet poor-performing alternative to a proper 16-35mm. Using EF-S macro lenses on tubes seems reasonable, since there is no IQ degradation and good sensor coverage from the extension enlarging the projected image circle. Most other attempts to adapt EF-S lenses to FF bodies do not make sense to me.

absplastic wrote in post #18052729
That sounds like a way to make a fairly expensive yet poor-performing alternative to a proper 16-35mm. Using EF-S macro lenses on tubes seems reasonable, since there is no IQ degradation and good sensor coverage from the extension enlarging the projected image circle. Most other attempts to adapt EF-S lenses to FF bodies do not make sense to me.

depends on how you look at it really...it's not expensive if you're not buying anything you don't already own...it's certainly conceivable that someone could have a 1.4XTC and an aps-c ultra wide angle...so putting the two together is costing you nothing, and it gets you wider than 16mm, as it's wide end is 14mm...if you're using it for a landscape then you're going to be stopped down anyways, so any IQ degradation doesn't become as noticeable

now there are a few FF wide angles that go wider than 14mm, but a few years back that wasn't really the case

A lot of theories and ideas, let's not lose sight of the OP's questions.

kitjv wrote in post #18048510
1. Are there any inherent problems with using an EF-S lens on a full-frame camera such as the 6D?

Yes, if it's a Canon EF-S it won't mount to a 6D. If it's 3rd party you can mount it and shoot it and it will just have a dark circle.

No, nor does any 3rd party sell an adapter intended for this purpose.

I'd say the best option would be to simply not try any of the hacks and move on.

Anyway I guess you can add my reply to the ongoing discussion as it seems the OP was smart enough to grasp the reality!

DreDaze wrote in post #18052864
depends on how you look at it really...it's not expensive if you're not buying anything you don't already own...it's certainly conceivable that someone could have a 1.4XTC and an aps-c ultra wide angle...so putting the two together is costing you nothing, and it gets you wider than 16mm, as it's wide end is 14mm...if you're using it for a landscape then you're going to be stopped down anyways, so any IQ degradation doesn't become as noticeable.

Things have changed very recently in terms of what's available for TCs (EF-S compatible ones), but my recollection of those who tried this combo in the past is that they had to modify the 10-22mm even to get it to mount on a Kenko TC, as they have EF mounts just like FF bodies. And once mounted, it bottomed out at around the 12mm point, making it effectively a 17-31mm zoom with more vignetting than a 16-35.

While working with stuff you already have does not cost anything in terms of outlay, it would still be prudent to consider how much (if at all) the 10-22mm is going to be used on an APS-C body, once the full-frame body is acquired, particularly if it requires destructive modification of the lens mount to even test out the idea. The 10-22mm holds its value well enough that trading up to a 16-35 or 17-40 wouldn't be that big of a net spend, and certainly a very worthwhile IQ upgrade from any solution involving a 3rd party TC.

CyberDyneSystems wrote in post #18052867
A lot of theories and ideas, let's not lose sight of the OP's questions.

Yes, if it's a Canon EF-S it won't mount to a 6D. If it's 3rd party you can mount it and shoot it and it will just have a dark circle.

No, nor does any 3rd party sell an adapter intended for this purpose.

I'd say the best option would be to simply not try any of the hacks and move on.

Anyway I guess you can add my reply to the ongoing discussion as it seems the OP was smart enough to grasp the reality!

The best advice. Just thinking about "popping off" pieces of a lens and "taking a file" to a lens just sounds way too risky to me.

Just move on...

stevewf1 wrote in post #18063090
The best advice. Just thinking about "popping off" pieces of a lens and "taking a file" to a lens just sounds way too risky to me.

Just move on...

Popping off takes a half a second to take off or put back...there's really no risk to that method