10d and EFS lens

[the7ferret]

I was wondering...
I dont have a 10D but it cannot accomadate EFS lens since they will hit the mirror.
What if you were to put a extention tube on the EFS lens?

[Dante King]

That sould do it. I think. Dont have a 10D so really cant test.

[Jesper]

EF-S lenses do not fit on the 10D because the EF-S lens mount is physically different than the EF mount. So it's not just because the mirror would hit the back of the lens.

With an extension tube, you will not be able to focus at infinity, so it's not really a good way to make your 10D fully useful with EF-S lenses.

[PacAce]

EF-S lenses do not fit on the 10D because the EF-S lens mount is physically different than the EF mount. So it's not just because the mirror would hit the back of the lens.

With an extension tube, you will not be able to focus at infinity, so it's not really a good way to make your 10D fully useful with EF-S lenses.
That's a good point about the differences in the mounts, Jesper, and it makes sense that the EF-S lenses wouldn't fit on a 10D because of it. But, now that I think of it, why were there EF-S lens "hack" jobs that literally hacked off the ends of the lens protrusion so that they would fit in a 10D. I wonder how they got the lens to fit the 10D in the first place. Or do you think they also hacked the lens mount as well?

[Tom W]

That's a good point about the differences in the mounts, Jesper, and it makes sense that the EF-S lenses wouldn't fit on a 10D because of it. But, now that I think of it, why were there EF-S lens "hack" jobs that literally hacked off the ends of the lens protrusion so that they would fit in a 10D. I wonder how they got the lens to fit the 10D in the first place. Or do you think they also hacked the lens mount as well?

I've seen two types of "hack" on the EF-S mount - one where they physically "hacked" the mount to fit the EF camera on an 18-55 lens. The other was to physically detach the EF-S mount and attach an ordinary EF mount to the lens (also the 18-55). IIRC, both fit the 10D after the hack and I beleive the 1D as well, but with significant vignetting on the 1D. And, neither would fit on the 1-series full-frame or film cameras due to the physical mirror size (mirror hitting the lens).

While this was successful on the 18-55 lens, there is no guarantee that it would work on other EF-S lenses. It depends on how far back and how large the rearmost lens element actually is. Somebody with plenty of money is bound to try other lenses some day, but I'm not that somebody.

[eosster]

I don't understand people modifying a EF-s lens, why go thru the trouble....

[PacAce]

I've seen two types of "hack" on the EF-S mount - one where they physically "hacked" the mount to fit the EF camera on an 18-55 lens. The other was to physically detach the EF-S mount and attach an ordinary EF mount to the lens (also the 18-55). IIRC, both fit the 10D after the hack and I beleive the 1D as well, but with significant vignetting on the 1D. And, neither would fit on the 1-series full-frame or film cameras due to the physical mirror size (mirror hitting the lens).

While this was successful on the 18-55 lens, there is no guarantee that it would work on other EF-S lenses. It depends on how far back and how large the rearmost lens element actually is. Somebody with plenty of money is bound to try other lenses some day, but I'm not that somebody.
IIRC, wasn't there a zoom range in the 18-55 lens where the hacked lens couldn't be used because the rear of the lens assembly moved back too far, allowing the mirror to strike it on the 10D?

[CyberDyneSystems]

I don't think the 18-55mm 10D combo had trouble with the Mirror,.

The 1D with it's full frame mirror certainly would.

The EF-S lens simply was not around when the 10D came out,.thus the 10D does not have the EF-S mount. I am pretty sure that other than the mount,. the 10D theoretically could handle any of the EF-S lenses.

[hickory]

IIRC, wasn't there a zoom range in the 18-55 lens where the hacked lens couldn't be used because the rear of the lens assembly moved back too far, allowing the mirror to strike it on the 10D?


There is no problem with this modified lens on a 10D. I have been using one since last fall without a single problem. For the $55.00 I paid for it, it is a cheap but very good wide angle lens. I actually bought it by mistake from a member of this forum and instead of selling it I found the modification and did myself in about an hour. It works plain and simple!

Here's a pic I took up close of a Ruffed Grouse Feather:

http://www.pbase.com/twdarby/image/40714324

[louiseo]

The hack sounds easy enough but it seems you are going to end up with a bigger opening on the hacked end that it had before? Is that going to cause a problem? Does the auto focus still work? Has anyone tried changing the mount by taking the mount of an ef lens and screwing it on to the ef-s lens?

[slin100]

The EF-S lens simply was not around when the 10D came out,.thus the 10D does not have the EF-S mount. I am pretty sure that other than the mount,. the 10D theoretically could handle any of the EF-S lenses.
That's right, the 10D predates the EF-S lens mount.

I wonder, rather than hacking an EF-S lens to fit a 10D, is it possible to change a body's lens mount from EF to EF-S? Is the lens mount an integral part of the body or is it attached by screws?

[CyberDyneSystems]

You know,. I just got a $5,500.00 lens for more than 1.000.00 less than the going rate do to the fact that the EF mount was damaged...

$34.00 and ten minutes later my 500mm had a brand new striaght from Canon EF mount and it saved me a grand.

Changing the mount was a peice of cake..

...looking at the mount on the 20D, it actually looks significantly easier to replace the mount on the Camera side,. (no need to fidget with the electrical contacts)

So yes, Steven,. it's just mounted with screws as far as I can see.
One could find the 20D part number on line,. and order it from a Canon service center,. I imagine it would not cost much more than the lens mount,. say about $40.00... and give it a try?

[CyberDyneSystems]

The hack sounds easy enough but it seems you are going to end up with a bigger opening on the hacked end that it had before? Is that going to cause a problem? Does the auto focus still work? Has anyone tried changing the mount by taking the mount of an ef lens and screwing it on to the ef-s lens?

As much as the EF mounts look alike,. they do differ to some degree.. I don't know if this effects the situation here,. but fyi the EF mount on he big Canon primes is significantly different from the smaller lenses... (I know this because at first I was going to try to "borrow" a mount from one of my other lenses to get the 500mm up and running. They wouldn't fit)

[slin100]

You know, I figure Canon may have thought of this possibility and put the screws in a different place. Maybe someone that owns a 10D and 20D/350D can take some measurements.

Another possibility is to order an EF lens mount. It may not have been economical to pay for a new mount for the 18-55 lens, but it may make sense for either the 10-22 or 17-85 EF-S lenses.

[PacAce]

You know, I figure Canon may have thought of this possibility and put the screws in a different place. Maybe someone that owns a 10D and 20D/350D can take some measurements.

Another possibility is to order an EF lens mount. It may not have been economical to pay for a new mount for the 18-55 lens, but it may make sense for either the 10-22 or 17-85 EF-S lenses.
But even if you can get an EF mount on the EF-S lens, what about the fact that the EF-S lenses have a shorter back focus than the EF lenses? You risk the mirror hitting the rear of the newly modified EF-S lens and causing damage to the camera and/or lens, no? ???

[CyberDyneSystems]

I think we decided that the mirror issue is not a concern for the 10D,. as the 10D does use a smaller "1.6X" shutter/mirror assembly than full frame. The only thing that physically prevents the use of EF-S on the 10D is the lack of the actual EF-S mount..

This at least seems to be the consensus. Thus the hacked lenses work fine on the 10D.

The Cameras that use full frame mirror shutters are the 1Ds and the 1D "classic" (I'm almost 100% sure of this about the 1D,. but could be wrong.. though the original 1D was a 1.3X sensor I seem to recall that the shutter/mirror etc was using some full frame 35mm parts?)

[louiseo]

I tried the hack today and had no problems. I am using a 10D with an 18-55 EFS lens I picked up cheap before I realized it didn't work on a 10D. The pictures look fine and the autofocus works fine. I took several test shots with the EFS and my 28-135 USM IS EF lens. The pictures are very similar. I think the 28-135 picture quality was better but I'm not sure whether that is because it is a better lens to begin with. The only problem I noticed is that the camera thinks the EFS lowest apeture setting is 4.5 rather than 3.5. Any ideas on why that would happen?

[slin100]

The only problem I noticed is that the camera thinks the EFS lowest apeture setting is 4.5 rather than 3.5. Any ideas on why that would happen?
The 18-55 is a variable-aperture lens. It can only do f/3.5 at or close to 18mm.

[louiseo]

OK. Thanks for the help.

[pwell]

Why hack the 18-55 ? Why the hack not ??

[Obtong]

Hi, I'm new to this forum. I too have a Canon 10D and would like to use those EF-S lenses. Has anyone tried to replce the lens mount on the 10D *body* with a EF-S lens mount?

[defordphoto]

Hi, I'm new to this forum. I too have a Canon 10D and would like to use those EF-S lenses. Has anyone tried to replce the lens mount on the 10D *body* with a EF-S lens mount?

The mount is exactly the same. The diff is the space between the the back-end of the lens and the internals of the camera. What you're suggesting is impossible.

[Obtong]

I figued as much. The fix sounded too easy to be true!

Thanks Jim

[stk]

Well, changing the mount on the other hand *is* really easy, at least as far as the 18-55 is concerned. I did it myself last week (using the epoxy method to preserve the inner ring which protects the rear element) and I didn't have any problems with my D30.