Switching from a crop sensor to a full frame
Jul 22, 2019 08:33:30 #
LFingar wrote:
I went to B&H and looked at a picture of a current EF-s 10-22. That one has the protrusion. The protrusions look like a gray plastic ring. Perhaps yours is an earlier version that didn't have the ring, or you bought it used from someone who modified it, or, maybe the ring just fell off. Anyway, as I stated, there are exceptions to every rule and it looks like you have one in your gear bag!
Purchased used either local or KEH. Trust both.
Jul 22, 2019 09:33:31 #
rehess wrote:
Why would you want to mount EF-S glass on a full frame Canon body? There is over thirty years of great EF glass {‘bad’ EF glass is “just OK”} out there, and it won’t vignette.
Because one has it???
Jul 22, 2019 13:24:55 #
nadelewitz
Loc: Ithaca NY
CanonDude wrote:
According to Canon, EF lenses can be used on both ... (show quote)
Canons lenses say right on them EF or EF-S. There's no mystery here.
Jul 22, 2019 13:45:08 #
rehess wrote:
Why would you want to mount EF-S glass on a full frame Canon body? There is over thirty years of great EF glass {‘bad’ EF glass is “just OK”} out there, and it won’t vignette.
Use "quote reply" instead of "reply" so we know what you are replying to.
If you are wondering about the aps-c on a 6D stuff I put up. Well a few years ago this question of crop sensor lens on FF cameras came up (and does fairly regularly) and I ran the tests to see what would be the results. When ever the question comes up again I repost the series to show the questioner what the results are - you can get THIS aps-c lens on the FF body SAFELY. That is why I used a Tamron aps-c lens, they have the EF mount and will mount on a Canon FF body and Tamron designs their Canon aps-c lenses to avoid the danger of damage to lens and or mirror.
Some people "modify" their EF-S mounts to go on an EF camera and then have to be very careful to only use them in circumstances and settings that will not cause damage. Why???? Ask them, I don't do that and don't know why they do.
Jul 22, 2019 15:55:25 #
robertjerl wrote:
Use "quote reply" instead of "reply... (show quote)
Just to clarify, while there are EF-s lenses, there are no EF-s mounts. All Canon EF and EF-s lenses use the same mount, the EF. The modification to allow EF-s lenses to mount on FF bodies consists of the removal of the rear protrusion Canon builds into its EF-s lenses to prevent mounting on FF Canon DSLRs. Third party lenses do not have the protrusion and will mount as is. As noted in a previous discussion, there are one or two Canon EF-s lenses that will mount on FF bodies. Apparently they lack the protrusion for some reason.
Jul 22, 2019 16:44:32 #
LFingar wrote:
Just to clarify, while there are EF-s lenses, ther... (show quote)
OK, so the EF-S mount is a modified EF mount. The point is that it is modified and that in effect makes it a different mount as far as I and most people are concerned.
In the store I have heard them tell someone looking at a lens that "This is an EF-S mount lens, it will not fit your full frame EF mount body."
Jul 22, 2019 17:17:13 #
robertjerl wrote:
OK, so the EF-S mount is a modified EF mount. The point is that it is modified and that in effect makes it a different mount as far as I and most people are concerned.
In the store I have heard them tell someone looking at a lens that "This is an EF-S mount lens, it will not fit your full frame EF mount body."
In the store I have heard them tell someone looking at a lens that "This is an EF-S mount lens, it will not fit your full frame EF mount body."
The mount is identical except for the white dot instead of a red one. I've compared them. The store was correct. An EF-s lens will not mount on a full frame but it is because of the lens construction, not the mount. The protrusion on the rear of an EF-s lens prevents the two halves of the mount from even coming into contact on a FF body. EF-s lenses can be modified by removal of the rear protrusion and will mount on a FF with no problem. MTShooter mentioned doing that in a posting quite some time ago. Another easy way to check is that the new EF-RF adapter uses the same female half of the EF mount as does my 5DIV and every other Canon DSLR. The configuration of the mount is identical to my 5DIV and yet both EF and EF-s lenses will mount on that adapter with no problem. Then there is this:
https://www.usa.canon.com/internet/portal/us/home/products/details/cameras/eos-dslr-and-mirrorless-cameras/dslr/eos-7d-mark-ii
Go to 'Specifications', then 'Type' and see what is listed as the lens mount, as it for for all of Canon's APS-C bodies. There is no EF-s mount, no matter how many people state that incorrectly, only EF-s lenses.
Jul 22, 2019 19:32:49 #
LFingar wrote:
The mount is identical except for the white dot in... (show quote)
Doesn't matter what the specs say or don't say, or what a techy would say or not say. It is the common usage that would be understood by most people.
Two examples:
#1 "Canon EF-S lens mount - Wikipedia
https://en.wikipedia.org/wiki/Canon_EF-S_lens_mount
The Canon EF-S lens mount is a derivative of the EF lens mount created for a subset of Canon digital single-lens reflex cameras with APS-C sized image sensors. It was released in 2003. Cameras with the EF-S mount are backward compatible with the EF lenses and, as such, have a flange focal distance of 44.0 mm..."
#2 "Canon Lenses Compatibility Guide - Tech Guide For Lenses - Canon ...
https://www.canon.ie/lenses/tech-guide/compatibility/
If you see a red circle on the lens mount your camera will accept EF lenses. ... Owners of EF–S mount cameras have access to a complete offering of lightweight ..."
Opps, that is from a Canon site - guess they are wrong?
Jul 22, 2019 20:13:05 #
robertjerl wrote:
Doesn't matter what the specs say or don't say, or... (show quote)
Who is wrong???
Red dot is EF and white dot is EF-S.
My APS-C body has both color dots;
My 50mm EF lens has a red dot;
My APS-C zoom has a white dot.
Look at a 5D and you will only see a red dot on the body.
Jul 22, 2019 20:44:50 #
Longshadow wrote:
Who is wrong???
Red dot is EF and white dot is EF-S.
My APS-C body has both color dots;
My 50mm EF lens has a red dot;
My APS-C zoom has a white dot.
Look at a 5D and you will only see a red dot on the body.
Red dot is EF and white dot is EF-S.
My APS-C body has both color dots;
My 50mm EF lens has a red dot;
My APS-C zoom has a white dot.
Look at a 5D and you will only see a red dot on the body.
If you read the whole thread you would know what you are commenting on. And it isn't about red dots and white squares.
It is about the mounts, I say EF-S is a mount type. Derived from and is a modified EF mount. Both the lens mount and the body mount are modified/slightly different from the EF.
LFingar says there are only EF mounts. The modification doesn't count as a different type of mount.
Jul 22, 2019 21:01:15 #
robertjerl wrote:
If you read the whole thread you would know what you are commenting on. And it isn't about red dots and white squares.
It is about the mounts, I say EF-S is a mount type. Derived from and is a modified EF mount. Both the lens mount and the body mount are modified/slightly different from the EF.
LFingar says there are only EF mounts. The modification doesn't count as a different type of mount.
It is about the mounts, I say EF-S is a mount type. Derived from and is a modified EF mount. Both the lens mount and the body mount are modified/slightly different from the EF.
LFingar says there are only EF mounts. The modification doesn't count as a different type of mount.
Sorry, read the whole thread and still missed it. From the post I asked about, I thought the references were regarding the dots and lens compatibility.
Since they are not completely interchangeable, I'd call them different mounts. One is EF and one is EF-S. One is backward compatible, the other not forward compatible.
Jul 22, 2019 21:05:34 #
robertjerl wrote:
Doesn't matter what the specs say or don't say, or... (show quote)
Yes, in common usage it is well known that MOST EF-s lenses will not mount on FF Canon bodies. It is also considered 'common knowledge' that the reason is because of the mount. It's not. In the first place, it makes no mechanical sense that the mount on one type of lens would work with the mount on two types of cameras but the mount on another type will work with only one camera. Tell me how you would build something like that. Give it some thought. You can't do it. Besides that, the RF-EF adapter proves beyond a doubt that the mounts are the same. Compare the EF side of the adapter to the mount on any Canon crop sensor or full frame and you will find that all 3 are mechanically identical. EF-s lenses will mount on the adapter solely because being a spacer it provides the room necessary to negate the effect of the protrusion on the EF-s lenses.
But, have it your way. I'm not going to waste my time arguing with someone who doesn't understand mechanics. PM me when you have your drawing of how that mount works in your mind.
Jul 22, 2019 21:26:44 #
Jul 22, 2019 21:57:56 #
LFingar wrote:
... it makes no mechanical sense that the mount on one type of lens would work with the mount on two types of cameras but the mount on another type will work with only one camera. Tell me how you would build something like that.
...
...
... it makes no mechanical sense that the mount on one type of lens would work with the mount on two types of cameras but the mount on another type will work with only one camera. Tell me how you would build something like that.
...
...
Easy.
They could put a key way in a flange. The lens with the key will only fit on the mount with the key way in the flange. A lens without a key will fit either flange.
Jul 23, 2019 01:55:11 #
Longshadow wrote:
Who is wrong???
Red dot is EF and white dot is EF-S.
My APS-C body has both color dots;
My 50mm EF lens has a red dot;
My APS-C zoom has a white dot.
Look at a 5D and you will only see a red dot on the body.
Red dot is EF and white dot is EF-S.
My APS-C body has both color dots;
My 50mm EF lens has a red dot;
My APS-C zoom has a white dot.
Look at a 5D and you will only see a red dot on the body.
White dot is EF-M not EF-S. EF-S is a white square.
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