RPaul3rd Loc: Arlington VA and Sarasota FL

I have a full frame Canon 5D, Mark III and a couple of CMOS Canon cameras (D70 and SL2). I may have misinterpreted the article but I read that it is unwise to try to use the FF lenses on the CMOS camera. The article I read some time ago talked about all sorts of possible problems, not the least of which is not getting the image I see through my viewfinder on the CMOS device. Any suggestions and comments would be welcome.

TriX Loc: Raleigh, NC

I think you probably mean “crop” or APS-C cameras instead of CMOS (all of your 3 cameras have CMOS sensors). Canon EF series lenses will work fine on all 3 of your cameras. The field of view will be smaller on the 2 crop bodies, but the viewfinder should give you an accurate image. Btw, it’s a 70D in the Canon world - the D70 is a Nikon.

Cheers and good luck.

Longshadow Loc: Audubon, PA, United States

RPaul3rd Loc: Arlington VA and Sarasota FL

Its late and I need some sleep. Thanks for the clarifications.

robertjerl Loc: Corona, California

The two main things you may notice using EF mount/FF lenses on EF-S crop sensor/APS-C cameras is the images of the APS-C cameras will look like you are using a longer lens on the FF. A 100 mm lens made for FF will give the angle of view of a 160 mm lenses on the APS-C camera. The other thing comes from that, because the APS-C sensor is only using the center of the image circle thrown by the FF lenses the images will be sharper overall with no softness in the corners. Now that doesn't matter if the FF lens is one of the great ones without softness in the corners. But if it is only a good FF lens then suddenly the images you get will be great when used on APS-C bodies - but of course the lens is bigger and heavier than the EF-S lenses made for APS-C cameras. Trade offs everywhere.
I have a FF and two APS-C bodies also (5DIV, 80D & 7DII), all of my lenses are for FF. My wife and daughter both have APS-C cameras and I did get them a mix of EF and EF-S lenses. But in general they are not Image Quality freaks like I am. They just want good pictures.
Caution the Canon EF-S mount lenses will not mount on a FF Canon body with EF mount. They built that way for a reason. But the APS-C bodies with their EF-S mounts can take both types of lenses safely.

Architect1776 Loc: In my mind

Every EF lens ever made work perfectly with your cameras.
That is the beauty of Canon is the compatibility.

jcspics

I have two Nikon crop frame cameras and love using FF lenses on them. In fact I only have one crop frame lens and it was a kit lens and every other lens is a full frame lens. The Nikon D7200 body has a focus screw that works with my older Pro lenses so that might be the only reason to use crop lenses that I can think of.

-Jim

Architect1776 Loc: In my mind

That is not an issue with ANY Canon camera. They ALL use ALL EF lenses ever made with 100% compatibility.
That includes the FF and APSC as well as the M series and all the new mirrorless. So that old original 20-35mm lens from the beginning will work with them all including the new RF mount cameras 100%.
Pretty sweet.

jcspics

I'm sorry I guess I didn't understand the issue from the original post buddy... I wish that was the case with my gear!

All the best!
Jim

Blair Shaw Jr Loc: Dunnellon,Florida

RPaul3rd Loc: Arlington VA and Sarasota FL

Your responses have been great and I thank you. You read and learn.

Blenheim Orange Loc: Michigan

EF-S lenses cannot be used on Canon FF cameras, such as the 5D. However, EF lenses can be used on the crop sensor bodies, such as the 70D and SL2.

Mike

speters Loc: Grangeville/Idaho

What you mean is APS-C cameras, not CMOS (the 5D M III is a CMOS "camera"), or I should say camera with an CMOS sensor! And while the reverse is quite true, to avoid using crop sensor lenses on full frame cameras, it is completely fine to use full frame lenses on "crop sensor cameras"!

Architect1776 Loc: In my mind

No reason to mount the EFs on a FF camera, they don't cover the sensor.
Also they go in deeper and some will hit the FF mirror.
They will mount and work though on the RF mount FF cameras though. So all your EF and EFs lenses work just fine on the RF mount. Again pretty sweet.

PHRubin Loc: Nashville TN USA

Welcome to UHH!

Actually, Canon lenses made for APS-C cameras (EF-S type) will damage a Full Frame (FF) camera. However, lenses made for APS-C cameras from other vendors won't. But you will find that they will cause vignetting, or darkening of the photo corners because they are designed for a camera with the smaller APS-C sensor.