rcarol

Canon EF-S lenses will not fit on this camera. That is not necessarily true for third party EF-S lenses.

travisdeland Loc: deland, FL

That Sigma 10-20mm DC(C for crop) lens is a crop sensor lens, or designed for EF-S

jeep_daddy Loc: Prescott AZ

Time to upgrade your lenses now that you upgraded your camera body. Don't buy 3rd party lenses. Now that EF lenses are not going to be produced and no new EF lenses will be designed, the prices should come down and used EF Canon lenses should be available and cheap. I'm kind of bummed because I have a $7000 EF 500mm f/4 lens that I had hoped to recoup some of my investment from by selling some time down the road, but it will probably not have much value and I will not recoup much of my investment. Oh well, I sure had/have fun with my expensive EF Canon lenses. Maybe I'll never upgrade to mirrorless and stay with what I have.

rcarol

Has Canon made the decision to no longer produce EF lenses? I knew that they have decided to kill all new designs but I was not aware they were discontinuing manufacture of existing designs.

CHG_CANON Loc: the Windy City

They've been discontinuing lenses for a year+ now. Every time the corresponding RF model is released, the EF model goes out of production.

robertjerl Loc: Corona, California

And after they start wondering why overall lens sales are down they may reconsider, if Tamron and Sigma etc. haven't taken over their market for lenses for the dslr bodies. There are a LOT of dslr's out there that need more lenses as their owners improve or change picture styles and need different lenses - which since the RFs don't have an adapter to work on EF/EFs bodies means finding used Canon's or a third party lens. The image quality of the new RF bodies isn't really much different than the older EF/EFs bodies and a lot of consumers will not be happy if they find that in order to change photo styles and get those other lenses they want they have to buy a different multi thousand dollar body and a whole new set of multi thousand dollar lenses.

CHG_CANON Loc: the Windy City

That kind of logic would have Canon still looking up at Nikon, rather than the undisputed #1 global leader in photography for 20+ years.

DeanS Loc: Capital City area of North Carolina

DX mount is for crop body cameras.

CHG_CANON Loc: the Windy City

Just to clarify:

The Nikon F-mount is universal for full frame (aka FX) and cropped Nikon bodies (aka DX). This differs from Canon's approach where the cropped bodies have a unique EF-S mount for unique EF-S lenses, while retaining their universal EF mount for EF lenses.

But, third-party lenses use the EF mount, even for lenses designed specifically for the Canon cropped sensor bodies. Where many full-frame Nikons can detect a DX lens and automatically crop the image to match the smaller image circle, Canon's DSLRs do not have this feature.

The new Canon mirrorless full-frame bodies will properly detect and crop a Canon-brand EF-S lens. But, the third-party EF-mount lenses will need the photographer to configure the EOS-R body to crop the image from the sensor.

uhaas2009

Yes it is. But DX on Nikon lens is automatically small frame sensor. The beauty Nikon have it written on the lens......😉

uhaas2009

I’m sure like Nikon you can change the camera to DX and still use the lenses you have, but you will loose some of the size of the picture.....

amfoto1 Loc: San Jose, Calif. USA

Your T1i has an APS-C size "crop" sensor that measures approx 13x21mm.

Your new Canon 5DIV has a larger "full frame" sensor that measures 24x36mm.

The Sigma 10-30mm and Tamron 18-270mm lenses are designed specifically for "crop sensor" cameras like your T1i. The image circle they produce is simply not large enough diameter to cover a full frame sensor.

The only lens you have that's full frame compatible and will work properly on your 5DIV is that EF 50mm f/1.8. That lens is designed for full frame, with a larger image circle that will completely cover the larger sensor.

In fact, any of the many Canon "EF" lenses can be used on your 5DIV, but nNOT any of the Canon EF-S, EF-M or RF lenses.

All Sigma "DC" lenses are crop only. The same with all Tamron "Di II" lenses. They'll fit onto, but won't work properly on your 5DIV.

However both do make full frame compatible lenses to fit Canon: Sigma "DG" and Tamron "Di". Either of those types "for Canon" will work fine on your 5DIV.

A couple more types of lenses you need to avoid are Sigma "DN" lenses and Tamron "Di III". Those are designed for mirrorless cameras, though AFAIK none are being made that will even fit Canon DSLRs like either of yours.

Tokina is another popular lens maker. Their "FX" and "FF" lenses "for Canon EF" will work fine on your 5DIV. Their "DX" and "CF" lenses are "crop only" designs, so while the ones "for Canon" will fit onto your 5DIV, they will not work properly.

LFingar Loc: Claverack, NY

There is only one mount used on full frame and crop sensor Canon DSLRs, the EF mount. There is no EF-s mount, but, there are EF-s Canon lenses. The construction of the EF-s lenses causes interference with the body of the full frame Canons and prevents mounting of the lens. A protrusion on the rear of Canon's EF-s lenses is the culprit. So far as I know, the only reason for the protrusion is to prevent mounting on full frame bodies. Sigma and Tamron don't have the protrusion on their APS-c format lenses. The lenses will mount on full frame Canons but will produce vignetting such as you are experiencing.

DeanS Loc: Capital City area of North Carolina

Canon EF-S lens will mount to Canon RP and R5 bodies, switching automatically to crop mode in the camera. Non-Canon lens, you have to manually switch the camera to crop mode.

LFingar Loc: Claverack, NY

The EF/RF adapter must be used, as I am sure you know. With it any Canon EF-s lens will mount on any Canon R Series body, not just the RP and R5.