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My only question was about the inference of “ ... even if there was an adapter...”.

That in itself seems strange given that the lenses actual already fit without any adapter. Unless acoarst they were Nikon mount but I could find no definite mention about that. So, the two posts in a row mentioning adapting just didn’t add up.

Anywho they ARE direct fit EF mount lenses, no adapter needed, ignoring that yes indeed they are a verrrry poor choice even though he already owns them, and even though they’d still deliver 25MP if need be.

Obviously Canon has no reason to provide automatic cropping to APSC lens since they make sure that you can’t fit their own EF-s lenses onto an EF body. They’re just so darn thoughtful like that :-/

robertjerl Loc: Corona, California

If it only has one number: 135, 35, 50, etc it means it is a prime lens with only that focal length.

All the zooms are identified by two numbers with a dash in between to show the wide end and the long end of the zoom range, just like the two you have. And the lenses made for Canon FF (EF mount) cameras will work on FF or Crop Sensor bodies but not the other way around (EF-S mount) They will not even mount on a Canon FF body-the lens has an extra tab on the mount to prevent it because the rear element of a Canon EF-S lens can touch the mirror when you take a picture and cause damage to both the body and the lens.

Your Sigma and Tamron lenses (both made for APS-C/crop sensor bodies) will mount because the third party makers only use the EF mount. But their lenses are made so the element and mirror will not touch, at least all the ones I have owned would not touch. However at the wide end of the zoom range the image circle will not fill the FF sensor. Here is a picture taken with a Tamron 10-24 set at 10 mm made for use on Canon crop sensor bodies mounted on a Canon 6D FF body. The second picture was with the zoom at 14 mm, from here to 24 mm this lens will work on the 6D. Other crop sensor lenses will have similar results.

Your 5DS-R is an extremely good high definition camera. If you want to see outstanding examples of what one can do then look at the posts of UHH user Regis, especially his eagle and other raptor shots.

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Yowza ! That 4mm difference has quite an influence in the weather !

Nanarozzi Loc: Brentwood, TN & East TN

I have a Canon 5D IV and purchased a Canon 16-35mm F4 Lens and it works well with my camera and didn’t cost as much as my other L lenses. There are other Canon 16-35mm L lenses, but for as much as I use a landscape lens it was the perfect choice for me. I’m pleased with having it for my wide angle choice. I only use it for landscapes. If I used it for other things maybe the Canon 16-35 2.8 would have been the better choice but I LOVE my Canon 24-70mm 2.8 II L and my Canon 70-200mm 2.8 II L lenses and use them most of the time for everything.

Good luck with whatever you choose! I suggest renting whatever you are thinking about buying before you buy it. Renting lenses before purchasing has saved me lots of money because if I had purchased some that I rented, I would have wasted lots of money on lenses I would never have been happy with. But by renting lenses, I discovered it also cost me more money because the lenses I liked were not inexpensive. In summary, after I rented and purchased what I liked I haven’t desired any new lenses because I loved the ones I have.

mwsilvers Loc: Central New Jersey

That was my fault. I misspoke. People are always asking about use Canon crop lenses with Efs mounts on full frame Canon DSLR cameras. They will not mount. Third party manufacturers of of crop lenses like Sigma and Tamron use Canon's EF mounts and they can be attached to Canon DSLR full frame bodies. They will use a smaller area in the center of the sensor and will vignette very badly. I believe the new Canon R series of mirrorless full frame bodies do have an adapter so EFs lenses can be used on them. Sorry for the confusion.

robertjerl Loc: Corona, California

I took the 10 mm shot to show what happens, then later that day decided to do a series at every marked focal length on the lens barrel and some weird things called clouds and even something called rain had come blowing in. (This is Southern California.)

Jrhoffman75 Loc: Conway, New Hampshire

A little off-topic, but for the OP - is there a reason you purchased a 5DSr? It is an extremely high resolution camera that should really only be used with L lenses.

What about the 80D required an upgrade?

bweber Loc: Newton, MA

I own a 5dsr that I use for everything. It is a great camera that produces wonderful images. However you will need "L" quite lenses to take full advantage of the sensor. Do not sell the 135 f2 lens. It is a fantastic lens particularly for portraits, although I use mine for some landscape work, in addition to portraits. I recommend the Canon 24 - 70 F4L as a walk around zoom lens or perhaps the 24 - 105 F4, if you need the extra range. The 24 - 70 is smaller and lighter and has Macro capacity.

BushDog Loc: San Antonio, TX

I agree with bweber. In particular, the amazing portraits you can get with the 135mm f/2.

imagemeister Loc: mid east Florida

Yes, I know you have a 150-600 - but, when you are tired of carrying that one - get the Canon 70-300 IS II nano and be HAPPY 8-) - OR- get the the new Tamron 28-200 2.8-5.6 for wider views !

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lbivins Loc: Green Valley, AZ.

I have a 5DS and love it. I have an Canon EF 28-135 that I use as my walk around lens. It is always on my Camera!

TriX Loc: Raleigh, NC

For wide angle lenses that are good enough in terms of sharpness not to compromise the 5DSr, here are a few suggestions (in order of descending price):

EF 16-35 f2.8L
EF 16-35 f4 L
EF 17-40L
EF 35 f2

All of these are first rate Canon manufactured lenses - there are certainly some good 3rd Party wides as well. In my opinion, forget the zooms with extremely wide (>3 or 4:1) zoom ranges - the compromises inherent in these types of lenses are going to be glaringly apparent on this high resolution body. And keep the 100 f2.8L & 135 f2L - both are excellent quality and entirely appropriate for this body.

PHRubin Loc: Nashville TN USA

True for DSLRs, not true for mirrorless.

tgreenhaw

I too have a 5Ds. My most used lenses are my Canon 35MM f1.4 and 100-400 MK2 zoom. I also use the 24-72 zoom and 85MM f1.4 lens but less often. I disagree with some of the opinions here that the 5Ds is overkill as I like to make large prints on aluminum. In order to take advantage of the resolution, you have to pair it with the best lenses possible. I also have a Canon 1.4 extender but almost never use it - the resolving power on my 5DS seems to be the same with or without it and I lose aperture.

PHRubin Loc: Nashville TN USA

The 5DS R is a high megapixel camera made for high resolution photos. The Sigma 18-300 and Tammy 18-400 are compromise lenses for great versatility at the expense of top-of-the-line image quality (IQ). As previously noted, these CAN be mounted to a 5DS R but you should expect vignetting at their wide settings. Only Canon brand EF-S lenses will not mount and can damage a full frame camera.

Since purists suggest the zooms of over 3 or 4:1 zoom ratio sacrifice too much image quality, the 24-70L is the 1st choice for top quality, but since you were satisfied with the Sigma 18-300, the EF 24-105 L or EF 28-300 L should be more than quality enough. Be advised they are heavier than the Sigma 18-300. You will also find Sigma 24-105mm f/4 DG OS HSM Art lighter and less expensive than the Canon with similar IQ.

I have not experienced the 5DS R but expect it makes the compromise of high ratio lenses more obvious.