pmorin Loc: Huntington Beach, Palm Springs

I used a crop camera for a couple years and still do for certain types of shooting. The full frame lens works just fine on the aps-c cameras. I bought a used EF 16-35mm f/2.8L USM for $600 at B&H some time ago and it has enough wide angle for any of my uses. I looked up the lens on line and Adorama has one for about $700. Link:
https://www.adorama.com/us%20%20%201120584.html?utm_medium=cpc&utm_source=adl-gbase

The main reason I had gotten the 16-35 is because of the crop sensor, the 16 mm end gave me the width that I wanted. Now that I also have a FF, that lens is usable for both.

Robyn H Loc: MainLine PA

I rarely see posters on a photography oriented site get the model of their camera wrong, rarely. But according to you, it's most common. Obviously we see things differently. I didn't say anything about not understanding the question. That's you putting words in my mouth. I said it's hard to take the QUESTION seriously. I did NOT say it was hard to take the poster seriously as some have implied.

robertjerl Loc: Corona, California

I said "transpositions" in typing - like the 6Ti vs T6i are very common.
And I see a lot of model numbers wrong here on the UHH and other photography sites I frequent where everyone is not a pro (and I have seen pros type the model # wrong also).

I can take a question seriously when someone makes a mistake - but I had 34+ years of practice in the classroom at Jr and Sr High level.
The question and the answer are the first priority and the typing/spelling/model # error are just part of the package and secondary to the question. I had a lot of students say "Why are you worried about it, you are my history teacher, not my English teacher."

lsaguy Loc: Udall, KS, USA

I don't know what your financial situation is but you might like to try what I do. Go to KEH in their lens section and put in the correct mount for your camera. Now go to the bottom of the list and see what's available cheap. No, you probably won't get great quality glass, although you could get surprised, but if you're considering say a 24mm prime you can buy a cheap lens and try it out to see if it has the field of view you're after. Once you know what you like you can start saving for the Canon L series of that focal length. That's how I learned that a 105mm is what I want for macro work. It's a Goldilocks decision for me; 135 mm is a bit long but 80 mm seems a bit short. Total cost to learn that? $40, and I have two nice lenses that will be better than I am as a photographer for some time to come. I can't rent that cheap and I can experiment with them any time I like while my pennies pile up.

Robyn H Loc: MainLine PA

Yes, we all know you were a teacher, you've mentioned it many, many times. Even more than once in this conversation. Since you were a teacher, go back and analyze what I said. I did not say I didn't take the OP seriously. I didn't even say I didn't take the question seriously.

nadelewitz Loc: Ithaca NY

A 35mm lens on your Rebel crop-sensor camera will give the field of view of a 56 mm lens, in the "normal" range. Not wide-angle at all.
If you want a wide-angle field of view on your camera, you need a lens of 22mm. or lower focal length. That would give the equivalent f-o-v of a 35mm on a full-frame (or film) camera. 35 is the "beginning" of the wide-angle range.
Lens focal length X 1.6= the equivalent field of view on a full-frame or film camera. On Nikons the crop factor is 1.5.

Robyn H Loc: MainLine PA

I recommend you get a lens Canon intended for your situation, the Canon EF-S 18-135. Unlike FF lenses, it's made for crop sensors. Another good choice is the EF-S 18-200. I have both lenses and use them on my Rebel bodies all the time. They are quite versatile and are quite capable of creating excellent images.

nadelewitz Loc: Ithaca NY

There is no pro or con of using a full-frame (Canon EF) lens on a crop-sensor (like the Rebels) camera.
Like I said previously, you just have to consider the crop factor to know what effective field-of-view you will get. This is true for ALL lenses, full-frame (EF) or crop-sensor (EF-S).
And....looking at Canon brand lenses, an EF will probably be more expensive than an EF-S with same focal length.

amfoto1 Loc: San Jose, Calif. USA

Full frame design lenses work fine on an APS-C camera like your Rebel T6i (not "6Ti").

What you can't do is use a lens designed for crop cameras on a full frame camera (like the Canon 6D-series or 5D-series). Those lenses don't produce large enough image circle to completely cover the larger sensor in the camera.

Lens focal length doesn't change... 50mm is 50mm, 35mm is 35mm, etc.... regardless of what format of sensor or film it's used on.

What changes with different sizes of sensors (or different film formats) is how any particular focal length "behaves". For example, on a full frame (or 35mm film camera) a 50mm lens such as you have acts as a "standard" or "normal" lens... it's not a wide angle or a telephoto. But if you put that same 50mm on a camera with a smaller sensor, like your T6i, that lens will "act like" a short telephoto lens (great for portraits!) In fact, some digital cameras use much smaller sensors, where the same 50mm would be a quite powerful telephoto. And, conversely, on a "medium format" digital or film camera with senaros larger than "full frame", the same 50mm would "act like" a wide angle lens.

For proof that a "full frame" lens will work fine... you're already using one on your camera! All Canon 50mm are "EF" lenses, which designates that they are full frame capable designs. Canon "EF-S" lenses are the ones designed for use only on APS-C cameras. Your camera can use both EF and EF-S lenses equally well (while a full frame 6D or 5D can only use EF lenses).

You mention considering a 35mm focal length lens. While that's closer to a "normal/standard" lens on your camera than a 50mm lens, a 35mm lens will still be slightly telephoto. A 30mm lens would be better choice (Sigma makes one). Or a Canon 28mm f/1.8 USM might be a good choice and is a fairly compact lens, although it's not as small and light as the 50mm f/1.8 (which I assume you are using).

If you really want a 35mm lens, Canon actually makes several:

- EF-S 35mm f/2.8 IS STM Macro ($300) is a macro lens for AP-S crop sensor cameras only, with a built in LED illumination. Frankly, this is a very short focal length for macro shooting, if that were what was wanted. At closest focus (full 1:1 magnification), the front of the lens is only slightly over one inch from the subject. This limits using a short focal length macro lens with a lot of tiny live subjects... bugs and such. It can serve for non-macro purposes, too, though it's f/2.8 aperture makes it 1 to 2 stops slower than some non-macro options. It's also likely slower auto focusing than some of the alternatives (macro lenses in general focus slower.... plus this lens uses STM focus drive, which is pretty good, but not Canon's fastest). Detailed review of the EF-S 35mm STM Macro here: https://www.the-digital-picture.com/Reviews/Canon-EF-S-35mm-f-2.8-Macro-IS-STM-Lens.aspx

- EF 35mm f/2 IS USM ($549 + $45 separately sold lens hood) is a non-macro lens and a top performer for both full frame and crop cameras. It's a full stop "faster", as well as larger and heavier than the lens above, though not as hefty as some of the alternatives (see below). It uses Canon's USM focus drive, which is their fastest type. Detailed review: https://www.the-digital-picture.com/Reviews/Canon-EF-35mm-f-2-IS-USM-Lens-Review.aspx

- EF 35mm f/1.4L II USM ($1699) is a high-end, premium quality "L-series" lens that's another stop faster, as well as larger, heavier and considerably more expensive. This is a pro-oriented lens with robust built, extra sealing for weather resistance and more. Review: https://www.the-digital-picture.com/Reviews/Canon-EF-35mm-f-1.4-L-II-USM-Lens.aspx

If you shop used, you'll also find some discontinued Canon lenses:

- EF 35mm f/2 (approx. $200-250) was offered for many years, so is pretty easy to find. It's a relatively small, lightweight lens that uses more primitive "micro motor" auto focus drive that's slower and noisier than STM or USM. Review: https://www.the-digital-picture.com/Reviews/Canon-EF-35mm-f-2.0-Lens-Review.aspx

- EF 35mm f/1.4L USM (approx. $800-900) is the first version of the premium L-series lens mentioned above. Review: https://www.the-digital-picture.com/Reviews/Canon-EF-35mm-f-1.4-L-USM-Lens-Review.aspx

As I mentioned above, while there's some difference between them, 50mm focal length you have and 35mm focal length you're considering are pretty close together. If those are the only/primary lenses you'll have to use, I'd recommend going to a 28mm at least, or maybe even 24mm... both of which act as slightly wide normal lenses on an APS-C camera like yours. A couple Canon lens options:

- EF 28mm f/1.8 USM ($509 + $25 lens hood sold separately)... This is a lens I've used for a number of years... very often on crop cameras. I bought it used for a lot less that it sells for new and really like it... It has very very good image quality, especially on crop cameras that only use the sharpest central portion of the frame. It's the fastest of Canon's 28mm and faster than most of their 24mm options. It's well built with fast/quiet USM auto focus drive. Even with it's matched hood, it's relatively compact. Review: https://www.the-digital-picture.com/Reviews/Canon-EF-28mm-f-1.8-USM-Lens-Review.aspx

- EF 28mm f/2.8 IS USM ($499 + $45 lens hood sold separately)... A newer lens with Image Stabilization added, but over a stop "slower" than the 28mm lens above. Review: https://www.the-digital-picture.com/Reviews/Canon-EF-28mm-f-2.8-IS-USM-Lens-Review.aspx

- EF 24mm f/2.8 IS USM ($549 + $45 lens hood sold separately)... Another relatively new lens with IS added, similar to the 28mm IS listed above. Note that this and the other affordable 24mm are all f/2.8 lenses, a stop or more slower than the 35mm f/2, 28mm f/1.8, 50mm f/1.8 lenses. Still, f/2.8 is pretty good. Check out the review here: https://www.the-digital-picture.com/Reviews/Canon-EF-24mm-f-2.8-Lens-Review.aspx

- EF-S 24mm f/2.8 STM "Pancake" ($129 + $20 lens hood sold separately).... This is a crop-only lens (fine on a T6i) and an ultra compact "pancake" design. To keep cost low, Canon omitted image stabilization and uses STM auto focus drive that's better than micro motor, but not as fast as USM. Note that it also has a very thin, difficult to use manual focusing ring and doesn't have a distance scale. But it sure is small! And affordable! Review: https://www.the-digital-picture.com/Reviews/Canon-EF-S-24mm-f-2.8-STM-Lens.aspx Note: Canon also offers an EF 40mm f/2.8 "Pancake" lens, but that would be short telephoto on your T6i, much like your 50mm lens.

There also are a couple 24mm f/1.4 "L"-series lenses (both pricey, one current and an earlier discontinued version). Plus there's a discontinued EF 24mm f/2.8 that used a micro motor focus drive, which might be found used if interested (Review of the latter: https://www.the-digital-picture.com/Reviews/Canon-EF-24mm-f-2.8-Lens-Review.aspx).

Hope this helps!

EDIT: Note that Canon "EF-M" and "RF" lenses are designed for use on their mirrorless cameras and CANNOT be used on DSLRs like you T6i.

mwsilvers Loc: Central New Jersey

I guess you have not been around here very long. It actually happens more often than you might think, usually from relative newbies, but sometimes not. Aside from that, I wish I had a dollar for every unintelligible post I've seen in the last several years from people who seem to be native English speakers. The ability to write readable prose seems to be beyond many people,. If I can't make out what they're asking I don't waste my time, but I try avoid throwing it in their face.

robertjerl Loc: Corona, California

You mean because you remember I have posted I was/am a teacher then that means that all people know it. There are new people on the UHH everyday. Do they get knowledge direct from you by telepathy?
Didn't take the question seriously? You sure did imply it.
Or were you bragging that despite it being hard you managed to do it?
And if so why did you not just answer the question and make the comment about getting the model # wrong as a minor part of your answer? You didn't take the OP seriously enough to answer the question. Instead you took a cheap shot for not getting the model # right. Did that make you feel better?
And yes hassling you is making me feel better. You keep changing your position and comments in response. Maybe I will get you around to admitting you took a cheap shot just because you could.
But, it won't be me. I have an appointment with my Vascular Surgeon to see the results of some tests and find out if he plans to any remodels or upgrades on me.

mwsilvers Loc: Central New Jersey

The OP actually never mentioned wanting a wide-angle lens. He indicated he currently uses a 50 mm lens on his crop sensor camera and was considering a 35 mm lens to go wider, which it does.

nadelewitz Loc: Ithaca NY

So isn't a 35mm lens a wide-angle lens?
Yes, a 35 would be wider than his 50. My whole point was that on his crop-sensor camera, 35 doesn't give a wider-than-normal field of view.

mwsilvers Loc: Central New Jersey

Agreed. But in your earlier post when you say, "A 35mm lens on your Rebel crop-sensor camera will give the field of view of a 56 mm lens, in the "normal" range. Not wide-angle at all".

The "not wide-angle at all" gave me the distinct impression that you thought the OP was looking for a wide-angle lens to use in addition to his 50 mm.

speters Loc: Grangeville/Idaho

The 50mm lens you are currently using is for full frame!