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Input:
Question: Does this extender fit the Canon Rebel T5i?  I'm hoping it does; however, I'm concerned about the reduction in image size.   Any info appreciated!
Document: The Canon EPEX15 II Eyepiece Extender works very well for me. I wear glasses, and when I first got my Canon EOS Rebel XSi DSLR I found that when trying to see the whole image in the viewfinder, my nose was scrunched against the LCD screen, smudging it continuously. Other reviews I've read said the Extender didn't work, or did nothing but decrease the size of the VF image by 30%. For me that is perfect.
This  is the Correct Eyepiece Extender for a Canon Rebel EOS XS. the EP-EX15 will not fit the XS.
The extender IS a genuine Canon product as pictured, and packed in a genuine Canon box. After reading all the reviews, I HAD intended on removing the "guts" like reviewers recommended. However, when I put the extender on the camera - I decided it was not loosing any appreciable view, so have opted to leave it together for now.I do believe it's good at helping keep your nose and face away from the camera ~ hence I'm VERY pleased with my purchase.
I wear glasses and I have oily skin. Without this extender, my nose would smudge against the LCD and leave oily streaks all the time. With this little jewel, my nose  stays well clear of the glass. The image is slightly smaller than the original but also seem a bit brighter. The smaller size image doesn't bother me. For those it does, there is also an modification you can make so the glasses in the extender is removed.
The eyepiece extender is easy to connect to my T2i. It virtually eliminates the effects of pressing my nose against the LCD screen. I did remove the inner optics by easily unscrewing two screws and then removing the optics and the thin metal retainer. Why did I remove the optics? I found them difficult to adapt to and they changed the viewfinder image from true to not quite true in size. Overall, this product is well worth the money and the shipping was speedy and well packaged.
It works great! I have a Canon XSI and I wear glasses but I couldn't see the whole frame unless I took my glasses off. So I was either framing too high or low because I couldn't see the edges. With the eyepiece I'm able to see all four sides and the exposure meter at the bottom. Yes it reduces the overall size of the frame as seen through the eyepiece, but it's a small price to pay to be able to frame your shots correctly.
the description for this part and some reviews state it fits canon full frame cameras.IT DOES NOT.it will fit and work well with a rebel series camera.you also need to remove the sandwiched lens to keep the same perspective.it is well packed and well made.it would be great if canon produced 1 for full frame cameras. this is not it.
The only thing I didn't like about my new Canon t2i was the fact that I would often smudge my display screen with my nose while using the eye piece. Problem solved! It took me roughly 30 seconds to install this product and it looks great and works perfect. I couldn't be happier. Also, some have noted the needed to remove the extra eye piece lens, however I find that I like it since I now don't have to have my eye pressed to the eye piece to see what I'm shooting.
The first time I took a picture with my Canon XS, I said "I'm not liking the nose touching the LCD screen". I knew I had to find a solution. After seeing an Amazon suggestion, I knew I found it. Unfortunately, I purchased the wrong one! So here's the warning for anyone with a Canon Rebel XS:Buy the EP-EX15 Ii for the EOS Rebel Series! THere is a version for non-EOS Rebel cameras. Anyone want to buy it for $10?
If you wear glasses (I do) and use one of Canon's DSLR's this accessory will fit....run...don't walk....to your computer and order this outstanding eyepiece extender. It was a snap to install and gives me the freedom to keep my glasses on while shooting without smudging up the rear of the camera (a T2i in my case). I'm very happy with my purchase.
Answer: I'm not sure if the eyepiece on the T5i is the same as the T2i or not. so I don't know if it would fit or not.  You might give Canon support a call and find out through them.  I'm certain that there are those who have taken this extender apart and removed part of the lens in the extender thus eliminating the reduction in image size.  I use mine coupled with two other eyepiece extensions that had rubber eyecups because I have a screen cover that pops up so by removing the original rubber eye cup and then installing the EP-EX15 extender and then attaching another eyepiece extension with the rubber I cup removed and then adding another eyepiece extension with the rubber eye cup to that one it gets the rubber cup back to the end of my cover when opened.  The rubber cup also rotates so it works for right or left eye use.  I use this combination all the time, day or night, without removing any lens from the extender and don't really notice the reduction in image size.  Works great on the T2i. If you do not have the flip up screen cover you would not need the last two extensions.  Each of these extensions are about 1 inch in length including the large rubber cup.  I did remove the rubber cup for the middle extension which does shorten that one by about 3/8 of an inch.  If the T5i has the sensors that turn the screen display off when you get your eye close to the eyepiece you might want to consider whether it affects the function of those sensors due to the rubber eyecup placement.  The way I have mine setup it does not affect that.