Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Does this work with the t4i?
Document: I'm really excited for this viewfinder. It does not have a diopter, so if you don't have good vision, you will need to buy one of the more expensive ones; however, if you have good vision (and I'm assuming it would work for those with contacts, too), then this is a great LCD viewfinder. It works perfectly with my Canon T5i, which is basically the same size as any of the Txi series (T1i, T2i, T3i, T4i...).
I needed to move the lens further from the camera, so ended up making a box about three inches long and first velcroing, then taping it to the lcd screen. Having done this, the view finder works to steady the camera for handheld and i find it works for both still and video work on the t4i (650d), especially in conjunction with the focus assist (5x, 10x) button.
This product is a must buy, I bought this product for the Canon t4i, my interest is the video, this accessory should be a must buy if you want to record video
With some minor modification, I mounted this between a battery pack and camera body on a t4i. Works very well, and it improves the ability to &#34;pull focus&#34; on your own using the LCD screen as a true magnified viewfinder. The magnifying &#34;glass&#34; is pretty cheap on this one. I think it's actually plastic.
Disadvantage three: you cannot rotate the eye cup, so to work in a vertical mode you have to mash in the rubber cup -- which works pretty well since it is so flexible.
i use it with my nikon 5200 to shoot video, without a viewfinder you dont get the focus on the lcd very well, especially in bright light. the tripod attachment doesnt work for a nikon 5200, thatswhy i glued it on the EzFoto LCD Cover Screen Protector for Nikon D5100 after cutting off the tripod attachment on the frame.now i can shoot video with having good focus control!
Tried everything to get this to work with my battery grip... I even flatted the metal base to try and get it to fit in between as I had seen on youtube, no luck though. I ended up buying a cowboy studio 7 inch magic arm, but it's not a very firm/stable connection. If not using this with a battery grip and a flip out LCD screen would highly recommend.
I did a search on Amazon and found this product along with several others. Because I did not want to attach something via an adhesive to my LCD I opted for this item. At the price point I figured there was nothing to lose if it did not work out how I wanted.I got the product today and just after a short time with it I can say already that I love it. The view through the eyepiece is sharp and clear.
Luckily I was able to work out a storage method that should keep everything together and prevent any loss. Even more luckily, I'll primarily be using the eyepiece with theCarry Speed Swiview Swi-View for LCD View Finder fits any 3" Swivel LCD Screen, since the t3i has a flip-out LCD. If I had a D5 or D7, I would be pretty much SOL. The construction of the mount is extremely cheap and matches the price of the product.
I'm getting older and eyes weaker with glasses fine but without I prefer without I can see far away good.I did a mod I cut the eyepiece off added 1.50"L 1.25" Diameter pvc pipe epoxy glued and painted black now works great without glasses. It will work also with my battery grip now when cut .50" off of the bottom plate leaving enough metal to screw the grip and viewer plate and camera together.
Answer: yes, if it works, it works very well with t4i