Why doesn't Canon Make one of these?

http://www.adorama.com​/INKDK17M.html

I am looking at improving my manual focus on tele and macro shots. I have the T4i (650d) and have seen mixed reviews on third party focusing screens. Has anyone seen or tried a 3rd party version of the viewfinder magnifier or focusing screen that they could provide their feedback on? I know I can use live view to improve for tripod shots, looking for something to improve handheld. Thanks!

If you search far enough back you will find Canon users adopting Nikon 1.25X eyepieces to canon bodies. The downside is that that is not enough magnification to really make a significant difference in accuracy adjustment.
If you have ever tried a Canon angle finder C, it has both 1.25 and 2.5X magnification positions. of course 2.5X is better for details, but you loose all the exposure information at the bottom of the screen as well as ~1/4 of the image on both the far left and the far right. Thus you constantly need to flip between 1.25X to see the entire composition and 2.5X to see a bit bigger image in the center of the frame.

The introduction of Live View has built in that image preview magnification capability into your camera body. You get 1X, 5X, and 10X with the ability to scroll about the entire range of image corners while in magnified mode. Of course 10X is way better than 2.5X for details.
I use Live View manual focusing most of the time, as I own 5 manual focus only lenses. I found accurate adjustment of lens tilt to be near impossible with a viewfinder, even with a 1D series viewfinder. LV was a godsend.

Canon doesn't make removable focusing screens for the Rebel series
http://www.learn.usa.c​anon.com …ingScreens_Quic​kGuide.pdf

But after market versions of focusing screens that will fit are available. I am not knowledgeable about their installation issues on the 650D. Changing the focusing screen will change your exposure, with the degree of impact depending upon the screen type and lens choice.
http://www.focusingscr​een.com/index.php?cPat​h=21_133
Mike K

canon doesn't make them but there are 3rd party ones, I have one for my 1dmk III

I haven't tried the angle finder, I'm really used to the traditional viewfinder. I think I'll try adapting the Nikon magnifier and see it works before trying to replace the focus screen.

Qlayer2 wrote in post #16587185
I haven't tried the angle finder, I'm really used to the traditional viewfinder. I think I'll try adapting the Nikon magnifier and see it works before trying to replace the focus screen.

I modified the DK-17M for the D7000 when I had my Nikon. I kept my modification when I sold the camera and wanted to use the DK-17M on my 5D3. But the part that slides over the viewfinder was too small on my mod. I think only way is to take the Canon eyepiece and modify it so that it can fit the magnifier

Here is my tutorial for the mod on a Nikon - http://www.1kindphotog​raphy.com …n-dslr-camera-dk-17m.html. I also listed some eyepieces for Canon for those who want eyecups or extensions so that your face isn't so close to the LCD screen.

I would buy an aftermarket eyepiece and modify it for the Canon if I can find a DK-17M for dirt cheap.

I ordered the DK-17M, and am thinking of getting one of these to mate to it, along with one of these. I'm guessing the glass will have to come out of the canon eyepiece and then I'll try and find a way to mate it and the nikon magnifier.

Qlayer2 wrote in post #16593800
I ordered the DK-17M, and am thinking of getting one of these to mate to it, along with one of these. I'm guessing the glass will have to come out of the canon eyepiece and then I'll try and find a way to mate it and the nikon magnifier.

I would avoid getting the rubber eyecup that you linked to. It may not fit the DK-17M. If you want rubber eyecup for the DK-17M, you're better off getting the one that fits the magnifier. As for the eyecup eyepiece, you'll have to remove the rubber that is around it and take a filer and make a circle. Since the opening is rectangular, its going to take a while to make it round. It has to be big enough to hold the magnifier but not too big where it can fall out easily.