topic Re: Rebel T7 focus screen replacement in EOS DSLR & Mirrorless Cameras

EOS Rebel T7 How to position focus screen replacement inside camera

Robert1966 — Tue, 11 Mar 2025 12:35:05 GMT

How the focus screen should be positioning inside camera? There is a different side latches - one rectangular on the other side trapezoidal, looking from up side down (left side is "Rebel T7" mark at the body) hot to put focus screen inside?

Re: Rebel T7 focus screen replacement

deebatman316 — Mon, 10 Mar 2025 20:43:52 GMT

The focusing screen on Rebel series cameras IS NOT USER replaceable. It will have to go to Canon if you have an issue with your focusing screen.

Re: Rebel T7 focus screen replacement

Robert1966 — Mon, 10 Mar 2025 20:54:49 GMT

Not sure, first things first - to release the focus screen need to slightly push a top notch on positioning thin steel frame then gently take off frame - focus screen is released. The main issue is to place a new one (simply to buy off in Amazon or others) - without touching screen (covered by special chemical treatment) - my problem is that the screen fall off and I do not take a look in which position should be placed

Re: Rebel T7 focus screen replacement

deebatman316 — Mon, 10 Mar 2025 20:59:38 GMT

Canon USA says that the focusing IS NOT user replaceable. So it must be sent to Canon for replacement. There is no release for it either DO NOT attempt to remove it. It’s not designed to be user replaceable.

Re: Rebel T7 focus screen replacement

Robert1966 — Mon, 10 Mar 2025 21:08:17 GMT

a new focus screen

I understand that the Canon stated to replacement have to be at their service but to be honors - this kind of job do not need MBA in IT degree - at Canon service they make it no other way as it's possible - see attached pictures - the question is - the blue arrow - it should be on right side of camera - looking up front ("Rebel T7" on right side of the body or as it is (red arrow right side)?

Re: Rebel T7 focus screen replacement

Robert1966 — Mon, 10 Mar 2025 21:10:42 GMT

Forgot to mentioned - this camera is 4 years old after warrant period - it make no sense to pay 50$ or more for so simple job

Re: Rebel T7 focus screen replacement

deebatman316 — Mon, 10 Mar 2025 21:19:14 GMT

There’s no release that drops down the focusing screen. Therefore it cannot be changed out by the user. It’s installed in such a way that it cannot be removed like other cameras. Why does your focusing screen to be changed. Those rarely if ever need to be replaced.

Re: Rebel T7 focus screen replacement

Robert1966 — Mon, 10 Mar 2025 21:23:44 GMT

Unfortunately during lens change in windy condition some particles get inside, the sensor was covered by mirror - so was OK, mirror cleaned - OK but some dust cover focus screen and caused scratches (blower do not a job have to use microfiber - very gently but without success

Re: Rebel T7 focus screen replacement

deebatman316 — Mon, 10 Mar 2025 21:30:50 GMT

There’s no way for you to replace it yourself. You could affect the camera’s metering system. Causing over or underexposed pictures. Cameras that have user changeable focusing screens. You have to tell the camera which focusing screen is installed.

Re: Rebel T7 focus screen replacement

Robert1966 — Mon, 10 Mar 2025 21:36:25 GMT

this is a software issue? If the focusing screen is original one should be recognize automaticly I suppouse?

Re: Rebel T7 focus screen replacement

deebatman316 — Mon, 10 Mar 2025 21:43:34 GMT

No it won’t. The camera doesn’t know what focusing screen is in the camera. That’s why cameras with a user replaceable focusing screen. Have a custom function that tells the camera what focusing screen is installed. Canon doesn’t sell an OEM focusing screen for Rebel Series cameras. My old EOS 40D has a custom function that tells the camera which focusing is installed. A lot of newer DSLRs don’t have a focusing screen in them. Instead they use an LCD overlay in the viewfinder. This is NOT user replaceable if it breaks. It must be sent to Canon for repairs.

Re: Rebel T7 focus screen replacement

Robert1966 — Mon, 10 Mar 2025 21:45:07 GMT

ok, will see

Re: Rebel T7 focus screen replacement

deebatman316 — Mon, 10 Mar 2025 21:52:46 GMT

I don’t recommend that you attempt replacing it yourself. It clearly wasn’t designed to be user replaceable. Then you could cause more damage to your camera especially with the reflex mirror.

Re: Rebel T7 focus screen replacement

normadel — Mon, 10 Mar 2025 22:07:24 GMT

You aren't listening. The focusing screen IS NOT USER REPLACEABLE!!! Having gotten yours out, you may well have done some damage. Having an IT degree has nothing to do with it.

Re: Rebel T7 focus screen replacement

Robert1966 — Mon, 10 Mar 2025 22:21:44 GMT

OK, Ok take it easy, just asked a question. As far as I concerned the focusing plate is literally piece of plastic mat one side (in fact with micro cuts) on which focus points detects sharpening. Quite strange that it's affected the camera soft. Anyway, asked the Canon service at Wilmington and the told me that the cost should not exceed 75$ and it takes 10 minutes. Therefore I asked if service grant 10 minutes maybe will be possible to DIY. However thanks for help anyway

Re: Rebel T7 focus screen replacement

deebatman316 — Mon, 10 Mar 2025 22:38:59 GMT

A focusing screen IS NOT made out of plastic. Its made out of glass or Fresnel lens. SO follow my suggestion and my colleague's @normadel you could cause more SERIOUS damage to your camera.

Re: Rebel T7 focus screen replacement

Robert1966 — Mon, 10 Mar 2025 23:12:54 GMT

Ok , will follow, get the service , but one issue - I know " curiosity kill the cat" but it is really any conection between focus screen and AF? Using live view is Ok. o ly eye finder "cosmeticly" looks poor but even by this pictures are sharp.

Thanks in advance

Re: Rebel T7 focus screen replacement

Robert1966 — Mon, 10 Mar 2025 23:17:07 GMT

By the way the Fresnel kens usually made if acrilic or polycarbonate material (not a glass), invent in 1822 (originally glass but now aclic or polycarbonate)

Re: Rebel T7 focus screen replacement

deebatman316 — Mon, 10 Mar 2025 23:18:36 GMT

Viewfinder AF is carried out by sensors on the floor of a DSLR camera and are under the mirror. Live View uses the image sensor itself and IS not susceptible to front or back focusing. The focusing screen doesn't affect view finder AF.

Re: Rebel T7 focus screen replacement

deebatman316 — Mon, 10 Mar 2025 23:20:32 GMT

Canon has lenses with DO (Diffractive Optics) or Fresnel optics and its glass NOT plastic.