Focusing screen not square (450d/XSi)

Started May 21, 2013 | Discussions thread
photonius Veteran Member • Posts: 6,816
Re: Focusing screen not square (450d/XSi)

AnthonyL wrote:

WilbaW wrote:

I'd try it on a tripod so that you can be sure it's not you tilting the camera when you press the shutter button.

Tripod makes no difference.  The dots don't align exactly with the squares.

It's easy to remove and replace the focus screen in a 450D if you know what you're doing, but yeah, daunting the first time and easy to mess up. 

I don't know if replacing would make a difference, I was hoping to rotate.

I have the same feeling with my 550D, I tried  using the dots for alignment, and then it's not straight in the final picture. I have not done a rigorous test, but when I tilt the camera a bit so the dots don't quite line up (in opposite direction of the tilt), then it looks more straight afterwards. As suggested, in live view that problem shouldn't exist.

I suspect it may not be unusually for the viewfinder to be off by 1 or 2 degrees - which is of course not desired. I will have to test it seriously with the camera on a tripod and a level to make sure all is perfectly aligned (a horizon may not always be horizontal either).

The reason I am not surprised about variation is that in my 550D, the central spot exposure metering point was actually not in the center at all, but substantially off to the right. Took Canon several attempts to fix it, because initially they didn't figure out what was wrong, I had to pinpoint the exposure problem for them.

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