Focus screen question

I'm considering buying a different focus screen from the stock focus screen inside both bodies of my camera, just a silly question, do the focal points i.e the red focusing lock indicator change to compliment the screen or just stay the same?

They stay the same. The AF sensor is actually on the bottom of the camera's mirror box and so the AF pattern's locked in.

OK, thanks

Are you considering Canon screens, or ones on the aftermarket?

Canon provides CFn settings to restore metering accuracy for their screens. There are no CFn settings for any aftermarket screens. Those that have a center focus aid can significantly affect metering accuracy, particularly in Spot mode, by reportedly as much as 2EV error.

I'm going for a Canon if I get one, because I didn't know of any aftermarket ones whatever that means, unless you mean generic types

The term aftermarket generally refers to any product that is not made by the original equipment manufacturer (OEM). In this case, Canon is the OEM; aftermarket products would be made by any other company (aka 3rd party).

your 50D has user-swappable focusing screens from Canon, but a number of the newer camera models use what is called a 'transmissive display' which do not permit one to swap out a focusing screen.

drvnbysound wrote in post #16459351
The term aftermarket generally refers to any product that is not made by the original equipment manufacturer (OEM). In this case, Canon is the OEM; aftermarket products would be made by any other company (aka 3rd party).

i.e generic lol