I just installed a Maxwell screen to replace the Linhof ground glass in my Master Technika (which in turn replaced the Beattie screen that was on the camera when I bought it). Since this is the third screen that's been on the camera I'd like to to make sure the position of the screen is correct. I remember an article in View Camera magazine some time ago that described a testing methodology using playing cards and I vaguely recall another method mentioned here of focusing on a point on a ruler. However, I don't remember the details of either method. Would someone please describe a method they've used to test the correct positioning of the ground glass or cite me to a place where a detailed description can be found? I searched the archives but unfortunately the word "test" or "focus" appears in hundreds of messages. and there doesn't seem to be an "exact phrase" method of searching the archives. Thanks.
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