...
Be sure to set your camera up at 4 feet and test for focus against a negative. You may find as much as a 6 inch error, which points to the pads behind the mirror as having deteriorated. I did not know they were still making the CM in 1990. Perhaps by then they had shifted to a better pad material than the earlier foam, and a focus error might not exist.
You mean the most accurate for focussing? So this is definitely not an Acute Matte screen?That is the center microprism screen. The most accurate of all.
... Although I never did bother to determine the last year of the CM. ...
The 500C/M went from 1970 to 1994.
https://en.wikipedia.org/wiki/File:Hasselblad_timeline_-vectorS.svg
That is the production years, the cameras are still going.
Just for the record (it's been answered over the course of the thread), that screen is a Hasselblad 42250 screen (center micro-prism with grid), pre-acute matte (first acute matte was 1989, they never made a microprism only acute-matte). It is probably my second favourite screen, and one I use regularly. Although the ground glass field is on the dim side (but perfectly fine in bright light), the micro-prism spot is bright and easy to focus as long as your lens is f/4 or faster.
My favourite screen is the microprism/split image acute matte (42215), it's brighter, still has a easy to focus microprism area, but alas, cost way too much.
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