Thanks for solving that mystery for me Marty.
After reading your post I checked the manual again and found the section that mentions the green filter, but your explanation gave a better idea what it's used for.
I've emailed Northern Photo in Leeds to see if they have a spare part.
The M800 was kept in an unheated garage and has small rust spots everywhere on the metalwork but otherwise seems okay; I'm trying to decide if I should remove the spots or just live with them.
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