Adding frames to a viewfinder
Suppose you are using a viewfinder for a 28mm lens and one for a 50mm lens but you want to bring with you only the 28mm one and you want to add the lines corresponding to the 50mm lens. Suppose also that you have no problems disassembling and reassembling the thing and have a way to know where to draw the lines (also suppose you don't really care if the thing is 100% precise, just you need something for your mirrorless camera which has no viewfinder at all for when the sun is bright). What is a good way to draw lines to the little glass in a way which looks professional and don't break everything?
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