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The Bahtinov masks are best for focusing. Search the net and find some templates. I did this (still have the templates in PDF form) and simply drew the pattern on A4 printer paper, painted it black and laminated it. I made three (66mm, 80mm and 125mm) and they work great. Costs about 30 cents, bit silly of me as I initially bought a 10" kedrick version for about $50.00 to suit my LX200.
Mark
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