george_kuldhardhis Posted April 20, 2004 Share Posted April 20, 2004 I was looking at Sigma 50-500 lens (for Canon EOS). It has 86mm filter size with <b>coarse pitch</b>. What exactly do they mean by "coarse pitch" I do not know where to post this.. There is no category for Sigma!!!, and general archived is closed ! - Thanks Link to comment Share on other sites More sharing options...
scott_ferris Posted April 20, 2004 Share Posted April 20, 2004 Hi George, I think you'll find it refers to the size (threads per inch) of the thread, obviously it's 86mm diameter. I haven't come across pitch differances in filter threads before so it might be a Sigma ploy to get you to buy "special" 50-500 type filters, however if you order filters it would be worth checking with the supplier or better the manufacturer. Take care, Scott. Link to comment Share on other sites More sharing options...
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