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The Canon 300mm F2.8L I have is not the IS version. The IS version takes 52mm filters. Mine takes 48mm or 2" filters.
Astronomik filters are FAT that is the metal holder thickness. I simply took a very expensive filter and rubbed it vigorously (OK carefully) on 180 grit wet and dry Carborundum paper to thin the metal holder. Then washed in ethanol and acetone and dried with compressed gas. It now fits beautifully into the slot in the lens and the optical surface of the filter is still pristine.
It shows very nice circular concentric Fabry Perot fringes when held up to a bright light source. This shows the quality of the filter.
Bert
Last edited by avandonk; 25-01-2007 at 09:04 PM.
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