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CMS-XML EF15mm f/2.8L USM: How to use filters with this lens.
The EF 15mm lens does not use standard front mounted filters due to its wide field of view. Instead is has a pocket at the rear of the lens into which 31 mm square acetate filters can be placed
CMS-XML EF15mm f/2.8 Fisheye Specifications
Specifications for the EF 15mm f/2.8 Fisheye Marketed April 1987 Lens Construction (group) 7 Lens Construction (element) 8 No. of Diaphragm Blades 5 Minimum Aperture 22 Closest Focusing Distance (m) 0.2 Maximum Magnification (x) 0.14 Filter Diameter ( mm ) -- Maximum Diameter x Length ( mm ) 73 x 62.2 Weight (g) 330
CMS-XML EF20mm f/2.8 USM Specifications
Specifications for the EF 20mm f/2.8 USM Marketed June 1992 Lens Construction (group) 9 Lens Construction (element) 11 No. of Diaphragm Blades 5 Minimum Aperture 22 Closest Focusing Distance (m) 0.25 Maximum Magnification (x) 0.14 Filter Diameter ( mm ) 72 Maximum Diameter x Length ( mm ) 77.5 x 70.6 Weight (g) 405