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I cant find any settings on the web for the lens I have using google(Sigma 12-24mm EX DG).I assume the lower arm is 50.5mm as it stays the same for my 30D.What about the upper arm for my Sigma 12-24mm with this camera?
http://www.nodalninja.com/nodal_ninja_3 … tings.htmlWill give you a starting point.
That was the first place I checked...I found this online"An example if the position of the entrance pupil is known: Distance film/sensor plane to dome glass, Sigma 12-24mm @12mm, Canon mount: required min. focusing distance = L(inf) + 4,4cm (flange focal length) + 7,43cm (bayonet to entrance pupil) + r (dome radius)"http://wetpixel.com/i.php/full/dome-theory/
Okay I rang CR Kennedy (Sigma service point here in Australia)They gave me the following data (film plane to points, for canon mount)12mm focal:First point 104.5mmRear point 12.4mm24mm focal:First point 94.2mmRear point 23.1mm
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