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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?
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http://www.nodalninja.com/nodal_ninja_3 … tings.html
Will give you a starting point.
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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/
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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 104.5mm
Rear point 12.4mm
24mm focal:
First point 94.2mm
Rear point 23.1mm
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