COPAL spec.	#0	#1	#3	#3s
front thread	M29.5-0.5	M40-0.75	M58-0.75	M56-0.75
back thread	M29.5-0.5	M36-0.75	M58-0.75	M56-0.75
overall thickness	20 mm	20 mm	32 mm	28.6 mm
front to iris	10.2 mm	10.75 mm	17.7 mm	16.25 mm
mount thread	M32.5-0.5	M39-0.75	M62-0.75	M61-0.75
lensboard hole	34.6 mm	41.6 mm	65 mm	64.1 mm
iris dia	24 mm	30 mm	45 mm	45 mm

http://www.skgrimes.com/lensmount/24art/index.htm

 

http://www.skgrimes.com/fits/index.htm

 

http://www.skgrimes.com/products/