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B.S.Kumar · Dec 12, 2023

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Nicholas Lindan · Dec 12, 2023

What is the difference Copal No. 3 Vs 3s???

I have several Copal No. 3 and one Copal No. 3s on the way. Please, What is the s suffix for? I tried the search but it is useless, I get no hits or thousands with no in-between. Is there any way to use logical expressions in a LF forum search?

www.largeformatphotography.info

Ian C · Dec 13, 2023

From S.K.Grimes site:

Copal Dimensions and Specs

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 shutter	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
price*	$426.00	$585.00	$1190.00	$1190.00

Ian C · Dec 13, 2023

In addition to different threading and mounting hole diameter, the 3S is set up for a different cell spacing, 32 mm on the Copal 3, and 28.6 mm on the 3S.

B.S.Kumar · Dec 13, 2023

Thank you, Nicholas & Ian.

Kumar

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What is the difference Copal No. 3 Vs 3s???

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