Posted 06 March 2009 - 05:37 PM
I was looking at that same Intervalometer a few months ago for my Arriflex IIC with Cinematography Electronics crystal motor base.
Send them an email and they will send you a PDF of the instructions for the Intervolometer. The question about shutter speed you are looking for is covered in the instructions.
It's been a few months since I looked at it, but IIRC the shutter speed was somewhere around 1/3 of a second, but I can't remember for sure.
Also IIRC there was some issue with using that intervalometer with certain cameras. You have to buy some other part (a Single Frame Kit) to use the intervalometer with certain cameras, check the web site for details, but I think the two cameras you mentioned, the Arriflex 16SRII and the Arriflex 35-3 both need that extra part.