User Guide

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17.3 More Details: Contax 645
Exposure Modes
The Contax 645 manual (M) and semi-auto exposure modes (Av, Tv) are fully
supported by the IQ1 back. Please note that Bulb is only supported on Contax/
IQ1 back when used in conjunction with the Live View function. Go to Chapter
20 (from page 160) for more information about Live View.
Please check the relevant Contax 645 manual for more information on
exposure modes.
Ensure that exposure times are limited between 1/4000 second and approx.
1 second to obtain the highest possible quality with an IQ1 back and Contax
645. Please note that it is not possible to expose images longer than 60
seconds with an IQ1 back.
ISO Settings
The Contax 645 exposure modes use the ISO value set in the IQ1 back. The ISO
setting can be adjusted from the camera back or in Capture One software
when shooting tethered.
Please consult page 60 of this manual for details on setting the ISO. Go to
page 52 for more information about tethered shooting.
Double Exposure Protection
It is not possible to accidently double expose an image by capturing one
image quickly after another when an IQ1 back is used on a Contax 645 e.g.
when using the continuous drive mode.