The Sinar shutter cable does stop the aperture down on the way to firing the shutter. The way to avoid the sometimes maligned Sinar Shutter Shake, I have found, thanks to posts on this forum, is to SLOWLY depress the shutter cable. About at the end of the throw you will feel an increased resistance - that is where the shutter is about to fire. Continue to depress slowly and the shutter fires. Using that method I have not experienced camera shake that finds its way to the image.
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