What exactly are you referring to when you say "shutter release"?
Generally, that means the button you push on the camera.
In another thread you were asking about a long pneumatic release. Is it a remote release that you are seeking?
Some don't go deep enough (haha, dont go there guys).
Air release? None better than a DeGroff. Plenty of grunt. I use 1/4"ID vinyl tubing and a blood pressure bulb so you I can lock the shutter open.
Since the plunger isn't released until the valve is opened, no problem with long exposures with Mr. Hasselblad.
DeGroff hasn't been made for years, so it's off to eb for you.
FWIW, the bulb was $5, tubing ~$1.50 and DeGroff valve about $40.
I use about 4' of tubing but longer should be no problem.
As shown in the picture below, there were apparently three different types - all others, Rollei and Leica (and the Nikon F and F2). The depth of the plunger is adjustable and it appears to work on all my cameras that have the screw-in shutter.
The picture below is on my K1000 which doesn't have a self timer.
I sent you a PM for one that you might be interested in.
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