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Is there a way to user a timer for long exposures with the Hasselblad 503cw

I think the only option is to use a locking cable release.

1. Set your lens at B.
2. Press the cable release knob and then turn the screw or the lock collar to keep the cable release down.
3. Use an external timer like your phone or a watch.
4. At 30 min., unscrew the lock collar, and the shutter will close.
 

That is exactly what I would do with my Hasselblad 503 CX.
 

Yes, but the last time I checked the Hasselblad 503 CW is not exactly what one would classify as a pinhole camera.
 
Yes, but the last time I checked the Hasselblad 503 CW is not exactly what one would classify as a pinhole camera.

I have a nice pinhole attachment for my Hasselblad 500cm and Flex, F-stop 250.

No exactly a "cap" and available in other f-stops, with the one I have giving a focal of 75mm.


If your camera accepts "V" Series Hasselblad lenses and extension tubes, it'll take this as well.