Having used some heavy lenses on long extensions, I have just merely tested the benefits of the "Cap-Shutter" in low light conditions. This is: masking the lens with a dark non reflective object (lens cap or else), firing on pause B, waiting a few seconds for all vibrations to stop and moving the object away and back for the duration of the exposure. I'm wondering how precise we can get with that technique. Some say 1/4 of a second can be managed. Also, what masking item and what mouvement do you have come to use. Normally the mask should return from the opposite side it moved to for a consistent exposure. It is probably possible to adjust the exposure time of for instance the sky if it stands in the picture, and imitate a neutral grad filter. What would experienced "Cap-Shutter" shooters have to say? Also what speeds are safe? I would think that anything faster than 1/15 and slower than 1 sec is shutter safe, that is with flimsy camera set up when the lens is balancing and prone to move, would you agree?
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