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If your DSLR doesn’t have mirror lock up, you can use the “top hat” method for “Bulb” or long exposures.
Basically, you place a loose fitting cover (like a top hat) over the end of the ‘scope to completely block the light, and then open the shutter of the DSLR using e.g. a cable release. Wait for say, 10 seconds for the vibrations to die down, then very carefully remove the loose fitting cover and your exposure then begins.
To close the shutter, re-fit the cover (carefully) and then close the shutter using the cable release.
This is how I used to do it in the days of SLR’s using 35mm film. The cable releases had a locking grub screw to hold the shutter open.
The down side is that you have to do this for every sub frame if you are going to combine say, 10 x 3 min exposures.
Cheers
Dennis
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