[davewaldo]

Hi,

The setup I used was a canon 20D @ ISO 800. Canon 50mm 1.8 @ f2.8 for 3 mins. In camera NR, no darks, flats or multiple exposures.

I'm not convinced I've got my focus just right yet but that will come....

Here are some shots of my barndoor. To motorize it I found an old car CD player which had 12V motors and gear as well as the roller you can see which actually drives the CD which is glued to the nut on the rod. I then have a control box which controls the speed of the motor. It works quite well (in theory).

Cheers

Dave.