Thanks guys,
I must admit I have dropped back to 800 ISO for most of the shots i'm taking now. (since I took that image anyway).
As for the star trailing anything longer than say 10-15 secs I start to get some. I was using the "500" Rule but I was also accounting for the crop sensor. 500 divided by the (18mm X 1.6 crop factor) which gave me a limit of 17 secs.
What would be a good zoom lens to capture nebulosity in the pleiades or Orion, or at least make some clusters fill a decent portion of the FOV. Thinking you need something 300mm or longer for this right?
And is trying to make a barn door tracker worthwhile? I've got some stepper motors and know how to make this work i think
