Thanks for the feedback folks. Robby, yours shows nice accurate guiding there. I didnt do dark subtraction, as when I stack the images with Photoshop , noisy pixels (except the amp glow on extreme right side of images, dissapear) What I do is offset the 2nd image slightly (by moving the guide star slightly between the 1st and 2nd shot by, say a dozen or so pixels). This ensures that any hot pixels dont appear at the same place when the 2 images are aligned and stacked, they then get averaged out. In future I might even go as far as 1/2 hour shots and see what happens
Scott