Ok, first my excuses: 1. trying out new Polar Alignment scope, forgot to check alignment with mount on install. Alignment was way off - 132" - so knew tracking would be not so good even at 30 Seconds. 2. Just used 3x enlargement on Denb to focus lens. Overall I think this lens has some potential. This image is about a 20% crop -perhaps more. 40 30 second subs, no darks or no other subs. With a good polar alignment, darks, lights and no moon it should produce some good stacked images. Shot @ 400 mm @ 30 Seconds .