Daniel, I read your note just after I got through playing with my Access calculator for exposure time. I did it both Berry’s way and Covington’s way and you are so right, “The learning experience is always worth the journey.” I re-learned how to mess around in Access and VBA. Both were satisfying experiences. One of the ruling factors for me is how long can I expose for while tracking and/or guiding. Shorter is safer. As in several 180 or 300 second exposures with maybe 10% throw aways as apposed to 1 ten minute exposure with 100% throw aways…lol I am still learning my equipments abilities and the weather isn’t helping a lot. I am enjoying the journey with some frustrations, but as time goes on most frustrations are concurred. Jim