Re: [Utah-astronomy] Autoguiders
Thanks Barney. I've heard of Starlight Express and they do have a nifty method of autoguiding. But for me, autoguiders are a bit down the road. My intention of my thread was to try to learn how to do a polar alignment so I can go west of town in May and shoot a picture of the comet NEAT. I thought I would use my OM-2N film camera with a 50mm lens. Debbie
Debbie for small comets (and even largish ones), a 50mm lens is too short. Go with at least a 135mm. Using a 50mm lens, Hale-Bopp was only 1" long on a 3"x5" print. With a 135 it almost filled the frame. --- UTAHDEB@aol.com wrote:
Thanks Barney. I've heard of Starlight Express and they do have a nifty method of autoguiding. But for me, autoguiders are a bit down the road. My intention of my thread was to try to learn how to do a polar alignment so I can go west of town in May and shoot a picture of the comet NEAT. I thought I would use my OM-2N film camera with a 50mm lens.
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Chuck Hards wrote:
Debbie for small comets (and even largish ones), a 50mm lens is too short. Go with at least a 135mm.
Using a 50mm lens, Hale-Bopp was only 1" long on a 3"x5" print. With a 135 it almost filled the frame.
And, better still, with just 135 mm of focal length you can be _much_ less concerned about polar alignment. Patrick
Patrick makes a good point, since you are guiding on the comet and not a star polar alignment isn't as critical. But at least try and get close. --- Patrick Wiggins <paw@trilobyte.net> wrote:
Chuck Hards wrote:
Debbie for small comets (and even largish ones), a 50mm lens is too short. Go with at least a 135mm.
Using a 50mm lens, Hale-Bopp was only 1" long on a 3"x5" print. With a 135 it almost filled the
frame.
And, better still, with just 135 mm of focal length you can be _much_ less concerned about polar alignment.
Patrick
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