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RE: Re: Photography And Aperture

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Posted by Astrophotography on March 10, 2000 21:02:59 UTC

Hi Kip.
Prime forcus is ideal for deep-sky. Prime is for light gathering, and guiding. Projection accesories are used exclusively for planetary and lunar shots.
Film speeds for prime focus and deep space are 100-200 ISO long exposure. THe reason being that 100 ISO film can be enlarged considerably while showing no film graniness or wash out of the object. ISO 100-200 is good for the moon and planets, but I would go with 25 ISO or black/white tech pan film for a realistic effect of a silvery moon.
All shutter speeds for prime focus long exposure are not used. The shutter is controlled manually and opened for at least 10 -30 minutes for a good shot. Bear in mind that you must guide the scope during this process. Shutter speeds for the moon can be made as along as the aperture and moon are bright enough. They should be. I would barlow up the camera to 3X without using any projection eyepieces that is unless you want to take shots of extreme magnifications. Such as up to 33,000 - 50,000 mm focal lenghts. GOod Luck. Ron

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