Thread: Low Mag / High Mag
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Old 12-09-2017, 01:52 PM
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FlashDrive (Poppy)
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FlashDrive is offline 		 
Join Date: Apr 2008
Location: Bribie Island
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Let's put it another way ....

Let's say I have a F/5 Achro' with a 100mm Lens .... I have an eyepiece giving me say 20x .... what is the ' formula ' for finding the f/l of the eyepiece.

Col.....
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