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Not necessarily a truck Rajah. with a 4X powermate even a modest 10" dob's FL becomes 7.2 meters (assuming its normal FL is about 1.8m. EFL (Effective Focal Length) = M (Magnifiying Unit. Not your usual magnification (Tel FL/EPFL) ) X OTA FL.
ie EFL = M X FL (ota)
Last edited by [1ponders]; 20-03-2005 at 04:05 PM.
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