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| Focal Length
Forum List | Follow Ups | Post Message | Back to Thread Topics Posted by Scott on November 21, 2001 05:17:39 UTC |
I am building a 10" reflector telescope. Please explain the difference between a 10" f7 and say a 10"f4.5. I understand the tube length is determined by the mirror diameter/f number. What would be the benefits of a higher f number and longer tube versus a smaller f number and shorter tube? Thanks, Scott |
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