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stets
Carpal Tunnel
Reged: 04/13/06
Posts: 2262
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What are the advantages/disadvantages of using the 2" BF 30
on a Coronado 90mm scope (as opposed to BF 15)?
Does the 2" BF 30 make it easier (more stable) to mount a camera?
Are there advantages to imaging with the 2" BF?
Edited by stets (11/08/09 09:37 AM)
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Oldfield
Postmaster
Reged: 03/20/02
Posts: 5816
Loc: Hong Kong
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it's blocking filter, not backfocus :-)
the number gives the focal length in which you can still see a full disc, i.e. a BF15 will allow you to see full solar disc at 1500mm focal length.
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The Home Astronomer from a city where most people are proud of the light pollution
Toys: Orion 100ED, Ranger with NGF-CM, SM40/BF10, TG-SP II, LXD55, DMK 31AF03, Canon 10x30 IS...
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stets
Carpal Tunnel
Reged: 04/13/06
Posts: 2262
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thank you, Oldfield
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