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Old 04-05-2007, 08:31 PM
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ballaratdragons (Ken)
The 'DRAGON MAN'

ballaratdragons is offline
 
Join Date: Jan 2005
Location: In the Dark at Snake Valley, Victoria
Posts: 14,412
Quote:
Originally Posted by UniPol View Post
Ken is right that the focusers are interchangeable however the ED100's focusing tube is 220mm long whilst the ED80's are 160mm long. The longer focusing tube is great if you need a longer back focus.
Thats why it's fitted. For more back focus. No need for an extension tube when doing Astrophotograhy
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