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    Quote Originally Posted by WalterK View Post
    One of the barlows I was looking st said it was good for f6 and larger. I was basically wanting to know if f9 was larger or smaller then f6. I in photography f9 would be considered smaller.
    l
    It's a bit odd for them to use the word "larger" in an astronomical context.

    EDIT: On second thought, I think Ken is right. They mean the number is larger, not the aperture. So f/9 would be larger then f/6 in this case.
    Last edited by KathyNS; 12-07-2011 at 01:30 AM.

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    DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier);
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