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Home > Forums > ASTRONOMY > Beginning Astronomy? > Message #836468

Re: barlow basics

Posted by Ed Blankenship on 11/1/2017 9:31 PM in response to barlow basics   (53 hits)
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Hi again Chris,

It would also help us to help you if we knew either the "f ratio" of your 6 inch Newtonian or the "focal length" of the scope. For example: if your scope is an f5 then the focal length is 6" x 5 = 30" or in mm that becomes 152mm x 5 = 760mm, so a barlow would make that 760mm x 2 = 1520mm and then you could compute the "power" of the combination of the scope and eyepiece combination (and perhaps a barlow too).

Ed

Thread:

Subject Posted By Date/Time Hits 
barlow basics Chris Kelly 10/28/2017 5:52 AM 91
Re: barlow basics Ed Blankenship 11/1/2017 9:04 PM 69
Re: barlow basics Ed Blankenship 11/1/2017 9:31 PM 53
Re: barlow basics Chris Kelly 11/2/2017 9:57 AM 67
Re: barlow basics Ed Blankenship 11/5/2017 3:51 PM 45
Re: barlow basics Ed Blankenship 11/5/2017 3:58 PM 41
Re: barlow basics Ed Blankenship 11/5/2017 4:31 PM 49
Re: barlow basics Chris Kelly 11/11/2017 8:19 AM 44
Re: barlow basics Thomas Dey 11/11/2017 4:45 PM 50
Re: barlow basics Chris Kelly 11/13/2017 6:44 AM 38

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