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Home > Forums > ASTRONOMY > Beginning Astronomy? > Message #836490

Re: barlow basics

Posted by Ed Blankenship on 11/5/2017 4:31 PM in response to Re: barlow basics   (90 hits)
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Chris Kelly said:

Its a 6" Newtonian : 100 cm from primary to secondary and 152 cm from secondary to eyepiece... I have a good 25 mm eyepiece and an OK 23 mm that I use primarily. I also have a 4 mm & 10 mm that aren't very functional in my area ( 1 hour west of Philly).
I foresee a trip into lesser radiant areas for better viewing. .............. Thanks for the input. I think it is f5.

Additionally, the observation you make about your 10mm and 4mm "... aren't very functional ..." is a very good one. They would be even less functional with a barlow. The reality is that they give "too much power" for your seeing conditions and scope.

As far as barlows go, getting a Celestron branded Barlow increases the chances that you might not have to change the focus much between using the Barlow and not using it (what is called parfocal). I have had good success with the Older Celestron Ultima 2x Barlow in this regard. If you can locate one used, give it a try.

Best Regards,


This post was modified on 11/5/2017 4:33 PM


Subject Posted By Date/Time Hits 
barlow basics Chris Kelly 10/28/2017 5:52 AM 139
Re: barlow basics Ed Blankenship 11/1/2017 9:04 PM 113
Re: barlow basics Ed Blankenship 11/1/2017 9:31 PM 83
Re: barlow basics Chris Kelly 11/2/2017 9:57 AM 100
Re: barlow basics Ed Blankenship 11/5/2017 3:51 PM 88
Re: barlow basics Ed Blankenship 11/5/2017 3:58 PM 100
Re: barlow basics Ed Blankenship 11/5/2017 4:31 PM 90
Re: barlow basics Chris Kelly 11/11/2017 8:19 AM 93
Re: barlow basics Thomas Dey 11/11/2017 4:45 PM 99
Re: barlow basics Chris Kelly 11/13/2017 6:44 AM 75

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