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Maximum useful barlow magnification

Started by ddoctor, 08/30/2005 03:29PM
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Posted 08/30/2005 03:29PM Opening Post
David Doctor
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Join Date: May 2003

Location: Las Cruces NM, US

Posts: 21

Hi group,

I'm using a 10" f/7 newtonian. No problem with a 3x barlow, but what about a 5x powermate? Let's assume superb seeing and everything else. I can't remember the calculation for the maximum useful increase. I don't use eyepiece projection. I know a lot of folks routinely image in the f/35 range. Is it too much for this set-up?
Thanks.
Dave
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Posted 08/30/2005 04:30PM #1
Alan Friedman
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Location: Buffalo NY, US

Posts: 1170

David -

It should be just fine - especially so for the planets in good seeing.

Alan
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Alan Friedman

http://www.avertedimagination.com
Posted 08/30/2005 05:51PM | Edited 08/30/2005 05:51PM #2
Paul Maxson
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Location: Surprise AZ, US

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David,

I have used a 5x powermate with my 10" F/12 Mewlon and it has worked quite nicely. Even with projection tubes behind my 3x barlow producing F/40 I get nice images. But mostly it depends on seeing.

Paul
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Paul Maxson
Moderator - CCD Imaging and Processing/Solar System
Celestron C14, Mewlon 250, Orion EON120, ASI120MM, Flea3.
http://www.sunspot51.com
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