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Old 20-04-2012, 12:15 PM
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Moon (James)
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Barlow for imaging with STL?

I'm thinking of getting a Barlow corrector for my 300 f4 newt so I can have a range of focal lengths & fields of view. Right now my FOV is too small to handle smaller deep sky objects such as galaxies.
Normally barlows are used for planetary imaging where smaller CCD chips are used and the correction is only important in the center of the field.

I can't find much info for larger chips, like the STL.

The best option seems to be the ASA 2 " Barlow Corrector 1.8x
http://www.astrosysteme.at/eng/correctors.html

Off axis correction, vignetting, CFZ and arc/sec per pixel all look really good.

Some examples from Gerald Rhemann (the ones at f6.8)
http://www.astrostudio.at/all.php

Are there any other options that I should consider that will give as good results on a large chip?

Baader/Televue?

James
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  #2  
Old 24-04-2012, 11:10 PM
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Moon (James)
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No advice??

btw I have to correct my post above. It was pointed out to me that if the barlow is attached to the camera, the CFZ as measured at the end of the camera+barlow unit is the same.

James
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Old 25-04-2012, 07:44 AM
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bert (Brett)
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Not Cheap, but have you considered the baader ffc?

http://www.astro-physics.com/index.h...ies/baader/ffc
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Old 25-04-2012, 10:16 AM
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I saw that one Brett, but I can't find any deep sky images taken with it.

Last edited by Moon; 25-04-2012 at 10:16 AM. Reason: Doh!
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Old 25-04-2012, 10:40 AM
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http://www.iceinspace.com.au/forum/s...ght=Ffc&page=2

One of Mr Wards, taken with a rc.
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