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Old 18-08-2015, 10:59 AM
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PRejto (Peter)
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PRejto is offline
Join Date: Jan 2011
Location: Sydney, Australia
Posts: 1,318
Here are 2 solutions. One is very expensive ($793!)but looks very interesting:

Follow links from here:

Baader Fluorite Flatfield Converter Barlow (BPFFC)


2" Advanced Convertible Barlow (BARADV) ($250)

I've used the 2" AP barlow with my KAF8300 CCD and it works very well. You can adjust the power somewhat by moving in/out. I took this photo of M83 using it with my TEC140:
and M16

TAK also has a good photographic barlow at 1.6X.

I would think you need 2" to avoid vignetting. Personally I'd go with one of these over your standard barlows.

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