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Old 20-09-2018, 05:03 PM
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pluto (Hugh)
Astro Noob

pluto is offline
Join Date: Dec 2011
Location: Sydney
Posts: 1,982
I found them completely necessary when I was doing NB imaging from inner Sydney. Here are a couple of threads comparing them from when I first got them:

The price is now much higher though due to the dollar (almost double) so I'd have to think harder about buying them now days.
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