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Howdy!
From what very little knowledge I have on astrophotography, an ir filter is almost essential when imaging through a refractor although they see more blue than anything else and you need to process this away. Is there a difference when using a refractor to a reflector?? I have just bought a Canon 40D and a couple of ED refractors to start imaging through, but please don't anyone hold their breath for my first pic!
Cheers
Al
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