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Andrew wrote: but I've never managed to get a red tarantula without using a mono CCD and lrgb filters.
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Undoubtly with filters LRGB and H alpha we get more real image of DSOs. No discussion about it. But some color information can be captured with DSLR. The seeing, black sky, and graphic procedures are factors with more influence in the result.
ISO 400 - canon 350d - 18 x 120 sec -
http://astronomia-e-astrofotos.10697...-131210-1k.jpg
ISO 800 - canon 350d - 20 x 120 sec - Skyglow filter -
http://astronomia-e-astrofotos.10697...-140130-k7.jpg