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M45 11/12/07 Amersham. WO 80mm,refr.with 0.8 focal reducer and ALP filter. Canon EOS 400. 20x2 min exps. DSStacker and PShop6. David Godwin

M45 11/12/07 Amersham. WO 80mm,refr.with 0.8 focal reducer and ALP filter. Canon EOS 400. 20x2 min exps. DSStacker and PShop6. David Godwin

From: Wycombe Astronomical Society Members (Mon 17 Dec 2007 04:10:35 AM CST)
Super! Lots of nebulosity. It seems a little green rather than the traditional blue, is this the effect of the filter?
Also is this guided?
Chris
From: Wycombe Astronomical Society Members (Mon 17 Dec 2007 01:39:27 PM CST)
Hi Chris. I guess you are right and the light pollution filter is producing a colour cast. Haven’t got round to guiding yet but HPQ-5 mount seems ok for 2min exs. Also used Gradient Terminator trial from S at N CD-ROM. David

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