--- Tyler Allred <tylerallred@earthlink.net> wrote:
My response to these questions: - Exposure duration..... This object (Vdb142) is quite dim and doesn't have any really bright stars in the field.
In searching some catalogues and other net pictures, I don't see a reported surface brightness for this nebulae in integrated mag or surface brightness. Care to give an estimate?
Also, remember that I was shooting with a narrow band filter that only allows a narrow range of light to pass. The Ha filter greatly reduces the total light reaching the chip.
What's the filter factor on the Ha? - Canopus56 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com