Quote:
Originally Posted by deanm
I read somewhere, somewhen, on IIS of a trick to reveal star colours in long-exposure star-trail photography.
Defocussing the image increases the apparent (but now unfocussed) star diameter - this reveals otherwise non-obvious colour.
It also preserves your field of view, which you otherwise lose by increasing ep magnification.
Try it & let us know how you go!
Dean
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thanks for the tip Dean! the week doesn't look good with rain and clouds predicted
but will let you know.
I think I read the same tip while reading Comets and how to observe them. But never thought to apply to on observing the outer planets. (mainly because it was referring to magnitude estimates and defocusing to make a comparable star the same size as the coma etc)
thanks
matt