Quote:
Originally Posted by brian nordstrom
 Thanks Tony , do you think an Ha filter would clean up the blue for imaging ?
Brian. |
I have very little experience with imaging Brian, but isolating any color will obviously get rid of other colors. The 127ed performs best in red so sharpest images should come from using a good quality red filter, theoretically.
Your Istar will have been supplied with a test certificate performed at it's best corrected wavelength; if that's around the 650nm of Ha then that filter should give the sharpest image through your scope.
I'm not sure why many of the Chinese scopes are tuned to red rather than the middle of the visual spectrum (ie. green).