Thanks Andy.  I know my early

Forums Spectroscopy Finding/Guiding with a Lodestar Thanks Andy.  I know my early

Tony Rodda

Thanks Andy.  I know my early attempts suffer from CA.

At 235mm aperture at f6.3 I’ve never had the target star ‘disappear’ in the slit.  I suspect it’s a function of image scale, focusing (psf) and threshold for the displayed image (?).  Once I get these maximized I’ll concentrate on guiding to the point where I can hold that target where I want it.

It seems to be perverse that the smaller/fainter the target the less CA I’ll suffer – given accurate guiding.