Quote:
Originally Posted by gregbradley
CCDinspector is a handy program. I'll have to get that.
In CCDstack if you click on several different stars you'll get several wildly different FWHMs. Hence my scepticism. Larger stars inevitably give a large FWHM and the lowest FWHM will be a small tight star near the centre of the image.
Greg.
|
The thing here is FWHM is supposed to be for you to measure the relative quality of each frame. The result it gives you is an average of the particular images FWHM. This means that you can compare each images focus and guiding against another image. This is how I use FWHM, because you are right different software will report different absolute numbers, but as long as you are using one piece of software you can gauge relative quality.