|
How good were sky conditions tonight?
I was doing some test imaging with my new Asker ED lens on my Nikon this evening and was amazed by just how calm the sky was. Looking through Backyard Nikon's frame and focusing tool the stars I chose were absolutely rock solid, no wobbling around. The FWHM number was incredibly low with no oscillation. I was seeing FWHM numbers of 2.5.
I hope everyone else on the NSW coast enjoyed the same conditions. No wind, humidity was high here by the water but no dew on the camera or lens in the observatory.
For those that may not understand FWHM here is a brief definition:
A stars 3D profile somewhat looks like a bell. FWHM is the width of the bell at its midway point hence "half". For all practical purposes you want this number as small as possible.*As the star goes out of focus, the shape of the bell gets fatter and the mid point gets larger in diameter.
Last edited by glend; 07-05-2022 at 01:36 AM.
|