Placing your mouse cursor on and off the image above will switch
H-alpha views from a 90mm Etalon to a
92mm aperture spectroheilograph image of the Sun.

A slight rotation of the Sun is apparent due the images being taken about 15 minutes apart.

Astro-Physics AP130GTX + AP BARCON
Coronado 90mm Double-stack etalons + BF30
QHY533M

Astro-Physics 92mm Stowaway plus MLAstro SHG and QHY678

Copyright Peter J Ward 2025