Astrophotography Gallery See some astrophotography taken by HAC below. The Sun through a built-in H alpha filter. 20mm eyepiece on a Coronado PST. The Sun projected onto a Sunspotter. M51 (Whirlpool Galaxy), 60 seconds, no filter. 700mm aperture, f/6.5. M64 (Black Eye Galaxy), 60 seconds, no filter. 700mm aperture, f/6.5. M16 (Eagle Nebula), 5×60 seconds = 300 seconds total exposure, no filter. 700mm aperture, f/6.5.