WO 72/432, ZWO ASI183MM Pro
fog

Planewave CDK 17" & SBIG STXL 11002
120 sec pics on IR-UV filter.

Celestron SCT 280/2800 Atik 314L+ red. 0,63x
Adopted limb darkening: 0.5 | EXP. 90s | binning 1+1 | defocus | FWHM 15.2 px (11.5 arc-sec/pixel) | weather: clear, dry air | bortle 5, encircling light pollution | Photometric aperture radii: 16-36-46| Baader IR pass 685 nm filter

Newton Truss 254mm F/3.8 - Atik 414 Ex Mono
Filter-Baader SLOAN-r

RCT 406/3248 + CMOS Moravian C3-61000 Pro m + FR 0.6
Red photografic filter. Exposure 300s

406 mm LX200 SCT/SBIG STL11k CCD
60 sec, XOP-CBB filter.

C-14, Paramount MEII, SBIG ST-8XME
Eight comparison stars, thin clouds, temperature -20 C