AstroJohnH:
SPX350-star test
AstroJohnH:
SPX Zygo comparison
AstroJohnH:
AD v AK comparison
AstroJohnH:
Ha-comparison
AstroJohnH:
O3-comparison
AstroJohnH:
rgb-astrodon v astronomik
AstroJohnH:
green comparison
AstroJohnH:
blue comparison
AstroJohnH:
o3-atrodon v astronomik
AstroJohnH:
ha-astrodon5nm v astronomik6nm
AstroJohnH:
measurements for vignetting
AstroJohnH:
Express card
AstroJohnH:
Flea3 compared to DMK