
Welcome to my astronomy blog, I dedicate myself to the simplest form of amateur astronomy which requires only portable equipment. I have two small refractors, two small binoculars, one small GOTO mount and another small equatorial mount, and a small H-alpha solar filter. Originally from a city where the people were proud of their light pollution, that is Hong Kong where I loved. Relocated to the UK since 2021.
Sunday, July 22, 2007
Casio UV/IR blocker testing: M7
Fujinon 75mm f/1.8 wide open, 13.75s at 520 gain, 28 frames stacked, DBK 21AF04. This time with UV/IR cut which is removed from my Casio QV2800, the image looked sharper and free of those large blue/red halo, I shall try to stop down the aperture next time to see if it helps or not:

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