Hoegaarden Astronomy & Photography
This is a very familiar sight and thousands of pictures have been taken of this little “seahorse” or horsehead in the sky. Taken with the Celestron C11 on an EQ8 mount, Starizona LF corrector for Schmidt-Cassegrains, a Nikon D750 DSLR modified for extra H-Alfa sensitivity. 22 frames of 300 seconds each are combined in this image
Further tuning the telescope optics: looking for the right distance corrector-sensor (it’s not the Starizona advertized 134.5mm ) and dealing with OAG focus, field, illumination, shadow and also with the new T-Ring filter L-Pro from Optolong.
Continue reading “Ring Nebula M57 in Lyra – further testing the setup”
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