IR blocking filter necessary to 462C for deep sky imaging

[LT]

Quite sure you have no difficulty to guess out which one was imaged without an IR blocking filter mounted onto the camera. The FWHM values of these two sets of data measured by DSS are very close, mainly betwwen 4" and 5".

Taken with DIY 6"F4 Newtonian + 462C in YL @600mm F4
100 x 25s, autoguided
For the one with IR blocking filter, one more LPS filter was used also.

M1_comparison_6F4_YL.jpg (1 MiB) 已瀏覽 563 次

[Eddy So]

[Wongsir]