Comparison between mask and no mask used

[LT]

M15
Taken with DIY 6" F4 Newtonian + Vixen 1.4x extender PH + 100Da in September last year in TMS @840mm F5.6
15x60s @iso1600 with bias calibrated in PI only
Autoguided with Vixen AP non-goto mount @ windy condition occassionally

In 2020 and afterwards, this newtonian will be one of my main scopes for trips to overseas for both deep sky imaging and eyeballing.

M15_15x60s_DBE_crop_PI.jpg (1011.21 KiB) 已瀏覽 648 次

[Eddy So]

[LT]

Try to see the difference if mask is applied.

M15_mask-no-mask.jpg (1.01 MiB) 已瀏覽 597 次

[Eddy So]