DSO 遺照集 -- NGC7000

[Eddy So]

[Wongsir]

[LT]

That is a cropped and reprocessed version of M42 taken with FL55SS in 2018

Hope I can go to some places with darker sky than that at PTC in Hong Kong this year to achieve a better result with this little scope FL55SS.

FL55SS + flattener + LPS + 100Da @PTC in 2018 @315mm F5.7
20x120s @iso1600, autoguided with Vixen AP mount
Stacked and processed in PI, calibrated with darks only
Final touch in PS

crop_M42_20181005_FL55SS_F5-7_100Da_iso1600_20x120s_PTC.jpg (1018.35 KiB) 已瀏覽 2132 次

[Eddy So]

[Wongsir]

[LT]

117. NGC7000

At that night, shot NGC7000 specially and so had taken 41 light frames. However, the sky quality at PTC is becoming poor and poor year by year. The result was quite disappointed.

Taken with Vixen FL55SS + flattener + LPS + 100Da @PTC in 2018 @315mm F5.7
41x120s @iso1600, autoguided with Vixen AP mount
Stacked in DSS with darks calibrated only
Processed in PI and PS

Attached one light frame for your reference what the sky quality it was at that night.

FB_Autosave_PS_2.jpg (1.06 MiB) 已瀏覽 1984 次

Light frame

FB_IMG_6929.jpg (275.21 KiB) 已瀏覽 1984 次

[Eddy So]

[LT]

118. Double cluster taken in Mountain Yinna

Taken with Vixen VSD + 40Da in Mountain Yinna in China in 2014 @380mm F3.8
13x60s @iso1600, unguided with Vixen GP2 photoguider
Stacked in PI with 5 darks calibrated only
Processed in PI

My first time to Mountain Yinna. If my memory is correct, quite much cloud in the sky after dusk at the the first night but clear up for a while in the pole region. Then set up gear in the shortest time and did the polar alignment as quick as possible. But I found I had made a mistake of not doing the alignment well after shooting the Double Cluster without any autoguiding.

Moreover, maybe the total integration time is not sufficient. The result is not good, the colors on the stars not so obvious. However, the PCC curve seemed quite perfect.

Double Cluster

2clusters_20141120_VSD_40Da_iso1600_13x60s_Yinna.jpg (1006.28 KiB) 已瀏覽 1921 次

PCC curve

2clusters_printscreen_PCC.jpg (754.64 KiB) 已瀏覽 1921 次

[Wongsir]

[LT]

A reprocessed one

taken with DIY 6" F5 Newtonian + MPCC + LPS + 350Da @PTC in 2008 @750mm F5
8x360s @iso400, autoguided with Vixen SXD mount
Stacked and processed in PI with 3 darks calibrated only
Final touch in PS with layer mask for HDR

FB_M42_20081206_6F5_MPCC_LPS_350Da_8x360s_iso400_PTC_HDR.jpg (1.22 MiB) 已瀏覽 1870 次

[Eddy So]

[LT]

A reprocessed version in HDR

Taken with DIY 300mm F4 Newtonian + paracorr + LPS + 100Da @PTC in 2015 @~1380mm F4.6
10 x 120s @iso800, autoguided with Vixen AXD mount
Stacked and processed in PI with dark calibration only
Final touch in PS

see if the smaller size looks a bit smoother.

1200 x 791 pixels

FB_2015_300F4-6_LPS+100Da_10x120s_iso800_PTC.jpg (1.06 MiB) 已瀏覽 1834 次

600 x 396 pixels

FB_50%_2015_300F4-6_LPS+100Da_10x120s_iso800_PTC.jpg (249.48 KiB) 已瀏覽 1834 次

[Eddy So]

[Wongsir]

[LT]

120. M42 with L combined

On December 3rd, went out to Sai Kung for shooting the comet A1. While waiting for it to rise, shot M42 with SD115S for killing time. However, the focus was getting out more and more as the scope cooled down to ambient temperature. So as not to waste this set of color data, attempted to use the L data taken with R200SS + Atik 383L+ mono cooled CCD camera to give a new life to the color data, and luckily, managed to get a finer color image of this great nebula. If the SN ratio of the M42 in L channel was higher, the result would be much better I think.

M42 with L combined (L = 5x240s)

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Out-focused color M42 taken with SD115S

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