DSO 遺照集 -- NGC7000

[Eddy So]

[LT]

62. M51 from TMS with ED80Sf

Taken with Vixen ED80Sf + reducer + LPS + 100Da @TMS in 2014 @510mm F6.4
7x360s @iso800, autoguided with Vixen photoguider in RA direction only

M51_20140129_ED80Sf_reducer_100Da_iso800_7x360s_TMS.jpg (1004.3 KiB) 已瀏覽 2295 次

Cropped image

M51_20140129_ED80Sf_reducer_100Da_iso800_7x360s_crop_TMS.jpg (594.24 KiB) 已瀏覽 2295 次

[LT]

63. Core of M31

Taken with DIY 30cm F4 Newtonian + paracorr + LPS + 100Da in PTC in 2015 @1380mm F4.6
21x240s @iso800, autoguided with Vixen AXD mount
Stacked in DSS and processed in PI and PS with HDR applied

That film product of TV paracorr (coma corrector) doesn't work well on correcting the coma even on an APS-C sized sensor. It will be replaced by a Vixen corrector PH soon this year.

M31_20150909_300F4_100Da_iso800_21x240s_TMS.jpg (1.26 MiB) 已瀏覽 2274 次

[Eddy So]

[LT]

64. Eskimo

Taken with Vixen VC200L + reducer + LPS + 100Da in PTC in Hong Kong in 2013 @1280mm F6.4
6x240s @iso800, autoguided with Vixen SX2 mount
Stacked in DSS and processed in PI and PS with HDR applied

Without doing any HDR, the object will look over. So, if re-visiting it this winter, the exposure needs to be shorter. Moreover, longer photographic focal length seems necessary too.

Eskimo_20131204_VC200L_FR_100Da_iso800_6x240s_PTC.jpg (635.01 KiB) 已瀏覽 2256 次

[littleming]

[Eddy So]

[LT]

Core part of milky way

Taken with EF35mm F2 lens + 100Da in Lantau Island in 2016 @F4
5x240s @iso800, unguided with Vixen Polarie star tracker
Stacked in DSS and processed in PI and PS

That is a reprocessed version. Remember at that night the sky conditions were not so good as there was mist occassionally. When it went, the transparency was good. Hope I can go to this spot again this year for astronomy.

Sagittarius_20160724_EF35mmF4_100Da_iso400_5x240s_Lantau.jpg (1.09 MiB) 已瀏覽 2154 次

RAW frame

Sagittarius_RAW_IMG_5048.jpg (189.28 KiB) 已瀏覽 2154 次

[Eddy So]

[LT]

Forgot this is a gallery of DSO, and so cancel the image no. of my milky way image.

[LT]

65. M27 with VC200L + 5Da

Taken with Vixen VC200L + reducer + LPS + 5Da @PTC in 2015 @1280mm F6.4
15x240s @iso800, autoguided with Vixen SX2 mount
Stacked in DSS with darks calibrated and processed in PI. Final touch in PS

Seeing was quite good at that night. Also, transparency was quite high too. That resulted in blue signal stronger than usual.
Look forward to redoing it with my 30cm DIY newtonian soon this summer.

M27_20150616_VC200L_FR_5Da_iso800_15x240s_PTC.jpg (1.05 MiB) 已瀏覽 2096 次

[Eddy So]

[LT]

Should have no difficulty to distinguish which one was taken with VC200L and another with ED115 apo (115mm F7.7). Could you guess out which one was taken at the night of higher transparency?

Both were taken with 5Da, but at different nights in June in 2015 in Hong Kong
15x240s @iso800 vs 41x90s @iso400
Stacked in DSS and processed in PI

M27_comparison.jpg (1017.85 KiB) 已瀏覽 1991 次

[Eddy So]

[LT]

66. M51 with unmodified 100D

Taken with Vixen VC200L + reducer + unmodified 100D @PTC in 2015 @1280mm F6.4
12x240s @iso800, autoguided with Vixen SX2 mount

SN ratio is quite low due to light pollution. My best effort on processing it just with stretching in Level, Curve and some layer masks.

M51_20150414_VC200L_FR_100D_iso800_12x240s_PTC.jpg (707.81 KiB) 已瀏覽 1567 次