香港天文論壇

85. Leo Triplet taken with cooled CCD Taken with Vixen R200SS + MPCCIII + Atik 383L mono cooled CCD @PTC in 2017 @800mm F4 R=G=B=4x240s @binning 2x2, autoguided with Vixen SX2 mount Stacked in DSS with bias calibrated only Processed in PI and PS Why no dark was calibrated? It is because the sensor t...

Thanks for your appreciation.

一年一聚，今年難料，盼望十月，泡湯去了！

Single shot of 360s, unguided with Vixen photoguider
EF17-40mm F4L + 300Da in Gisborne in 2008 @17mm F4
Calibrated in DSS with 1 dark only

84. M42 taken with cooled CCD Vixen R200SS + MPCCIII + LPS + Atik 383L mono cooled CCD @PTC in 2015 @800mm F4 R=G=B=3x240s @binning 2x2, autoguided with Vixen SX2 mount Stacked in DSS with bias calibrated only Processed in PI and PS Now, have known more tricks on imaging with CCD in Hong Kong, and s...

83. M45 taken with cooled CCD Vixen VSD100F3.8 + LPS + Atik 383L mono cooled CCD @PTC in 2015 @380mm F3.8 LRGB = 6x360s : 2x360s : 2x360s : 6x480s, autoguided with Vixen SX2 mount Stacked in DSS with darks and bias calibrated Processed in PI and PS R channel is a bit out of focus, and so it results ...

購於美國天文店舖，曰本製作。若沒記錯，原價要 千多元港幣。買入後非常少用(<5次)，鏡面條件非常良好。

HK$600.

有興趣者，請PM本人或貼文回覆，謝謝。

82. M106 wide field Taken with Vixen VSD100F3.8 + Atik 383L mono cooled CCD @PTC in 2015 @380mm F3.8 LRGB = 20x240 s: R=G=B=5x120s @binning 2x2, autoguided with Vixen SX2 mount Stacked in DSS with darks and bias calibrated Very unfortunately, when combining LRGB in PI, one bright star failed to the ...

81. NGC6888

Taken with Vixen VSD100F3.8 + LPS + Atik 383L mono cooled CCD in TMS in 2016 @380mm F3.8
LRGB = 10x240s : 2x240s : 2x240s : 3x240s @-10C, autoguided with Vixen SX2 mount

不見一日，何只三秋；相思之苦，誰可共鳴。問君可有 "大飛"，能載我往南去？

Cropped, 2 x 180s @iso1600, unguided with Vixen AP mount @photoguider mode
EF100mm F2.8L + 100Da @F4

Or, this one, Vixen Polarie U, may fit your purpose.

原本買入這個 NLVW30mm (2" size) 目鏡是想配合13.1" F4.5 牛牛 和 VC200L 作深空目視觀測用，現因日後會用雙目裝置 (binoviewer) 作目視觀測用，所以放售。

全新並未使用過， 售 HK$950。

有興趣者，請 PM 本人或回覆貼文，謝謝。

10多年前買入這個 TV paracorr 彗差修正器 (2" size)，原本打算用於 13.1" F4.5 牛牛作深空天體目視觀測用。後因過於投入天文攝影而放下了目視觀測，就這樣長期存放防潮箱內被冷落。早幾年，曾想將它改造成攝影用途，配合F4 - F5牛頓鏡用。不過近年攝影熱誠大減，返回使用雙目裝置目視，所以決定再放售，好讓其他同好可更善用它。

全新並未使用過，鏡面鏡身的條件狀況光潔如新，售 HK$2200.
(參考： 全新TV paracorr 二代在美國OPT店售 US$486.01)

有興趣者，請PM本人或回覆貼文。

匆忙set up，對焦欠準，無quality可言，人有我有也

The SN ratio of the stacked image of the Ring in L channel seems much higher than that of the image taken with 100Da. After combining the color signal into the L channel, Try combining the color data taken with 100Da into the L channel to see if the resulted color image of the Ring is improved quite...