香港天文論壇

Taken with unmodified 100D + EF24-105mm F4L zoom lens @24mm F4 in Gladstone in 2014
Single shot of 120s @iso3200, tracked with Vixen star tracker Polarie @0.5x sidereal speed

Taken with EF75-300mm L zoom lens + modd 5DmkII + Vixen AP photo guider in 2016 in Darwin district @300mm F5.6 18x240s @iso800, air temperature > 30C 用Canon的DPP將單張RAW轉換成TIFF，出來的顏色頗"豐富"和吸睛。所疊的影像用PI中的PCC來做color calibration，出來的顏色，主觀上仍覺有點怪怪和不足，所以試試新方法看看效果怎樣。假設： 1. 若以RAW拍攝，R,G,B三色會以線性形式記錄下來； 2. 若用Canon的D...

Taken with Vixen ED81SII apo + SD reducer kit + 3.8 micron cooled cmos camera + AP non-goto mount @人肉 goto mode R=G=B=6x180s @-15C with bias, darks and flats calibrated in PI @495mm F6.1 Data captured with SGPro in NZ in 2018 @ very windy condition ocassionally Color calibrated with PCC in PI. If PC...

Final product, combined data obtained from 2 nights @PTC and TMS separately. All data taken with Vixen AP non-goto mount + ED81SII apo + HD flattener @640mm, F7.9 R=G=B=6x300s(PTC)+5x300(TMS) @-10C, with bias and darks calibrated in PI SNR still very low due to too much pollutant in the air and M27 ...

Had an idea on how to reduce the impact of light pollution on imaging deep sky objects and so went out to PTC on last Friday night to take a trial. But it was a bit late to get there. Not much time to take data. Moreover, the transparency was low too. Taken with ED81SII apo + flattener HR + 1600 MM...

Taken with Vixen AP mount + ED81SII APO + HD flattener again last night but at TMS.

R=G=B=5x300s with bias and dark calibrated in PI, autoguided.

The sky was so hazy that the polaris could only barely seen with naked eye!!!!

Had an idea on how to reduce the impact of light pollution on imaging deep sky objects and so went out to PTC on last Friday night to take a trial. But it was a bit late to get there. Not much time to take data. Moreover, the transparency was low too. Taken with ED81SII apo + flattener HR + 1600 MM-...

Use my own way to blend Ha data on L channel taken with 1600 MM-C and R channel taken with 100Da. Of course not a correct method of merging narrow band data, and so the final image may look a bit weird L=27x45s, Ha=4x240s, 100Da=5x60s, without any calibration in DSS All taken with AP mount + 6"F4 ne...

人肉 goto

DIY 6"F4 牛牛 + Vixen 1.4x extender PH + 1600 MM-C @840mm F5.6 in YL last night
Ha = 4x240s without any calibration in DSS
Autoguiding: Vixen non-goto AP mount + 4cm guiding scope + QHY5LII-M + PHD2 with breeze occassionally

Seems Vixen new 1.4x extender for R200SS newtonians work quite well with my DIY 6" F4 travel newt.

Taken with 100Da @TMS on September 20th @840mm F5.6
5x60s @iso800
Autoguiding with AP mount + 4cm guiding scope + QHYL-IIM + PHD2

If photographic focal length is not longer than 3000m + seeing is not so stable, don't attempt to take this object.

Taken in 2013 with VC200L + reducer + 100Da @PTC
6x240s @iso800
Autoguided with SX2 mount + 5cm guiding scope + 2x + QHY5 + PHD

Except mirrors, all were made by me. However, the original OTA is still too bulky to be transported to overseas for astronomy. Moreover, the MPCC3 doesn't correct the coma aberration so well. So, I need to rebuild the OTA and tailor make a focuser for installing Vixen's corrector PH and 1.4x extende...

If Vixen VC200L is well collimated, it will be a good killer on imaging small deep sky objects. If the spider structure and tubing design, mainly interior, the bright star will display much beautiful on screen. I will re-construct my VC200L after finishing my 6" F4 travel newt. Single frame taken in...

*** Due to the image can only be viewed after logging in on the sub-page of "TATScope", I repost this thread on this sub-page. Moderator please delete it on "TATscope" sub-page, if no double posting is allowed. Thank you very much. *** DIY an adapter for the connection between Vixen AP mount and Sta...

DIY an adapter for the connection between Vixen AP mount and Star Book Ten controller so that the AP mount can run goto function for either visual or imaging purpose. Finally had time to test it on last Sat evening, though big gibbous moon still high in the sky. This three objects were imaged with a...