香港天文論壇

27. Mirror set of VMC110L

The spider can be made once the distance between primary and secondary is measured.

2. Mily way

55mm lens + E200S + Pentax 67 body in Coonabarabran in 2007
Single shot, exposure should be 60 min (forgotten)
Unguided with Vixen GP mount
Scanner with Nikon film scanner
Processed in PS

1. 2 clouds

Taken with 90mm F2.8 + Kodakchrome E200S + Pentax 67 in 2007 in Coonabarabran @ F2.8(?)
Single shot, exposure = 30 min (?)
Unguided with Vixen GP mount
DBE with Subtraction in PI
Processed in PI and PS

LT 的 film image 相集

Miss those old days of shooting the night skies and deep sky objects with emulsions and so build up this gallery.

26. Cage for VMC110L

Going to modify Vixen VMC110L scope. Firstly make a cage to replace the left one (original cage) so that the optical axis of the secondary mirror and
meniscus lens assembly can be adjustable.

179. NGC7000

Totally forgot where it was taken.

Vixen VSD100F3.8 + 1600MM in July in 2017
5x600s @-10C + 3x600s @-15C in Ha channel @7nm bandwidth
Integration of 2 sets of data taken in 2 separate nights
Stacked in PI and DSS
Processed in PI and PS

原本想帶Baby VSD (FL55SS) 去影花展，但找不到接無反機轉接環，就只有帶部M6 + kit lens 15-45mm去維園學人影花花

24. Scorpius is falling down

Sigma 15mm f/2.8 + unmodified 1100D in Canberra in 2012 @f/4
Single exposure of 13s @iso1600
Stationary
Auto stretching in Window picture viewer

23. South pole

Taken with Sigma 15mm f/2.8 + unmodified 1100D in Canberra in 2012 @f/2.8
13s @iso800
Stationary
Processed in PS

Waning gibbous moon high up in the sky and gusty wind

22. Setting milky way

Taken with Sigma 15mm f/2.8 + 100Da in Coonabarabran in 2013 @f/2.8
Single exposure of 180s @iso800
Unguided with Vixen GP mount
Processed in PI and PS

178. M57 reprocessed Before erasing the data from the HDD, gave them reprocessed again with flat calibrated. Taken with DIY 30cm F4 Newtonian + TV paracorr + LPS + 100Da @PTC in 2015 @1380mm F4.6 7x180s @iso400, with dark, bias and flat calibrated in PI Autoguided with Vixen AXD mount Bortle 7-8 sky...

177. NGC5139 reprocessed Before erasing the data from HDD, gave them reprocessed again with flat calibrated. Taken with Vixen VC200L + reducer + unmodified 6D @PTC in 2015 @1280mm f/6.4 6x240s @iso800, with dark, bias and flat calibrated in PI Autoguided with Vixen SX2 mount Bortle 7-8 sky Reprocess...

Reprocessed again with not so aggressive curve stretching, and seems this one looks not so grainy than the previous one.

176. M42 reprocessed

Taken with Vixen ED80Sf + reducer + LPS + 100Da @TMS in 2014 @510mm F6.4
10x360s @iso400, with dark, bias and flat calibrated in PI
Autoguided with modified Vixen GP2 photo guider in RA direction only
Bortle 7-8 sky

175. M51 (wide field) reprocessed

Maybe you don't agree to me that this is one of the beautiful area of our deep sky.

ED80Sf + reducer + LPS + 100Da @510mm f/6.4
7x360s @iso800, Bortle 7-8