香港天文論壇

175. M51 reprocessed Taken with Vixen ED80Sf + reducer + LPS + 100Da in Tai Mo Shan in 2014 @510mm f/6.4 7x360s @iso800 with dark, bias and flat calibrated in PI Autoguided with modified Vixen GP2 photo guider in RA direction only Processed in PI and PS Reprocessed with flat calibrated to get rid of...

25. Another version of spider

DIY this spider for replacing the existing one installed in my 6" F4 travel Newtonian.

11. Milky way taken in SA

Taken with EF8-15mm f/4L + unmodified 6D in South Australia in 2015 @15mm f/4
Single shot of 300s @iso1600
Unguided with Vixen Polarie star tracker
Processed in PS

24. Spider of my DIY 6" F4 Newtonian

Very unfortunately, this spider failed to hold the secondary mirror firmly, and so it needs to be replaced by another much more stronger.

10. Milky way high over in the sky

Taken with EF8-15mm f/4L + unmodified 6D in Australia in 2015 @15mm f/4
Single shot of 240s @iso2000
Unguided with Vixen Polarie star tracker
Processed in PS

23. 6" F4 Newtonian OTA

Seems I can bring this Newtonian with my trips to oversea this year.

21. Vertical milky way

Taken with Sigma 15mm f/2.8 + unmodified 1100D in Coonabarabran in 2012 @f/2.8
25s @iso1600
Stationary

174. M42 (a stack of 3sets of data) This is a stack of the following sets of data taken with same aperture Newtonian of 6" F4 + Vixen coma corrector PH in Yuen Long @570mm F3.8 1. 15x300s taken with ZWO 071C cooled camera at 20221221, 2. 25x120s @iso400 with 100Da at 20240103, and 3. 41x120s @iso400...

173. M42 taken with 6" F5 Newtonian Taken with my DIY 6" F5 Newtonian + TV paracorr + 100Da in Yuen Long last night @875mm F5.75 12x60s @iso800, with dark, flat and bias calibrated in PI Autoguided with Vixen SXD2 mount Transparency = 8/10 and 1st half moon Just a test shot to check for the diffract...

172. M42 (2 night data)

A result of combinning 2 sets of data taken in Yuen Long on Jan 3rd and Jan 14th separately with the same setup of 6" F4 Newtonian + 100Da

Jan 3rd: 25x120s @iso400
Jan 14th: 41x120s @iso400
Total integration exposure = 132 mins

171. M42 (2nd try) Taken with DIY 6" F4 Newtonian + Vixen coma corrector PH + LPS + 100Da in Yuen Long on Jan 14th @570mm F3.8 41x120s @iso400, with flat, dark and bias calibrated in PI Bortle 8, transparency = 7-8/10 Processed in PI and PS Tried to figure out the reasons causing these urgly diffrac...

22. Tube rings for 6" Newtonian

Tailor made a pair of tube rings for my travel 6" F4 Newtonian last week so as to reduce the weight of the whole setup brought wirh my trips to overseas later.

Reprocessed with flat calibrated.

170. M42

A test shot taken with my DIY 6" F4 travel Newtonian last night

6" F4 Newtonian + Vixen corrector PH + LPS + 100Da in YL last night @570mm F3.8
24x120s @iso400, with dark and bias calibrated in PI
Autoguided with Vixen SXD2 mount
Processed in PI and PS

169. NGC3372 Eta Carinae Nebula

Taken with Vixen FL55SS + reducer + M6a in Australia in 2019 @234mm F4.3
15x150s @iso1600, with dark calibrated only in PI
Autoguided with Vixen AP mount
Processed in PI and PS