香港天文論壇

每次到年尾就會有什麼什麼回顧, 也就來一個回顧. 回望半世人生, 曾DIY過那些望遠鏡呢？ 1. 5cm F20 單鏡片紙筒折射式望遠鏡 2. 8” F5 牛頓式反射望遠鏡 3. 12.5" F6 牛頓式反射望遠鏡 4. 8cm F7.5 消色差折射式望遠鏡 5. 10cm F3.8 消色差射式望遠鏡 6. 10" F6 牛頓式反射望遠鏡 7. 12.5" F5 牛頓式反射望遠鏡 8. 8" F6 牛頓式反射望遠鏡 9. 10" F15 卡式反射鏡 10. 10“ F3.5 牛頓式反射望遠鏡 11. 4.5" F5 牛頓式反射望遠鏡 12. 10" F4.7 牛頓式反射望遠鏡 13. 8" F...

168. M33 A combination of L data taken at the beginning of this month this year and RGB data taken in 2018 L data: 35x300s with flat, dark and bias calibrated in PI, Bortle 7-8 Vixen SD115S apo refractor + HD flattener + 1600MM @PTC @908mm F7.9 Autoguided with SXD2 mount RGB data: R=B=G=8x300s captu...

21. Offset secondary mirror holder

Making an offset secondary mirror holder for my travel Newtonian 6" F4.

Below shows two images with color calibration in two different tools separately after using DBE tool in PI. One was applied with unlinked STF for brightness adjustment directly while another was brightness adjusted using linked STF after PCC tool applied. Then both were inputted into PS for fine adj...

20. Pair of tube rings for Tak Sky90 scope was finished last week.

Reprocessed version.

Does this version look a bit better or worse than the previous one above?

32. Milky way in August

Taken with Sigma 15mm f/2.8 lens + 40Da in Australia in 2013 @f/4
12x360s @iso800, with dark calibrated only
Unguided with Vixen Polarie star tracler
Processed in PI and PS

My first success in using PCC for color calibration in PI @f.l.=15mm

The filter wheel of my ZWO EFW mini had been failed to rotate for changing filters for more than 1/2 year. Tried to update the latest version for drivers but no success. So, I thought that might be a fail in electronics and then left it untouched. A couple of days ago, a flash came in my brain. Is t...

20. Star trail

Taken with EF8-15mm f/4L fisheye USM + unmodified 100D in Australia in 2014 @15mm f/4
Single shot of 363s @iso400 with ICNR on
Stationary
Processed in PS

9. LMC and SMC

Taken with Sigma 15mm f/2.8 + unmodified 1100D in Australia in 2012 @f/2.8
Single shot of 20s @iso3200 with ICNR on, stationary
Processed in PS

19. Tube rings for Sky 90

Milling tube rings for Takahashi Sky 90 scope for my friend.

19. Cygnus

Taken with EF24-105mm f/4L + 100Da @PTC in 2015 @32mm f/5.6
Single shot of 120s @iso1600, unguided with Polarie star tracker
Processed in PI and PS

18. Adapting plate for installing Vixen SX series mount onto HEQ 2" stainless tripod

31. LMC of total 168 min data

Taken in two nights
20231010: 12x240s @iso1600
20231017: 30x240s @iso800

30. LMC

Taken with EF100mm f/2.8L macro USM IS + 100Da in Australia in 2023 @f/4
12x240s @iso1600, with dark, bias and flat calibrated in PI
Autoguided with Vixen AP mount
Processed in PI and final touch in PS