香港天文論壇

除了這 2 套合金鋁材蝸輪外，本人還有 2 套 銅製 worm wheels，359 teeth，購自日本 NTK，好多人應該未聽過 NTK 這個品牌的赤道儀。

將會用這 4套 worm gears 製作 2台 赤道儀，一台長放 YL 老家與 12.5" 肥牛一同食草耕田。另一台出走 YL 與 13.1" 瘦牛齊齊晒星光。

原來不知不覺已封印積塵近19年了，係時候要解除封印除塵。

顧名思意，質素不算差，有得留低。

1. Eta (wide field)

Taken with EF100mm F2.8L + 100Da in Guyra in 2017 @F4
20x180s @iso800, unguided with Vixen AP photoguider
Stacked and processed in PI with dark calibrated only

105. M35

Taken with DIY 6" F4 Newtonian + Vixen corrector PH + LPS + 100Da @YL on last Wednesday @570mm F3.8
30x90s @iso400, autoguided
Stacked in DSS with dark and flat calibrated
Processed in PI

A test to see the star qualtiy on an APS-C sensor.

104. M42 in Ha channel Taken with DIY 6" F4 Newtonian + Vixen corrector PH + 1600MM @YL at 20210215 @570mm F3.8 Total integration time = 3x600s, 5x120s and 5x60s in Ha @7nm Stacked in DSS with darks calibrated only Pre-processed in PI and combined in PS using layers for HDR effect A test to see if m...

Finally finsihed the distance adjustment for 1600MM imaging gears onto Vixen corrector PH for F4 Newtonians. Now it will be quite convenient to switch camera from Canon EOS DSLRs into 1600MM cooled CMOS camera with or without filter wheel.

The B&W version was taken in YL on Monday with my DIY 6" F4 Newtonian + Vixen corrector PH + 1600MM @570mm F3.8, single shot of 600s, auto level with STF in PI. The color version was taken in Taiwan with Vixen FL55SS + Vixen HD flattener + 100Da @314mm F5.7, single shot of 360s @iso1600. Level adjus...

103. Monkey nebula in Ha channel of 7nm vs 35nm Once took this object with Vixen R200SS in Ha channel @7nm some years ago in YL. Last night, imaged it again with a DIY 6" F4 Newtonian in Ha channel but @35nm bandwidth. Unfair to compare them, but maybe there is still something worthy for taking a lo...

Quite sure you have no difficulty to guess out which one was imaged without an IR blocking filter mounted onto the camera. The FWHM values of these two sets of data measured by DSS are very close, mainly betwwen 4" and 5". Taken with DIY 6"F4 Newtonian + 462C in YL @600mm F4 100 x 25s, autoguided Fo...

102. IC410

Taken with Vixen R200SS + corrector PH + 1600MM @YL in 2018 @760mm F3.8
Ha = 8x360s, autoguided
Stacked in DSS with dark calibrated only
Processed in PI and PS

101. M42 again Taken with DIY 6" F4 Newtonian + Vixen corrector PH + LPS + 100Da @YL at 20210203 @570mm F3.8 27x120s @iso400, autoguided with Vixen AXJ mount Stacked in DSS with darks and a bad flat calibrated Processed in PI and PS Also attach one light frame for your reference. Just a test to see ...

100. Eskimo

Taken with DIY 6" F4 Newtonian + LPS +UV-IR + 462C yesterday evening in YL @600mm F4
100x25s, autoguided
Stacked in DSS with dark calibrated only
Processed in PI

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