香港天文論壇

one more photo : the trolley allow me to carry the GPDX + tripod to TKO site A. the trolley is so smooth such that I only use 2 fingers to tow the whole trolley ( which is near 60lb) into the site

hi,

some people asked me about my M15 air gun bag to use as tripod bag. attached pls find teh picture of it and the little blue square at the lower right is actually a CD box. the tripod shown is a Vixen Hal 110 + Tan 14-made shoulder joint ( black part attached to the tripod)

Dear Doucat, I 'd also like to have a copy of your file, would you pls also send me a copy. thanks.... Gary125 p.s. what is the file format of "freehand"? Can I just open it in MS office series software ? 咦咦. 我應該 send 左個 private message 俾你, 你睇睇收唔收倒個 private message? 可以 click 下面張圖指住果度入去 check check. ...

some company selling "ronchi testers" ( pls refer to the following link) http://www.astrovid.com/ do the principle similar to your split source ? (I know nothing in testing the perfectness of a telescope) :-? :-? Pls discuss. Many thanks 圖中是5lines/mm的局部放大. 細心可發現部份地方的線是比較粗的,原來的大小則會很明顯. 不知有無行家能解說其中道理?...

Nothing to say.... you are very hard working and have produced good result

Passerby-B 寫:

daniel cck 寫:昨睌十時多回家，抬頭望天終於見到小許清天，木星、月球也出來了。

真係上左身

Pls refer to the attached file . a) the left one is is in golden colour is the canon wide lens adaptor for A70. you can buy this stuff in DC shops in Mk ( 52mm screw size). Original canon adopter is made of plastic and I 'd suggest you buy "lo fan" which are made of metal ( as shown) b) the right on...

Thanks for the info. everything is clear now.

noodle 寫:u can check this web site for detail

http://www.novac.com/solar/solar4.htm

Just a side issue and wanna to ask: I 've seen the H-alpha sun image from some ameturs in HK . I learned from my old AL Chemistry that when electron flow from higher quantum state to lower quantum state, light energy is emitted. Should the H-alpha filter actually captured the light from the 1st quan...

yes! I also prefer the tone of Jupiter taken by LT. that's why I process my Vc200L image at another thread. of course, much to be learnt for my image processing technique.... LT your Planet is really my kind of image,very solid and natural feeling! Is it the kind of taste for old fellows? :mrgreen:

hi, the image is updated. I wish to make the Jupiter like the tone of that processed by LT , however, some tricks have to be sought. you are welcome to take this file and reprocess it

Petming, awaiting your version

Hi, attached please find the image of Jupiter taken by New Vc200L at 3:00 UT on Mar 8. The image was taken by Petming and Gary125 and details as follows: seeing 3-4 /10, transparency 4-5/10, Vixen new Vc200L / GPDX/Ss2k system, Vixen deluxe 2x barlow. totally 900 frame stacked. image processing by g...

Petming used Or 9MM + Ga-4 + Ss100 for guiding and the effective power was 226x at that time. as Ga-4 has a 3x barlow built-in, therefore, I call it as "3mm" ep for simplicity but it caused confusion. Dear Petming, May be 3mm is too short and too dim to find guiding stars. Try other longer focal len...

where did it taken ? after the moon rise or before ? BTW, your photo already proved that the eq mount is capable for your new coming scope...... :-D 首先多謝你們比了十分多意見改正了我對pole的問題﹐昨天見個天鬼死清立刻出動再一次影M42,不過實在太匆忙啦﹐我又唔知道月光十點幾出來﹐真正影的時候都九點幾囉﹗﹗﹗ 原來guide星對我來講十分困難的﹐即使我手頭上有GA-4與ToUcam都用唔到guide星,最後只好用6.7mmEP(沒有十字的目鏡下...

you know, I 'm novie in astrophotography. However, people sugegst me in wanchai 龍影 because the boss 's son are also astro guy... it is just located at the opposite of wanchai 298 mall.

豆豸苗 寫:唔知 m42_1.jpg 果張上面痕係菲林本身花左, 還是係塵呢?
似乎外面0的曬相舖質素都好參差.....

其實想問下影過菲林天文相0既同好, 有冇邊間曬開相0既相舖好介紹啊? ^^

Petming, in your 1st step on settinmg the time circle, you forget to offset the time circle : as HK is +114 E, therefore, it is -6 degree(i.e. west side) of central median of +120 E ( which is +8 hour to UT) . so, you need to set the time circle of -6 W , instead of pointing to the zero position. th...