香港天文論壇

鄧，，thanks for your suggestion。using a camera with live view focusing is the best and it may be my next step。500D is reasonable in second hand market now。time to leep， food night [掰掰] [打瞌睡]

你有photoshop 的話可以用layer mask來修改，可以跟下面條link做

http://www.youtube.com/watch?v=FOAmP7A_x6c

Tarepanda 寫:很不錯呀
要把300d操作好真不容易
特別是對焦
review又要花很多時間

用眼對焦唔用易，不過目視對好而相片放大沒有甚麼問題就比部相機自己行算數

It is actually very difficult to use a Bahtinov mask on a 100mm lens. Focusing with a 300D (no live view) is a nightmare. 鄧登凳, it's tough to do focusing in the small window at night especially I am focusing a tiny star. Using a Bahtinov mask is a bit help but I have to guess the star is focused or ...

300D modified, 36mm and 100mm, ISO800

amazing 16mm can allow 65s exposure!!

Skyobs 寫:Suggest scale photo to 800-1600 pixels horizontal for easier reading in forum posts. It would be much more tolerant to imperfection in focusing and tracking too.

Skyobs, Thanks for your suggestion. Let me try it!!

excellent

LT 寫:focal length = ?

Suggest using a mask to get more accurate focus.

LT， it was about 100mm in full frame。i wasn't use a mask in the night but it was a good suggestion to use a mask for focusing

Thanks

Left Sek O before the Galaxy on the sky. Only got a little time to test machine function. Modified 300D, 60s x 5, ISO800, Vixen Polarie Enjoy.

good job [蔥寶恭喜樣]

amazing universe and excellent photos

cannot see the images