香港天文論壇

Thank you. Here is some update of today. inside focal: http://i913.photobucket.com/albums/ac331/bigtrumpet/IMG_20180623_182712_infoc_zpsyeaccude.jpg focal: http://i913.photobucket.com/albums/ac331/bigtrumpet/IMG_20180623_182519foc_zps04ktrhvw.jpg outside focal: http://i913.photobucket.com/albums/ac3...

Well noted Chanlunlun, Thanks for reminding me, that to start a polishing session, it must begin with a good hot pressing first. I also do a cold press after a 15 minutes polishing, for 10 minutes or bit more. Just updated the progress: inside focal: http://i913.photobucket.com/albums/ac331/bigtrump...

Subaru,

有意, 請看 PM

thanks

Joseph

Thanks Mirror god!! Past few days, as a bit too busy [ or lazy ;) ]to go back to #1200 and making a new pitch lap, I spent a few more hours with the pitch lap I am now using: some ways to try to improve the rolled edge: 1. more frequent cold press for good contact 2. hands placed in the center of th...

應該是這款 Star Adventurer mini 的 OEM 板

http://skywatcher.com/product/star-adve ... mini-wifi/

最好同時 比較 Star Adventurer , 哪款較合適你

http://ca.skywatcher.com/product/produc ... dventurer/

Star Adventurer 負重大一點

正!!

So I think the turned down edge is top issue for me to tackle first.

Will be it like going back to #1200, and grind with 1/3 W stroke?

Hello Chanlunlun,

it is 8 inch, f/6

thanks for your tips!!

焦內: http://i913.photobucket.com/albums/ac331/bigtrumpet/IMG_20180605_004742_infoc_zpshmffq5cb.jpg 焦點: http://i913.photobucket.com/albums/ac331/bigtrumpet/IMG_20180605_004922_foc_zpsc6ajfu4a.jpg 焦外: http://i913.photobucket.com/albums/ac331/bigtrumpet/IMG_20180605_005219_outfoc_zpslfopmzef.jpg 發現中央有山,...

RIP

這網址是關於他生平,出版箸作,電視節目, 電影等

http://www.hawking.org.uk/

有沒師兄師姐見過這款調焦座? 是哪牌子的出品?

50多年前的紀錄片段, 好珍貴. 尾段有談及 60cm反射鏡
http://hicbc.com/special/6039/contents/39_0112lens/