2017年美國日全食
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- 夸克星
- 文章: 3847
- 註冊時間: 週四 09 10月, 2003 21:06
Re: 2017年美國日全食
現在距離出發日子尚有6天,正是未出發先興奮。將會帶同4吋RFT一支觀看食甚時的太陽,另20號晚上亦可用作 Salem 郊外觀星之用。
Re: 2017年美國日全食
鏡神出中文Chanlunlun 寫: ↑週四 03 8月, 2017 10:33現在距離出發日子尚有6天,正是未出發先興奮。將會帶同4吋RFT一支觀看食甚時的太陽,另20號晚上亦可用作 Salem 郊外觀星之用。
Anyway, have a nice trip
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- 夸克星
- 文章: 3847
- 註冊時間: 週四 09 10月, 2003 21:06
Re: 2017年美國日全食
Thanks Mr. Tang.
Where will you go ?
Where will you go ?
Re: 2017年美國日全食
Rexburg, Idaho
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- 夸克星
- 文章: 3847
- 註冊時間: 週四 09 10月, 2003 21:06
Re: 2017年美國日全食
明天就耍出發,心情異常興奮,沿途會帶着4吋的RFㄒ,郵輪上覌星和覌看食甚。 [樂奔]
- 附加檔案
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- 4吋RFㄒ,鏡龄超过三十年
- RFT.JPG (125.27 KiB) 已瀏覽 1958 次
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- 夸克星
- 文章: 3847
- 註冊時間: 週四 09 10月, 2003 21:06
Re: 2017年美國日全食
For telescope of this size, it is heavy - 2.2 kg for a 4 inch RFT.
While building this telescope 30 years ago, the dominating design philosophy was to use as much metal as possible for rigidity and so you could see that the telescope is using aluminium end rings, bronze focuser and other metallic parts and all these added to the total weight.
The only contemporary idea by that time was the very short focal length - at f/3.5 this little charm becomes very handy and easy to be put into any luggage baggage. And this scope could be capable of reaching as low as a power of 14X, giving a total field of view of nearly 5 degree !
While building this telescope 30 years ago, the dominating design philosophy was to use as much metal as possible for rigidity and so you could see that the telescope is using aluminium end rings, bronze focuser and other metallic parts and all these added to the total weight.
The only contemporary idea by that time was the very short focal length - at f/3.5 this little charm becomes very handy and easy to be put into any luggage baggage. And this scope could be capable of reaching as low as a power of 14X, giving a total field of view of nearly 5 degree !
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