SonotaCo.JP
SonotaCo Network Japan Forum
SonotaCo.JP Forum Index
homeTop Page  FAQFAQ   検索検索   メンバーリストメンバーリスト   ユーザーグループユーザーグループ   登録する登録する 
 プロフィールプロフィール   プライベートメッセージをチェックするプライベートメッセージをチェックする   ログインログイン 

Fireball Spectrum
ページ移動 前へ  1, 2, 3 ... 12, 13, 14
 
新しいトピックを投稿   トピックに返信    SonotaCo.JP Forum Index -> UFOCapture BBS in English
前のトピックを表示 :: 次のトピックを表示  
投稿者 メッセージ
Bill W



登録日: 2012.02.13
記事: 129
所在地: Glasgow

記事日時: Fri Oct 13, 2017 6:10 am    記事の件名: 引用付きで返信

Hi,
I've been having some really poor weather recently. 25mm+ (sometimes up to 50mm) of rain in 24 hours day after day. Quite a lot even for my part of the world in a short space of time Sad

However I did have quite good night last week with a variety of results across various systems. I've been experimenting with 25mm and a couple of 50mm lenses.

Heres a short video is the various meteors.

https://youtu.be/EqVVNOun3YI

cheers,
Bill.
トップに戻る
ユーザーのプロフィールを表示   投稿者のウェブサイトに移動
Skymagic



登録日: 2016.07.26
記事: 6

記事日時: Tue Nov 14, 2017 10:17 pm    記事の件名: 引用付きで返信

Dear all, hello!

I from Russia therefore forgive me for my, perhaps, poor English please:)

I'm very interested in meteor spectra observations but never did it and I don't know what to begin with. With pleasure read this forum and decided to buy this equipment:

Watec WAT-910HX camera + 6mm F0.95 lens + ThorLabs 830 l/mm 50x50mm transmission grating.

Please, prompt me, it's a good choice? The lens especially interests. The focal length and what it has to be is how important? Whether it is necessary to increase focal length? Or, perhaps, to leave focal length former but to increase grating lines number to 1200 l/mm?

In advance many thanks!
Clear sky! Smile
トップに戻る
ユーザーのプロフィールを表示  
Bill W



登録日: 2012.02.13
記事: 129
所在地: Glasgow

記事日時: Tue Nov 14, 2017 11:25 pm    記事の件名: 引用付きで返信

Hi,
For general imaging you'll get great results with the 6mm lens.
However for spectroscopy it is better to have a longer focal length as it gives a larger image scale.
You'll see all of my observations are done with 12mm lenses.
Using a higher line count gives greater dispersion but also fainter images.
600lines/mm or 830lines/mm give the best results with video type systems on average.
Of course you could catch a very bright meteor are get a fantastic spectrum with the high dispersion but they are not so common.
Hope this helps.
The other regulars might have different ideas though.
Cheers,
Bill.
トップに戻る
ユーザーのプロフィールを表示   投稿者のウェブサイトに移動
Skymagic



登録日: 2016.07.26
記事: 6

記事日時: Tue Nov 14, 2017 11:38 pm    記事の件名: 引用付きで返信

Dear Bill,

thank you very much for you reply! Unfortunately, I can have difficulties with acquisition of other lens, however I can increase focal length up to 8 mm. It is still not enough for receiving a good science spectra with 830/mm grating?
Whether the distance between graing and the lens matters? If yes, please prompt how to choose it correctly.
Thanks!
トップに戻る
ユーザーのプロフィールを表示  
前田



登録日: 2004.09.01
記事: 1577
所在地: Miyazai JAPAN (E131.4, N31.8)

記事日時: Wed Nov 15, 2017 10:48 pm    記事の件名: 引用付きで返信

Hi, Skymagic

Your equipments are good, I think.
The difference between 6mm lens and 8mm lens does not matter much.
And the difference between 600lines/mm or 830lines/mm dose not matter, too.
You should minimize the distance between graing and the lens.

Start your observation quickly, because it may take time a little to get a good spectrum.

Cheers,
Koji
トップに戻る
ユーザーのプロフィールを表示   投稿者のウェブサイトに移動
Skymagic



登録日: 2016.07.26
記事: 6

記事日時: Thu Nov 16, 2017 12:50 am    記事の件名: 引用付きで返信

Dear Koji,

many thanks for your answer!
In that case I will use my equipment and I will try to receive result. Unfortunately, now we have already very cold weather also have no opportunity to install the camera. I will try to make it in the spring, and I will study a theory until then and to calibrate my spectrograph. I hope nobody will be against if I will ask several аmateurish questions in process:)

Best regards,
トップに戻る
ユーザーのプロフィールを表示  
Bill W



登録日: 2012.02.13
記事: 129
所在地: Glasgow

記事日時: Fri Nov 24, 2017 10:36 am    記事の件名: 引用付きで返信

Hi Skymagic,

Koji is right, you will need patience as it takes time to catch those rare excellent spectra.
However with the cameras and lenses we have now it is easier than ever, even if you still need to wait a little while for success but you will succeed over time!
I live in one of wettest and cloudiest parts of Europe (and probably the world!) so if I can get good results so will you.
Make sure you post them here, I'm sure all the regulars would love to see your images and spectra.

Cheers,
Bill.
トップに戻る
ユーザーのプロフィールを表示   投稿者のウェブサイトに移動
特定期間内の記事を表示:   
新しいトピックを投稿   トピックに返信    SonotaCo.JP Forum Index -> UFOCapture BBS in English All times are GMT + 9 Hours
ページ移動 前へ  1, 2, 3 ... 12, 13, 14
Page 14 of 14

 
移動先:  
新規投稿: 不可
返信投稿: 不可
記事編集: 不可
記事削除: 不可
投票参加: 不可
このフォーラムで添付ファイルを投稿 できません
このフォーラムでファイルをダウンロード できます


Powered by phpBB © 2001, 2005 phpBB Group
Copyright ©2004 SonotaCo Network. All Rights Reserved.