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Filters for visual observations

文章發表於 : 2013-08-22, 11:28
willis
Much of my experiences are on imaging. After some reflections, I would like to do more on visual and enjoy and understand the sky more. I don't mean I would stop imaging, but squeeze time for visual. Anyway, after consulted some experienced visual observers and browsed Internet, the two most important visual filters are UHC & OIII. Any brands recommended?

Re: Filters for visual observations

文章發表於 : 2013-08-22, 12:02
社長
你手上有V4, P2,我也有Astronomik及Skywatcher UHC,你可以借去試試,到時交份報告便可以。

不過你手上那台Dob 12口徑會不會有點小? 現在Astrocafe的起步目視鏡是16"反射或8"APO折射 :lol:

抱歉,習慣了西藏的天空,Dob 16 GOTO看任何星系都有漩臂結構的,要求比較高些:

viewtopic.php?f=14&t=3078

Re: Filters for visual observations

文章發表於 : 2013-08-22, 13:24
willis
社長 寫:你手上有V4, P2,我也有Astronomik及Skywatcher UHC,你可以借去試試,到時交份報告便可以。



Can P2 & V4 be used for visual? I suppose they are for imaging. OK! Next time when I go to ur office, lend me ur UHC and let be try them.


社長 寫:不過你手上那台Dob 12口徑會不會有點小? 現在Astrocafe的起步目視鏡是16"反射或8"APO折射 :lol:

抱歉,習慣了西藏的天空,Dob 16 GOTO看任何星系都有漩臂結構的,要求比較高些:

viewtopic.php?f=14&t=3078


Maybe consider later. Too many automation, GOTO, may cripple my determination in understand the sky!

Re: Filters for visual observations

文章發表於 : 2013-08-22, 17:35
社長
willis 寫:
社長 寫:你手上有V4, P2,我也有Astronomik及Skywatcher UHC,你可以借去試試,到時交份報告便可以。



Can P2 & V4 be used for visual? I suppose they are for imaging. OK! Next time when I go to ur office, lend me ur UHC and let be try them.



why not.

當然若能夠在高質量天空,用大口徑測試會更理想,我剛數次去西藏也有帶足這4片濾鏡,只是每次都因為工作壓力,體力透支而放棄晚上再觀測。

willis 寫:
社長 寫:不過你手上那台Dob 12口徑會不會有點小? 現在Astrocafe的起步目視鏡是16"反射或8"APO折射 :lol:

抱歉,習慣了西藏的天空,Dob 16 GOTO看任何星系都有漩臂結構的,要求比較高些:

viewtopic.php?f=14&t=3078


Maybe consider later. Too many automation, GOTO, may cripple my determination in understand the sky!


在西藏,亮星及暗星分別並不明顯,沒有GOTO我找星很困難,連瞄輦道增七也瞄錯,這情況在台灣也不會出現。

Re: Filters for visual observations

文章發表於 : 2013-08-24, 22:44
Subaru
I tried the P2, V2, CLS and Celestron LPS visually. Except an occasion some 10+ years ago I tried the Celestron LPS using a C8 on M27 in Cheung Chau, I prefer no filter visually.

Moreover, I think these filters shall only come into play where there is sufficient aperture.

Re: Filters for visual observations

文章發表於 : 2013-08-24, 23:50
社長
我的體驗有些不同,在石澳一次聚會,203APO + Binoviewer + LPS filter,看M42效果遠勝集光力5倍的Obsession 18UC,那是當晚很出席愛好者,很一致的結論:

viewtopic.php?f=14&t=664#p6453

Re: Filters for visual observations

文章發表於 : 2013-08-25, 01:06
Subaru
社長 寫:我的體驗有些不同,在石澳一次聚會,203APO + Binoviewer + LPS filter,看M42效果遠勝集光力5倍的Obsession 18UC,那是當晚很出席愛好者,很一致的結論:

viewtopic.php?f=14&t=664#p6453

我相信社長那次是不同種類及setup的比較, 而我所測試的是同一支鏡同一個目鏡同一個目標, 加唔加光害濾鏡對於自己目視的感受.

Re: Filters for visual observations

文章發表於 : 2013-08-25, 10:00
社長
當然也有自身的比較,在203APO上,用了LPS濾鏡,星雲的細節及對比度明顯提升。

在18UC上也是,試過一次在西貢斬竹灣,天氣不理想,也要用上LPS濾鏡去看星系,那是無辦法中的辦法了:

viewtopic.php?f=14&t=362

我認為P2濾鏡的通用性比較高,因為相對於一般的V2、UHC、CLS濾鏡,後者是容許“有用”的星雲光譜通過,而P2則只拿掉有害的光害,所以P2的色彩表現較平衡,我只在很特別的情況下才用V4的:

viewtopic.php?f=17&t=442