出 ebay CaK solar filter

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發表於 2012-10-24 14:58 | 只看該作者

本帖最後由 bigdr 於 2012-10-24 15:00 編輯

請問 Baader filter係唔係指 Baader Planetarium AstroSolar™ Safety Film?

成個組合, 鏡前 Baader filter + 77mm blue filter > telescope > Barlow(Optional)> C-mount cell CaK filter > B/W CCD/CMOS?

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發表於 2012-10-24 15:08 | 只看該作者

本帖最後由 bigdr 於 2012-10-24 15:10 編輯

請問這種玩法
1. 望遠鏡焦距有無限? 用了Baader Safety再加Cak filter會唔會好暗？
2. C mount Cak filter 跟 CCD/CMOS中間的距離有無嚴格限制？
3. 無pressure tune，會唔會光暗偏埋一邊？

我有心買，不過未見過這種玩法，所以比較多問題。

等蛇

一流高手

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發表於 2012-10-24 15:18 | 只看該作者

Are you selling the eBay (Omega Optical) CaK filter (c-mount)TOGETHER with a 77mm blue filter? And the Baader filter is referring to the Baader white light solar film?

If so, please reserve for me.

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發表於 2012-10-24 18:00 | 只看該作者

請問 Baader filter係唔係指 Baader Planetarium AstroSolar™ Safety Film?

成個組合, 鏡前 Baader filte ...
bigdr 發表於 2012-10-24 14:58

Exactly.

http://osastrolog.blogspot.com

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發表於 2012-10-24 18:02 | 只看該作者

請問這種玩法
1. 望遠鏡焦距有無限? 用了Baader Safety再加Cak filter會唔會好暗？
2. C mount Cak filter ...
bigdr 發表於 2012-10-24 15:08

塊 filter 相當大, 所以無焦距限制

如果怕暗可用 Baader 3.8, 事實上我都係用 3.8, 5.0 亦夠光

http://osastrolog.blogspot.com

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發表於 2012-10-24 18:03 | 只看該作者

Are you selling the eBay (Omega Optical) CaK filter (c-mount)TOGETHER with a 77mm blue filter? And t ...
等蛇發表於 2012-10-24 15:18

All yes, but Baader solar white light is not included. Please confirm if you would still take it.

http://osastrolog.blogspot.com

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發表於 2012-10-24 18:04 | 只看該作者

bandwidth 較闊, 不用 tilt-shift/pressure tune

http://osastrolog.blogspot.com

等蛇

一流高手

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發表於 2012-10-24 20:58 | 只看該作者

All yes, but Baader solar white light is not included. Please confirm if you would still ta ...
oldfield 發表於 2012-10-24 18:03

Yes, I have go Baader solar film already. Please check PM for contact.

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發表於 2012-10-24 21:12 | 只看該作者

Reserved.

http://osastrolog.blogspot.com

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發表於 2012-10-24 23:59 | 只看該作者

請問如果想買新的, 在ebay可以用乜keyword search??
如果已經落了solar filter + Cak filter，點解仲要用77mm blue filter?

買唔到都想學下o野。

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發表於 2012-10-25 09:09 | 只看該作者

標準係用 Baader 5.0/3.8, 但如果推高 image scale, 用塊藍字已經掂

當然, 成個大前提係只拍攝, 而 CaK 目視亦不大意思

http://osastrolog.blogspot.com

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發表於 2012-10-25 09:40 | 只看該作者

THX,
我已經做了少少功課，不過都想問一問。再請教一下，這一塊係唔係都可以好似你塊CaK咁樣用？

http://www.ebay.com/itm/Optical- ... hash=item231cb7def6

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發表於 2012-10-25 10:37 | 只看該作者

Basically different, check this page:

http://www.considine.net/dgroski/halpha/

The similarity ends at a simple red (vs. blue) filter as ERF. In short, it would requires tele-centric/afocal lens pair and tilt-shift mounting.

http://osastrolog.blogspot.com

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發表於 2012-10-25 11:09 | 只看該作者

THX, 我就係見佢話係2塊matched filter, 仲要跟user provided mount，應該有麻煩o野要攪。
如果要攪tele-centric及tilt-shift mounting，都係唔o岩我這些懶人。