可能遲咗d , 請問各位知唔知邊度有日蝕用濾鏡賣
睇以下網頁講 , 好似要 density 4.0 , 即係減低 10,000 倍嗰d先得

http://www.wavelengthphotography ... asp#Solar%20Filters


Thanks

For your reference, take the 5.0 type:
http://www.tan14.com/gears.htm

Use 5.0 type filter. At ISO100, a correct exposure of sun could be obtained at F8, 1/1000 or 1/500 second. I just tested it yesterday. Don't view the sun with with filter with density under 5.0. It may cause permanent eye damage.

If this will be your first ever photo of the sun, better get an experienced guy to coach you. You may also find some activities in local astronomy clubs such as this
http://www.hkastroforum.net/index.php

[ 本帖最後由 passerby-b 於 2009-7-13 19:24 編輯 ]

offtopic: WenXP 的 AKOW 提及的 Astro-physics topic s很精彩 !!

對天文有趣的不容錯過!

吾睇都吾知，原來拍日蝕o既 4.0 filter，同普通攝影用o既 -4 ND filter 差好遠！

咁想請問, 如果ND400 夠唔夠 ? 減左光但防唔到紫外線對個 CCD / CMOS 有冇影响 ?
Thanks !

I'm not so sure about the ND filter method, in the old time it's ND400 plus ND4 for solar imaging(if I remember correctly), but for the all round safety sake still suggest to use the baader filter-despit it's not a long last product.