Solar Film

[funoooo]

Tan14 有兩種 density 3.8 及 5.0. 有什麼分別？

[Wah!!]

99% 時候, 只需考慮 5.0
3.8 一般用途都太光.

[willis]

5.0 for visual
3.8 for photography (shorten the exposure time, reduce the shaking during high magnification)

[CHYeung]

The density 3.8 film is only suitable for high magnification imaging. In my experience, the exposure time is about 1/1000 second at f/20, ISO 100 for the density 3.8 film.

I used the density 5.0 film for last year's solar eclipse, correct exposure during the partial phase is in the range of 1/250 to 1/500 second at ~f/12, ISO setting 200.