How to block excessive light in daylight?

Yesterday I learned I need something to block excessive light for long hours of time lapse photo. The ideal setting for time lapse photo for a day is to use one aperture, shutter speed, and ISO number.

ND (Neutral Density) filter.

http://www.tiffen.com/tips_ndfilters.html

Neutral Density filters reduce the amount of light passing through the camera lens without changing the color of the scene.
·         Especially useful in bright light conditions to help prevent overexposure and achieve a balanced exposure.
·         Allows specified exposure when desiring to expose at large apertures despite being present in bright lighting conditions, which normally require small shooting apertures.
·         Neutral Density filters allow aperture control for selective depth of field shooting.
·         Most popular Neutral Density filters are ND 0.3, 0.6, & 0.9. (ND 0.6 is most popular.)
·         These above filters hold back 1, 2, & 3 f:stops of light respectively.
·         The above-mentioned ND filters are also referred to as 2X (ND 0.3 -1 f:stop), 4X (ND 0.6 – 2 f:stops) and 8X (ND 0.9 – 3 f:stops)
ND FILTER                         % LIGHT TRANSMISSION                     f:stop REDUCTION
            0.1                                               80                                                    1/2
            0.2                                               63                                                    3/4
            0.3                                               50                                                    1
            04                                                40                                                    1 1/4
            0.5                                               32                                                    1 ¾
            0.6                                               25                                                    2
            0.7                                               20                                                    2 1/4
            0.8                                               16                                                    2 3/4
            0.9                                               13                                                    3
            1.0                                               10                                                    3 1/4
            1.2                                               6.3                                                   3 3/4
            1.5                                               3.2                                                   4 1/4
·         Neutral Density filters are available in Color Grad Neutral Density filters consisting of half dear glass graduated to half neutral density. This allows for a smooth blending of the scene and proper balanced exposure in uneven lighting situations.
·         Color Grad Neutral Density filters are available in ND 0.3 (1), ND 0.6 (2), and ND 0.9 (3). You must specify graduated effects in “Hard Edge” or “Soft Edge” and “Horizontal” or “Vertical” format.

 

To know about ND filter in detail, check this article. It explains the effect of various ND filters with real photo images.

About janpenguin

Email: janpenguin [at] riseup [dot] net Every content on the blog is made by Free and Open Source Software in GNU/Linux.
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