Table 17

Solar Eclipse Exposure Guide

        ____ISO____          _________________________f/Number_____________________________

            25               1.4      2      2.8      4     5.6     8     11     16     22
            50                2      2.8      4      5.6     8     11     16     22     32
           100               2.8      4      5.6      8     11     16     22     32     44
           200                4      5.6      8      11     16     22     32     44     64
           400               5.6      8      11      16     22     32     44     64     88
           800                8      11      16      22     32     44     64     88     128
          1600               11      16      22      32     44     64     88    128     176

_____Subject________   _Q_  ________________________Shutter Speed__________________________
     
Solar Eclipses                                                  
  Partial* - 4.0 ND    11      -      -      -    1/4000 1/2000 1/1000  1/500  1/250  1/125
  Partial* - 5.0 ND     8  1/4000  1/2000  1/1000  1/500  1/250  1/125   1/60   1/30   1/15
  Baily's Beads**      12      -      -      -      -    1/4000 1/2000 1/1000  1/500  1/250
  Chromosphere         11      -      -      -    1/4000 1/2000 1/1000  1/500  1/250  1/125
  Prominences           9      -   1/4000 1/2000  1/1000  1/500  1/250  1/125   1/60   1/30
  Corona - 0.1 Rs       7  1/2000  1/1000  1/500   1/250  1/125   1/60   1/30   1/15    1/8
  Corona - 0.2 Rs***    5   1/500   1/250  1/125    1/60   1/30   1/15    1/8    1/4    1/2
  Corona - 0.5 Rs       3   1/125    1/60   1/30    1/15    1/8    1/4    1/2  1 sec  2 sec
  Corona - 1.0 Rs       1    1/30    1/15    1/8     1/4    1/2  1 sec  2 sec  4 sec  8 sec
  Corona - 2.0 Rs       0    1/15     1/8    1/4     1/2  1 sec  2 sec  4 sec  8 sec 15 sec
  Corona - 4.0 Rs      -1     1/8     1/4    1/2   1 sec  2 sec  4 sec  8 sec 15 sec 30 sec
  Corona - 8.0 Rs      -3     1/2   1 sec  2 sec   4 sec  8 sec 15 sec  30 sec 1 min  2 min

Exposure Formula:     t = f**2 / (I x 2**Q)       where:   t = exposure time (sec)
                                                           f = focal ratio
                                                           I = ISO film speed
                                                           Q = brightness exponent

Abbreviations:     ND  =  Neutral Density Filter.
                   Rs  =  Solar Radii.


Notes:     * Exposures for partial phases are also good for annular eclipses.
          ** Baily's Beads are extremely bright and change rapidly.
         *** This exposure is also recommended for the 'Diamond Ring' effect.

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