Table 23. 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 (s)
-------------------     -----    ------------------------------------------------------------------------
Solar Eclipse
  Partial[1] - 4.0 ND    11         -       -       -    1/4000   1/2000   1/1000   1/500   1/250   1/125
  Partial[1] - 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[2]       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[3]      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       2 
  Corona - 1.0 Rs         1      1/30    1/15    1/8     1/4      1/2      1        2       4       8 
  Corona - 2.0 Rs         0      1/15    1/8     1/4     1/2      1        2        4       8      15    
  Corona - 4.0 Rs        -1      1/8     1/4     1/2     1        2        4        8      15      30    
  Corona - 8.0 Rs        -3      1/2     1       2       4        8       15       30      60      120

Exposure formula:

  t = f 2/(I x 2Q),

where:

t= exposure time (s)
f= f/number or focal ratio
I= ISO film speed
Q= brightness exponent

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

Notes:

[1] Exposures for partial phases are also good for annular eclipses.
[2] Baily's Beads are extremely bright and change rapidly.
[3] This exposure also recommended for the 'Diamond Ring' effect.


F. Espenak - 2001
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