Photographing Solar Eclipses - Exposure Calculator
Author: Bill Kramer
Last update: Monday, 24-Dec-2018 20:59:03 EST

Exposure Estimations

Use Tab key to move field to field.

Sample lenses
Focal Length (mm)
Aperture (mm)
focal ratio

Imager type
Imaging area x mm
Imager array size Mpx
The imager input is used to compute the field of view and maximum exposure you can take without the need of a tracking mount. When film is selected the imager array size is ignored, pixel density not calculated, and an MTF sampling of 60 line pairs per millimeter is used instead.
Imager/Lens data
Apply Atmospheric Extinction
Average Humid Dry
Elev. (m)
Eclipse Alt (deg)

Atmospheric extinction is only applicable when the solar eclipse is low on the horizon (under 15 degrees).
The calculation used is based on a simplified model that does not account for all the variables that may exist. The output is merely a suggested starting point.

Input your lens and camera specifics at left,
results will appear below.

Object Exposure (seconds)
Partial ND5 filter
Diamond ring4
Corona 0.1 Rs
Corona 0.2 Rs
Corona 0.5 Rs
Corona 1.0 Rs
Corona 2.0 Rs
Corona 4.0 Rs
Field of view (degrees)
Tracking req.1
Air mass
Loss factor FeXIV2
Loss factor Hα3
Decimal time values

RS = Solar Radii

1No tracking mount exposure limit.
2 Applied to corona and diamond ring.
3 Applied to prominence, chromosphere, and partial exposures.
4 The amount of corona to show for the diamond ring effect is a matter of taste.


Is the photo type you were looking for not in the list? Or is there something that needs changed/updated/corrected? Send an email.

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