Exposure Estimations

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Sample lenses
Focal Length (mm)
Aperture (mm)
focal ratio
ISO/ASA

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, the density not calculated, and an MTF of 60 line pairs/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.

Object Exposure (seconds)
Partial ND5 filter
Chromosphere
Prominences
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

1 No 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.

(c) June 2009 Version for operation inside a browser with Javascript by Bill Kramer as a special gift to the friends of: www.eclipse-chasers.com

Special thanks to Glenn H Schneider and Joseph Cali for lending their experience and expertise to the testing of this program.