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ASTRONOMICAL ADVENTURES

Eclipse Tours and More


UPCOMING

2017

OREGON
RIVER
CRUISE

USA Total Solar Eclipse
(2017 Aug. 12)
Details Here!


USA
TOTAL SOLAR
ECLIPSE

USA Total Solar Eclipse
(2017 Aug. 21)
Details Here!


->
Also See 2017
PREHISTORIC ENGLAND TOUR



PAST TOURS

Indonesia Total Solar Eclipse

Indonesia Solar Eclipse
Makassar Strait
[2016 Mar. 9]


Australia Total Solar Eclipse

Australia Solar Eclipse
Queensland, Kangaroo Isl.
and Adelaide
[2012 November]


Norway Northern Lights Cruise
to Above Arctic Circle
[2010 March 10–21]

China Total Solar Eclipse
2009 China Total
Solar Eclipse

[2009 July]




EXAMPLES
OF OTHER
PAST TOURS

(Links available for some but some links may not work correctly)

Caribbean Cruise Eclipse
[1998 Feb]
African Eclipse Safari
[2001 Jun]
Australia Outback
Solar Eclipse

[2002 Dec]
Transit of Venus
Italy, Athens & Crete

[2004 June]
Hybrid Solar Eclipse
Tahiti Cruise

[2005 April]
Astronomy, Archaeology
& Geology of Arizona

[2005 September]
Egypt Treasures &
Solar Eclipse

[2006 March]
China &
Solar Eclipse

[2009 July/Aug]
SOLAR ECLIPSE EXPOSURE GUIDE

Photographing the eclipsed Sun involves (1) image size, (2) exposure time and
(3) exposure times for no blurring without a clock drive. Here we consider Item #2.


WARNING: Do not observe or photograph the Sun out of eclipse or in partial eclipse without safe solar filters. (No filter needed for totally eclipsed Sun). See Eye Safety

Exposure times for photographing a solar eclipse are very approximate. Variable atmospheric transparency and variations in the brightness of total eclipse phenomena all contribute to this uncertainty. Actual densities of neutral density filters (ND) can differ. Use the ND filter for the uneclipsed Sun or the Sun in partial eclipse. (Note that not all photographic ND filters are safe for visual use.) Various solar eclipse photographers often prefer widely different values.

Use this table as a very general guide. Bracket very widely if you can, by at least two stops or much more. Finally, the longest exposures possible (especially for the corona) without using a clock drive are strongly conditioned by the focal length of the lens. (See Exposure Times for No Trailing).

A Very General Guide to Exposures
(Shutter speeds in seconds)
F/
Stop
Partial
Phases
(ND4)*
Diamond
Ring
Baily's
Beads
Promi-
nences
Inner
Corona
Middle
Corona
Outer
Corona
Land-
scape
Sky
ISO 100 Film
2 1/8000 1/4000 1/2000 1/250 1/125 1/30 1/15 2
2.8 1/4000 1/2000 1/8000 1/1000 1/125 1/60 1/15 1/8 4
4 1/2000 1/1000 1/4000 1/500 1/60 1/30 1/8 1/4 8
5.6 1/1000 1/500 1/2000 1/250 1/30 1/15 1/4 1/2 16
8 1/500 1/250 1/1000 1/125 1/15 1/8 1/2 1 32
11 1/250 1/125 1/500 1/60 1/8 1/4 1 2 64
16 1/125 1/60 1/250 1/30 1/4 1/2 2 4 128
ISO 400 Film
2 1/8000 1/1000 1/500 1/125 1/60 1/2
2.8 1/8000 1/4000 1/500 1/250 1/60 1/30 1
4 1/8000 1/4000 1/2000 1/250 1/125 1/30 1/15 2
5.6 1/4000 1/2000 1/8000 1/1000 1/125 1/60 1/15 1/8 4
8 1/2000 1/1000 1/4000 1/500 1/60 1/30 1/8 1/4 8
11 1/1000 1/500 1/2000 1/250 1/30 1/15 1/4 1/2 16
16 1/500 1/250 1/1000 1/125 1/16 1/8 1/2 1 32

For other ISO film speeds, use the values for ISO 100 and adjust by the appropriate factor.

Here are some examples.

ISO 50 Multiply all shutter speeds for ISO 100 by 2.
ISO 100   — Use shutter speeds as listed above for ISO 100.
ISO 200 Divide all shutter speeds for ISO 100 by 2.
ISO 400 Divide all shutter speeds for ISO 100 by 4 or use table above for ISO 400.
ISO 800 Divide all shutter speeds for ISO 100 by 8.
ISO 1000 Divide all shutter speeds for ISO 100 by 10.
ISO 1600 Divide all shutter speeds for ISO 100 by 16.


*ND mean neutral density filter. The filter must be specifically made for visual use so you can also safely look through the camera finder.

Warning. Typical ND photographic filters available in most photographic stores are not safe for viewing by the eye.

If an ND 5 filter is used, increase exposure by about 3 stops. An ND 4 filter has a transmission of 0.01% (0.0001). An ND 5 filter's transmission is 0.001% (0.00001) so an ND 5 filter transmits ten times less light than an ND 4 filter. Individual ND filters vary in density so make a test exposure roll before using.


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