Sky and Telescope - December 2016 - 69

PARTIAL
FILTERING
When shooting
the analemma
portion of the
project, cover
the top 2/3 of your
camera lens with a
strip of solar filter
material or dark
glass. This allows
you to properly
expose the Sun,
while still including foreground
objects that you'll
need when aligning each frame.
Otherwise, you'll
overexpose the
Sun while still
not revealing
many foreground
objects, as in the
frame at right.

Putting it All Together
Now that I had all the images, it was time to assemble
the parts. I performed the bulk of the work in Adobe
Photoshop 7. For the images acquired with the zoom lens,
I corrected for barrel distortion using a third-party plugin. The frames shot with the 17-mm fisheye had pincushion distortion, which I also tackled using the plug-in.
After the processing, the corrected images aligned
perfectly, thanks to the visible strip of foreground in
each image. I pasted each new layer over the previous
one and then used the Layer option changed to "Lighten"
to allow the Sun to appear in the darker sky. The result
then displayed a complete analemma in a dark sky. I
then flattened the layers into a single image while the
foreground over my apartment was no longer necessary
and thus discarded.
Once my analemma over Bursa was ready, it was
time to add the eclipse image from Antalya. I pasted the
Bursa analemma over the eclipse frame and carefully
registered it into the proper position. Finally there it was:
the first-ever "tutulemma," as I started calling it, with
the total solar eclipse as the crowning achievement.

Considerations for 2017
While my composite isn't quite the same as shooting
every frame on a single piece of film, it presented some
challenges that can be useful to others interested in
shooting their own.
The upcoming eclipse of August 21, 2017, will present
a better opportunity to capture a tutulemma of your own.
The path of totality passes over many towns and cities in
the United States, and if you're located at or near this path,

you'll have an easier time creating the final image. Key
to success is finding a suitable location without obstructions getting in the way of the Sun at the correct time of
day throughout the entire year, but based on the time of
day the eclipse will occur.
You'll also need a fi xed setup strong enough to be
left undisturbed for the duration of the project. Choose
a design to either position the camera permanently, or
one that allows you to remove and replace the camera
accurately. It's a good idea to scout out possible framing
compositions before constructing your setup. The analemma spans a large swath of the sky (47°) and requires
a wide-angle lens to fit comfortably in your frame with
an interesting foreground. This is especially important
for observers in the eastern half of the U.S., where the
eclipse occurs high in the sky and a super-wide-angle or
even fisheye lens may be required.
If you'll be traveling to the eclipse path, the position
of eclipsed Sun and the whole analemma will be angled
slightly differently with respect to the horizon than it is
in your sky at home. You'll need to calculate the offset
for your location outside the path. As long as you account
for these differences in your composition while pointing
your camera, it's relatively easy to composite the individual images together in Photoshop.
So if you're up for the challenge of shooting a tutulemma, it's best to start planning and shooting as soon
as possible - the earlier you start, the sooner you'll complete the analemma part of the project. Good luck! ✦
Tunç Tezel photographs nightscapes from some of the most
picturesque locations on Earth.
Sk yandTelescope.com December 2016

69


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Sky and Telescope - December 2016

Table of Contents for the Digital Edition of Sky and Telescope - December 2016

Contents
Sky and Telescope - December 2016 - Cover1
Sky and Telescope - December 2016 - Cover2
Sky and Telescope - December 2016 - 1
Sky and Telescope - December 2016 - Contents
Sky and Telescope - December 2016 - 3
Sky and Telescope - December 2016 - 4
Sky and Telescope - December 2016 - 5
Sky and Telescope - December 2016 - 6
Sky and Telescope - December 2016 - 7
Sky and Telescope - December 2016 - 8
Sky and Telescope - December 2016 - 9
Sky and Telescope - December 2016 - 10
Sky and Telescope - December 2016 - 11
Sky and Telescope - December 2016 - 12
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