August 21, 2017 - Total Solar Eclipse in Driggs - dirwin
Landscape Eclipse composite

Landscape Eclipse composite

This is a composite of 9 images from the Solar Eclipse overlaid on a wide-angle landscape shot of the valley the the East of where we viewed it.

A standard eclipse composite employs a wideangle lens on a camera with a timer, and merges the orange sun/dark sky images with the single totality image in the center. This image is different, as I only have one camera which can use an intervalometer, and I chose to use it with my 600mm lens. So to make this image I:

- Start with a base 16mm wide-angle shot around 7:35pm and underexpose slightly.
- Use to find the azimuth and altitude of the Sun for the first and last shots of the sequence.
- Use to determine which mountain in the distance the sun was above at the time of the first and last shots in the sequence.
- Use formula for angle of view of my lens/sensor to determine roughly how much vertical space should be taken up by the sun's path, and roughly how high it was in the sky (ideally the sun would be shown covering 55% of the frame horizontally and 16% vertically).
- Place the first and last shots in sequence in their correct places.
- Place the totality shot in its correct place
- Place the 3 intermediate shots before and after totality in a reasonably consistent path.

Important notes about this image:
This image is a composite and is not an exact representation of a real scene. Specifically:
- The shadows on the field did not look like that during totality. The shadows in this image point the wrong direction. I kinda like it because it's eerie, and the minutes leading up to totality were also eerie. But it's not the right look.
- Despite my best effort/math, the Sun probably wasn't in these exact spots at these times.
- The Sun is shown enlarged approximately 15x larger than it would have actually appeard. This is done to show detail - Sun Spots are visible in a few of the exposures, and I think the flare at totality adds a bit of drama. But in reality, the Sun was much smaller to viewers who would have observed this scene.

Stats about this image:
Background: Canon 5D3, Canon 16-35mm f/4L IS lens at 16mm. ISO 640, f/8, 1/2000s. 7:35pm MDT, 8/21/17
Totality: Canon 5D3, Tamron 150-600mm lens at 600mm. ISO 640, f/8, 1/25s. 11:35:04am MDT
Eclipsed Sun: Same Tamron lens with a Spectrum Telescope thim film filter. Generally f/8 or f/9 at 1/100s. 10:36am, 10:55am, 11:15am, 11:30am, 11:40am, 11:56am, 12:17pm, 12:39pm