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Sunday, November 25, 2012

Total Solar Eclipse Photography

I recently had the fantastic experience of being able to view and photograph a Total Solar Eclipse. The November 2012 Eclipse from Port Douglas in Australia.

A little bit of basic info:

A Solar Eclipse is when moon passes between the Sun and Earth casting a shadow on a part of Earth. This shadow follows a path from usually from west to east because from the observer's perspective the Sun is moving faster than the moon. The Shadow is moving at thousands of kilometers per hour across the surface of the earth. It takes approximately 2 hours for the shadow to pass completely over a single fixed location on Earth.

Earth's orbit of the Sun and the Moon's orbit of the earth are not a perfect circle rather they are elliptical (oval shaped) enough so that the apparent sizes of both the Moon and the Sun change. Sometimes the Moon is closer to Earth appearing slightly larger and able to completely cover the the Sun (a Total Solar Eclipse) sometimes the moon is further away and appears smaller than the Sun and does not completely cover the Sun leaving a bright ring. This is an Annular Solar Eclipse.

OK - So what about getting a photo?

The key is to plan well.

The Nov 2012 Total Solar Eclipse was going to take 2 hours from start to finish.

I was hoping to get 5 key shots.
  • First Contact: - The moment just after the moon appears to enter into the sun. 5:44am
  • About half obscure when the moon covers about 50% of the sun. Approx. 6:15am
  • Second Contact: - This at the moment just before Totality when the edge of the sun shines through the edge of the moon. This creates a phenomena called Bailey's Beads or the Diamond Necklace. 6:36am
  • Totality: - The point the Moon totally obscures the Sun. From 6:37am to 6:39am
  • Third Contact: The moment the Sun begins to appear from the other side of the Moon. This creates a similar image to Second Contact. 6:39am
The NASA eclipse website was my starting point. There you can get a schedule of the up and coming events complete with dates, times, locations and maps.

From there I planned a trip to Port Douglas where a work colleague has a unit (condo). Port Douglas was closer to the center line of the path of the shadow and therefore Totality would last longer (2 mins).

One of my big surprises was how popular a Total Eclipse is, according to the local media over 60,000 people came to see this one. This is 4 mile beach at Port Douglas - It is never this popular at 5:45am.

Four Mile Beach Port Douglas

So Tip 1. - Plan ahead.

Next was to think about the gear to take:

I took my Canon 1D-X - its my only body so no debate there. I will say that if you have 2 bodies take them both. There are some interesting shots in the eerie lighting during totality and wider focal lengths. So one on the tripod and one on your shoulder.

The lens I used was a Canon 100-400mm F4.5-5.6 L IS lens. I used it with a 2x Extender III. I used to have a Canon 7D which has a crop sensor (1.6x crop factor) This makes the 400mm focal length on the 7D the same as having a 640mm lens on the full frame 1D-X. To increase the focal length of the 100-400mm lens the 2x Extender gets me to 800mm.

This makes a tripod essential kit for eclipse photography.

Tip 2. Take a tripod.

You also need a filter. I had two but ended up only using one. I have a 77mm circular Black Polymer filter from Thousand Oaks which I didn't use. Instead I use a home made filter using some BAADER AstroSolar Film this should be available from your local telescope supplier. It was interesting to me that traditional camera stores don't carry solar filters. A word of caution. Originally I used this film for the transit of venus earlier this year and made the mistake of taping the film to a clear Cokin filter so I could use my P Series Cokin filter kit. Bad Idea! The film and the filter reflect on each other and you get a double or ghosted image. (See pic below) So this time I made a filter using cardboard tubing and made a cap that fits over the lens. The reason this system works better than the 77mm threaded filter is that during totality you need to remove the filter and shoot with no filter. A threaded filter will take more time and you might lose the shot.

The Black Polymer filter gives the sun a very yellow look while the AstroSolar film give the sun a pinkish to white look.

June 2012 Transit of Venus - The ghosting is from using AstroSolar film over a clear filter. A lesson learned the hard way. 

Tip 3. Get a solar filter and test it before hand.

Planning done, gear packed, tickets booked, alarm set, location scoped - all set.

We were staying 2 mins walk from the location I planned to use. I arrived at about 5:10am before sunrise. Already people were gathering but our part of the beach still had plenty of space.

During the eclipse the lighting was going to change dramatically - I'm using a tripod with a lens that has image stabilisation so it needs to be turned off. (Using IS with a tripod has the opposite effect of moving the image during the time the IS is becoming active.) I chose to use shutter priority (tv) and set the shutter at 1/250th - I would have liked to be faster but with the changing light I would have been under exposed in the darker moments.

The 1D-X allows you to set a maximum ISO and although it is a very capable low light camera I prefer not to let the ISO go over 6400. - Check.

During the eclipse I am continually altering the exposure from under exposed 3 stops to over exposed 3 stops.

The biggest unknown and uncertainty during the shoot is clouds but I knew from my venus transit shots that this might actually give the shot some extra character - which ended up being true.

To top it off - providentially - we had no cloud right at the time of totality and got some great shots.

During Totality the filter comes off and you can shoot without risk of damage to eyes or sensor. I was shooting at f11, ISO 3200 & 1/250th -3 ev

Totality is an amazing event without a camera. You can see the stars and there is this eerie silence, your brain is sending messages that something is weird. If possible everyone should try to experience at least one Total Solar Eclipse in a lifetime. The group next to us had flown in from the USA for this event and obviously didn't share my Christian beliefs, their reaction was to express a desire to sacrifice a chicken. Well thankfully our feathered egg laying friends survived at least until Col. Sanders caught up with them.

The second half of the eclipse was mostly clouded over so I packed up fully satisfied with the results.

So how did they turn out?

Check out the results at this link. vitamirus.me/Eclipse

Here's my favorite.

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