Preparing to Photograph the 21 August 2017 Solar Eclipse? Practice, Practice, Practice

If you’re going to try to photograph the solar eclipse on 21 August, practice what you want to try out. Totality will last less than three minutes at best. You just have one shot.

I’ve been practicing and preparing for Monday’s solar eclipse by going over my equipment, trying photographic methods, and thinking what it is I’m really trying to do in seeing this event.

First and foremost, I want to experience the eclipse, not spend those few precious minutes fiddling with gear only to realize later that I missed the whole show. That means planning what I will and will not do, in detail.

I’m planning on setting up one camera on a tripod to take a series of wide angle shots that can be stacked afterward to make a composite image. This must be set up with a solar filter that can be popped off at the beginning of totality and then on again at the end. The good thing is that with that camera running on its own intervalometer it’s pretty much a hands off process.

A practice run of solar images captured with a dSLR running on internal intervalometer with a brown plastic solar filter. The sun covers its own diameter in the sky in about 2 minutes. This image is cropped from a larger composite lasting a fee hours. It represents about 50 minutes of the sun’s movement through the sky.

My most complex set-up will be a 125 mm Maksutov-Cassegrain telescope equipped with a mylar solar filter, set up on my old black EQ4 mount for viewing, twinned with a dSLR with 500 mm telephoto lens for detailed coronal photos at totality. I’ve been working out the basic details of exposure times this week.

A telescope equipped with a mylar solar filter twinned with a dSLR camera and a 150-500 mm telephoto lens, also behind a mylar filter. This setup will not follow the sun with accuracy: it will have to be corrected manually throughout the eclipse.

I’ll also have a video camera set on wide angle to record the overall setting. My fourth camera will be a “general purpose” dSLR to take photos of the event and my colleagues as it unfolds.

The main thing is to be able to set things up efficiently and then paying attention to the timing of the event. One key manipulation is to pop solar filters off of cameras during totality. I’m creating a checklist to keep my intended processes working minute by minute, with time built in to take the whole thing in.

Practice, practice, practice!

The Eclipse of 2017: One Week To Go!

Will the total solar eclipse of 21 August 2017, which will transit across the continental USA, live up to the hype? The eclipse will also be visible as a partial eclipse from pretty much all of Canada and Mexico.

I've already seen that some writers are expecting the eclipse to be the most-photographed event in history (at least far). I'm planning on seeing the eclipse first hand, as are many other astronomy fans and photographers. My contacts near our planned main observing site are worrying about the traffic. Stores specializing in astronomy gear are selling out of excise viewers.

Whether or not the event – compounded by human interest – lives up to it all depends on the weather too. Right now I'm hopeful it will cooperate. Long-range forecasts (always to be taken with a grain of salt) show a sunny day expected on the 21st at my planned observing site. Just in case, though, I do have a backup site thanks to the suggestions of friends in the area.

In the mean time, many people planning on attending the eclipse in its totality are practicing their photographic methods. I've been preparing by running a series of tests of interval exposures with wide-angle lenses. Shot through solar filters, these photos are then stacked together to create a single image showing the track of the sun through the sky.

Above, a Nikon D800 dSLR on a sturdy tripod with a wide angle lens and a solar filter, set up to take photos every 30 seconds. The sun moves through the sky at a rate of about 15 degrees per hour. At a diameter of about 30 arc-minutes this means that the sun shifts by its own diameter every two minutes.

I've also been running through other equipment options, such as whether I should try to set up a telescope and motorized mount to follow the sun. Given the travel distance and the practicalities of carting around heavy gear, I'm now planning to minimize the kit and maximize the experience, but also be equipped to take some interesting snaps.

On to more mundane things today though, like having a plumber over this morning to replace some old plastic water lines that are now prone to leak.

Getting Ready for the Eclipse? Free Viewers in SkyNews!

Kudos to SkyNews, Canada's astronomy magazine! In specially-marked copies of the current issue (on shelves right now) they're giving away free eclipse viewing glasses. Look for the yellow sticker on the top right of the cover for a copy with the insert. Eclipse viewers are hard to find already. Even KW Telescope on Manitou Drive in Kitchener have told me they've sold out and are expecting more shortly.

You should be able to find SkyNews in Chapters, Indigo, and other shops with large magazine racks – until they sell out too!

Also, there's a photo of mine on page 14 🙂 (the Nov 2016 moonrise sequence).

The Great Eclipse of 2017 is Just Around the Corner!

One of the grandest spectacles in astronomy is a total solar eclipse. On 21 August 2017 there’s going to be a stunning event, as the shadow of the moon sweeps over the continental USA from west to east. I’ve recently seen suggestions that this might be the most photographed event in history (to date) when it happens. I’ll be in there too, dear readers, making plans for many months about the chance to photograph this spectacle. The next one that will be visible over the North American continent will take place on 8 April 2014.

eclipse book cover

Alan Dyer’s ebook on the 21 August 2017 eclipse is highly recommended. You can get your own copy here: http://www.amazingsky.com/eclipsebook.html 

A total solar eclipse is, of course, a transient event in which the moon passes directly in front of the sun from the perspective of some location on earth. Because of the coincidence of the similar relative sizes of the sun and moon as viewed from earth, the moon can just about block out the central disk of the sun. A total eclipse, as the name suggests, brings the sun, moon, and earth into alignment. A partial solar eclipse consists of part of the sun’s disk being blocked.

The 21 August event will be a partial solar eclipse in southern Ontario. For observers in a band a few kilometers across running from the west to the east coast of the USA it will be total.

Preparation for watching an eclipse is a must. Not only should anyone wanting to take this in be prepared from the perspective of observation itself, safety is a crucial concern. Although the disk of the sun is blocked by the moon during these events, the sun is still producing a great deal of UV radiation from the corona, the tenuous outer layers of the sun’s atmosphere. Always wear appropriate eye protection during these events, or observe indirectly, such as with a pinhole camera you make make from a simple cardboard box. For safe eclipse observing ideas, see: https://www.space.com/35555-total-solar-eclipse-safety-tips.html

In preparation I’ve been sorting out gear, trying things, and reading up. I highly recommend Alan Dyer’s comprehensive e-book on photography of this specific event. I’m planning on using several cameras to capture different aspects of the eclipse. At least one will be running interval photos that can later be stacked to produce this sort of effect:

Solar Practice 2017

A three hour sequence of solar photographs taken at the home base of the Pine River Observatory, at Lurgan Beach, Ontario on 29 August 2017. A Nikon D7000 digital camera was set up to take photos every 30 seconds, and was equipped with a Mylar solar filter and a wide-angle lens. Every sixth resulting photo was then stacked with StarStaX. The last photo, with the sun in the trees, was taken without the solar filter. It forms a background for the otherwise rather dull individual photos of the sun.

Another camera will be set up with a long telephoto lens and a Mylar solar filter. I am not quite sure yet whether or not I will set up any camera on a telescope mount to track the sun – as this trip requires some travel, lugging such things around is always complicated.

If you are able to take images of the eclipse, consider submitting them to SkyNews Magazine, Canada’s own astronomy magazine. They’re holding a contest for the best solar eclipse photo: http://www.skynews.ca/solareclipsecontest/ 

Safe observing!

Copyright 2017 David Galbraith

 

Happy Perihelion for 2014!

While we make a big deal of the two annual equinox and solstice events, most people don’t realize that there’s a point when the earth is closer to the sun than at any other time during the year (perihelion) or as far away as we can get from our local star (aphelion, pronounced “ap-helion,” not “afeelion”). Perihelion is always in the first few days of January in our current epoch; aphelion comes in early July.

The earth’s orbit is an ellipse, with the sun sitting on one of the two foci of that ellipse. Because it’s not exactly a circle, there are times during the year when the earth is a little closer or a little further away from the sun than average – about 3% closer. According to the web site In The Sky (http://in-the-sky.org) the earth was at perihelion at 06:59 EST, Saturday 4 January 2014. This was just before sunrise this morning (which took place at 7:52 AM EST here in Hamilton).

I went out to take a photo of the sun on the morning of perihelion 2014. I hadn’t been following the news, and so was pleasantly surprised to spot the big sunspot on the visible disk (AR 1944) in the camera view-finder.

sun

The sun, photographed 4 January 2014. See below for details.

The photo of the sun above was taken from the LaSalle Marina in Burlington, Ontario at 10 AM EST, 4 January 2014, three hours after perihelion. The large sunspot in the lower left has been designated AR 1944 and is one of the largest this cycle. Taken with a 150-500 mm Sigma telephoto zoom lens and 1.4x teleconverter on a Nikon D7000 body; solar filter was an Orion mylar filter for white light. Conditions were not ideal – a great deal of wind, quite cold, and high, diffuse clouds.

Copyright © 2014 David Allan Galbraith

Free Solar Observing Today at Royal Botanical Gardens

We’re going to hold Royal Botanical Gardens’ third “Solar Thursday” today (29 August 2013) from 12 noon to 1 PM, on the lawn area in front of the main visitor entrance to RBG Centre. Everyone’s welcome to join us for a view of the sun through special, safe telescopes.

If you have a solar telescope you are very welcome to join us in presenting the amazing spectacle of the sun to the public. We like to be “open for business” at 12 noon, so coming a little earlier to set up would be helpful. We have electrical power available if your telescope needs it. We start packing things up around 1 PM. RBG is located at 680 Plains Road West, Burlington, Ontario.

We will be looking through specially-equipped telescopes that filter the bright light from the sun. These filters make it safe to observe the sun’s surface. Remember:

No one should ever look directly at the sun without special, appropriate equipment. Permanent eye damage or blindness may result from inappropriate attempts to see the Sun, or the use of incorrect equipment. We will be using telescopes designed specifically for solar observation, or those equipped with filters specifically made for this purpose.

Once you’re familiar with the equipment and have things in focus, you will be able to take in the sights in just a few minutes! Some nice sunspots are visible today.

Katie

Visitors to Royal Botanical Gardens, 680 Plains Road West, Burlington, Ontario enjoying views of the sun live during RBG’s second “Solar Thursday” event, 15 August 2013.

Copyright © 2013 David Allan Galbraith

Enchanted by the Sun

This summer I’ve been delving into solar studies. Perhaps it’s like the proverbial goldfish not noticing the water that surrounds him, but I really hadn’t paid much attention to our nearest star. Last year I did start to take my own look at the sun, using solar filters on an old 80mm f15 refractor, and that was pretty interesting. Somehow the solar bug has really bit me this year.

I’ve added some equipment to Pine River Observatory this year, and that’s helped. In addition to my Meade ETX 125 Terabeam telescope, which I now have equipped with both a Kendrick Astro Mylar solar filter and a Baader Planetarium continuum filter, I picked up a Coronado 60 mm Solar Max II BF15 Hydrogen alpha telescope a couple of months ago. The upshot of all of that is that I can take a look – and am starting to photograph – the sun at two quite different wavelengths, corresponding to different structures on its surface.

There’s an interesting feedback loop here. As I’ve been able to see the sun for myself, and consider how to take photos, and even explain what can be seen through a telescope to others taking a look, I’ve found that my curiosity has risen. I’ve been reading more, seeking out a deeper understanding of what I’m seeing. That in turn has made my observations a little better, I think, and certainly has meant I’m doing a better job of interpreting for others.

It’s also been exciting to see that there’s a lot happening in terms of science and solar observation right now. Consider these three news items from the past month alone:

  • A new ground-based solar telescope (the New Solar Telescope or NST) at the Big Bear Observatory in California has just started to produce incredible images of the photosphere and sunspots – with a resolving power that approaches 30 miles on the sun’s surface (http://www.bbso.njit.edu/)
  • A new solar observatory satellite, Interface Region Imaging Spectrograph (IRIS) achieved “first light” in July, and is already transmitting wonderful images back to earth (http://iris.lmsal.com/)
  • NASA has updated information available on the progress of the present solar maximum. This event, every 11 years or so, is marked by a peak in sunspot numbers, and represents a reversal in the orientation of the sun’s magnetic field. The present solar maximum was anticipated for 20111 but it’s a little late. The magnetic flip is anticipated between now and November.

These are just examples of the activity around solar observations in the past little while. The more I’ve read, too, the more I want to find out. The sun is quite addictive! More postings to come.

sun aug 2013

The sun’s “surface,” or photosphere, photographed from Burlington, Ontario’s LaSalle Park Marina on the morning of Monday 5 August 2013. This image was captured using a Meade ETX 125 TB telescope equipped with a Kendrick Astro Mylar solar filter and a Baader Planetarium continuum filter. These filters produce a green image that highlights contrast around sunspots and solar granulations. The image is a mosaic of two shots taken with a Nikon D5100 at prime focus, as the image produced by the telescope is larger than the D5100’s APS-C-sized sensor. The image was processed with Paint.net, a free image processing program. Although we might think of the sun as a big ball of hot gas it’s structure is much more remarkable than that. At its core the density is enormous – a liter of the gasses would weight 150 kg. At the surface we can see, as in this photo, the density is less than 1% of that of our own atmosphere at ground level.

 

Copyright © 2013 David Allan Galbraith