DIY Solar Filter for Your Camera Lens

August 21, 2017 is a red letter day for much of North America including Kentucky. On that date we will enjoy a total eclipse of the sun. In fact, one ofthe best locations to view the eclipse is in Hopkinsville, KY, less than an hours drive from Bowling Green. Bowling Green will be located right on the northern edge of the eclipse path and will be able to see the totality, but a few miles south and west will provide much better viewing.

Some of you out there are probably wondering about how to photograph this event without damaging your camera or your eyes. There are a number of commercially available filters you can buy that attach to your camera lens that will do a nice job, but they tend to be rather expensive. So, I'm going to show you how to build a Do It Yourself version of a solar filter that works quite well. It cancels out 99.999% of the light along with all the UV and other bad light and allows for direct viewing and photographing of the sun.

First of all, this version was made to fit my 50mm - 500mm Sigma Lens. The concepts shown here can be used to build a filter for any size of lens, its just a matter of scaling down the size of the main tube that is used to fit your lens. Also, use only solar filter material that is designed for solar viewing. Do Not compromise on this, your eyes will not appreciate the cheaper materials and they can be damaged.

Here is the parts list:  1 - 4 inch Cardboard shipping tube...about $6.00. (Use tube size that will fit your lens)
                                 1 - 8x8 inch Black Polymer Solar Filter Sheet - about $18.00 (one sheet will make
                                       several filters) Amazon Link is attached to bottom of this article
                                 Some double stick tape
                                 A small piece of thin cardboard

Step One: Cut a 5 inch section off the end of the shipping tube. Use a Hacksaw to make a smooth cut.

Step Two: Remove the plastic end piece and cut out the center of the cap leaving about 1/4 inch all the way around the edge along the bottom. In this case just follow the ridge that outlines the center of the plastic cap. This creates the hole through which the filter material will be applied.

Step Three: From the 8x8 inch sheet of black polymer filter material cut a square section large enough to cover the end piece. In this case about a 4x4 inch piece worked just fine. While cutting the filter leave the filter material inside its cardboard holder and cut across/thru the cardboard. Do not try to remove the filter material and cut it separately as it is too flimsy and awkward to cut that way.

Step Four:  Take small strips of double stick tape and cover the bottom inside flat 1/4 inch wide portion of the end piece. After covering the end piece with tape, trim the tape so none of it extends over the cutout section. Tape should only be applied to the flat piece along the bottom.

Attach Polymer to bottom of the cut out plastic cap sealing along the double sided tape.

Make sure the Silver side is facing forward. The end result should look like this.

Step Five: Carefully place the Black Polymer material onto the back of the plastic cap. Be sure the shiny silver side is facing forward or looking thru the hole toward where the sun will be. The black side should end up on the inside of the tube. Gently, but firmly press the material onto the sticky tape and make sure it is sealed all the way around. It's okay if the material has some crinkled edges. It will not affect the performance. Try not to scratch the material though. Just make sure the entire bottom surface of the plastic cap is covered so that no light can penetrate through.

Step Six:  Gently press the plastic cap back into the cardboard tube.

  Step Seven: Depending on if the cardboard tube is larger in diameter than your lens, you may need to shim
                    up the inside of the tube for a tighter fit. To do so, simply cut another section of the tube, about                     3 or 4 inches is enough, then cut a 3/4 inch slice out of it. Pinch the ends together and slide into
                    filter tube. Additional shimming can be applied once the filter is slipped over the end of the lens.
                    Just use a 3 or 4 inch piece of thin cardboard folded over so it can slip into the gap between the
                    lens and the filter holder.

Additional piece of tubing with a small slice cut out of it, pinched together and then inserted into the maintube. This provides a bit of shimming to create a tighter seal around the lens.

Here is the finished product:

Notice the folded thin piece of cardboard wedged between the filter tube and the lens. This keeps the Filter tube tight so it does not wobble around or fall off.

...and here is the results. Now its just a matter of having clear skies for the eclipse and/or some interesting sunspots to appear.  Exposure on this one: Manually set f/8.0  1/500th sec  ISO 100  500mm (cropped).

Amazon Link for filter material:  https://www.amazon.com/Solar-Filter-Telescopes-Binoculars-Cameras/dp/B00DS7S52W/ref=sr_1_1?ie=UTF8&qid=1489027135&sr=8-1&keywords=mylar+solar+filter

The Photographer's View of the World

Yellow wild flowers, with a hint of mustard and green, spread like a blanket across the small pasture which
was surrounded by trees on three sides and wooden fence row along the road. Being late in the afternoon the low angle of the sun richoched off and through the flowers causing them to vibrate with a brillant flavor almost glowing from within. It was Kentucky at its best with warm spring temperatures and a clear sky filled with an ocean-like blue. I pulled well off the road and stepped and with camera in hand began to photograph this wonderful little patch of color from the edge of the fence. Within a few minutes I heard a voice from across the road shout, "Can I help you with something?" I turned to find a middle aged lady standing on her porch directly across from where I was standing. I thought maybe she might have owned this little pasture at first, but discovered later she was just a neighbor. Our conversation continued something like this.

"No, I'm just taking some pictures."

"What are you taking pictures of?"

"This little field here with all the yellow flowers."

"You mean all those weeds. Why would you want to take pictures of weeds for?"

I smiled and made one final comment, "I'll be moving along here in a moment. Sorry if I disturbed you."

This encounter was not the first time I had been asked what I was doing while I was taking pictures. Seems more and more I am confronted by people for no particular reason while photographing an interesting place. The interesting thing about this particular conversation was the different points of view the two of us had about the field. The person asking me saw only a field of weeds with no real value to it. I saw a magical moment of light filled with possibilities.

The Photographers view of the world is certainly different than the average persons view. Most anyone can stand on the edge of the Grand Canyon and marvel at the beauty, but photographers have an uncanny ability to see beauty in ordinary things like a field full of weeds. Not sure exactly where it comes from, the ability to see beauty in ordinary things, but I suspect the initial stirring to life that feeling of 'something wonderful is here' must first come from the heart where our creative instincts seem to reside.

As an artist who uses the camera to capture a vision, I've grown accustomed to looking for what others do not always see. Often times, I'll see it well before I can capture it, but what I am actually seeing is not always how I want to capture it. The camera gives us the ability to translate light into the form we desire. Like an artist, the ability to do such things become instinctive, you just see it first in your heart and then in your mind as the form of the composition begins to take shape. Understanding how the camera captures light is an important technical element to have not unlike a painter knowing how to use the brushes and pigments of his craft. It comes with practice.

To view the world as a photographer requires one to see the world from the perspective of light as opposed to an object. Objects can distract us from the real potential of the moment. Looking beyond the object and seeing how it may appear when bathed in golden light elevates the photographer toward viewing the world as an artist would see it. When doing so, even a field full of weeds becomes a magical moment of light.