Friday, August 4, 2017

Shooting an eclipse

I'm getting ready for the eclipse on August 21. I've used pinhole cameras made out of cardboard boxes with foil pinholes in the past. It is a good safe way to view and even photograph an eclipse without looking directly at the sun. This time around I decided I would like to try for some direct images. I have a Nikon D90 and a 70-300 lens so I started looking into how to make photos of the sun. I discovered this video on Youtube which shows how to manufacture your own lens filter. I purchased a small sheet of Black Polymer Filter and came up with the rig shown below.


The Polymer sheet is sandwiched between 2 cardboard rings and held in the end of the lens hood by friction.

The next problem I faced the first time I pointed the camera at the sun was "How do I aim the camera?" The sun is almost overhead which means I need to bend down awkwardly to look through the lens. I really should not be looking through a lens at the sun! I found an old flash foot guard - a little piece of plastic that slips over the contacts to protect them. I glued a small plastic L bracket to the guard and inserted a small bolt through the top of the L. I placed a small white card onto the vertical plain of the bracket as seen above. Now I can point the camera directly at the sun by reducing the bolt shadow on the card to nil.

The last problem I had was "How can I quickly look at the shots to judge exposure?" Even in the shade on a sunny day the LCD on the back of the D90 is very difficult to see and I don't really want to move the camera just to look at the images. It turns out Nikon has a neat piece of software called Camera Control Pro 2 that lets me work the shutter and settings from a laptop. The laptop screen is also difficult to see but I can sit in front of the laptop with a sheet over my head and the laptop. It looks old school but it works.

It was cloudy today but I had a clear sky for 15 minutes and after several test exposures I figured I was getting somewhere.


Shot with a Nikon D90, Sigma 70-300 F4, 2 seconds at F32.