Photographing partial solar eclipses usually isn’t that rewarding. A yellow disk covered partially with a black disk. Nothing to write home about. But today’s eclipse was different: a lone Sunspot (actually two, in region 2303) turned the Sun into a giant Pac-Man.
Not being rewarding doesn’t mean that it’s without any challenges, though. A special filter is needed to protect the lens, the sensor and – most importantly – the photographer’s eye. And the filter must be mounted in front of the lens.
The filter I have is a piece of thin metal foil mounted in an aluminum ring. It was made for my former 70-200/2.8 zoom some 7-8 years ago.
But I wanted to use my 500mm f/4 with a 2x teleconverter on a 7D Mark II today to make the Sun large on the image.
Somehow I had to mount the filter onto the much larger front ring of the 500. Cardboard and gaffer tape to the rescue! The adapter ring was completed in about 20 minutes and worked perfectly.
I lost about 4cm clear aperture this way, but that isn’t a problem when photographing the Sun. You still have plenty of light and contrast.
Another challenge was focusing. The turbulent air made it hard for the AF to catch the best focus. So I tethered the 7D Mark II to my 11″ MacBook Air and fired up Kuuvik Capture to do the focusing. And it was also a joy to watch the event unfolding on a notebook screen.
Note that I had been using a special build of Kuuvik Capture with 7D Mark II support – the currently selling one doesn’t support this camera. A privilege for being the developer of the app 🙂