My friend Jamie and I recently reminisced about my first trip to Utah 15 years ago this month, so I took a look at the trip report, which I rewrote and expanded a few years ago. One thing I noted was how great my travel camera at the time, the Minolta DiMage 7i, did, particularly with its beautiful color rendition and spectacular 14-point sunstars.
Add to that the arrival of the holidays, and it’s a perfect time to revisit sunstars, an excellent tool in our photographic toolbox.
I talked about sunstars a time or two before. They are created by lenses as rays extending outward from bright points of light, and help us express a feeling of brightness and brilliance in a scene. Most lenses produce some kind of sunstars, but some lenses produce better ones than others.
The formula for sunstars is pretty basic: if your lens has even-numbered aperture blades, it will produce that number of sunstar rays (six-bladed apertures make six-pointed sunstars.) If you lens has an odd number of aperture blades, your lens should produce twice that number of sunstar rays (seven-bladed apertures make 14-point sunstars.)
That’s the formula, anyway. In practice, it doesn’t always work our quite that way, and in testing today, I had a couple of surprises.
I grabbed some of my lenses I thought would be good sunstar producers and took them out to our Shumard oak tree. With clear skies and brilliant autumn sunshine, I know I would coax most of them into nice-looking sunstars. Most of these lenses are older AF Nikkor lenses with straight seven-blades apertures.
It wasn’t so much a controlled test or a lens shootout, as much as it was me getting a better feel for which lenses I currently own can produce sunstars and to what degree.
All these test images were shot at f/16, a very small aperture, since larger apertures don’t really produce sunstars.
The lack of real aperture blades is also why smartphones produce sunblobs instead of sunstars.
It was fun to run in and out of the house with a different lens each time. Hopefully I have conveyed the power of the this effect, one of my favorites.