How to Create Sunstars in your Photos
How to Create SunStars in your Photos
I love a sharp sunstar whether sunrise, middle of the day or evening lights. They ad a sparkle, literally, to that picture.
The starburst is caused by light passing through a small aperture (this is a high number between f/16-f/22). The narrow opening causes the light to be diffracted or spread out across the aperture blades in the lens in a uniform manner as it is recorded by the camera sensor. The more blades and the less curved they are, the better the star.
There are also a few factors in the environment which will increase your chances of a sharp sunstar.
Camera Setup & Composition
To capture a sunstar, simply adjust your aperture to f/16 and shoot facing the sun.
Be careful to not point directly at the sun through the viewfinder, especially when it is high in the sky as you are basically focusing the sun directly into your eye. Use the Live View screen to save your eyes if shooting directly into the sun.
Sharper stars will appear if you manage the light source by having it peak out from a hard edge surface.
SunStar Camera Settings
A f/16 aperture and letting the sun peak around a hard edge works the majority of the time.
Here are some suggestions if you are not getting the desired sunstar.
I take a shot and then look in the preview to check the sharpness & flare and also the histogram. Remember you are dealing with refracted light.
Flare: Sometime a small adjustment up/down or left/right in the position of the camera will sharpen the light.
Exposure: With the sun in play, you need to keep an eye on exposure and on first shot may end up with a pure white photo. A good starting point for sunstars is to underexpose your image by two complete stops.
Check the histogram. Generally speaking, unless an image is intended to show bright white or pure black areas, pixels pushed up to the very edge of the histogram could indicate an exposure problem. The sun should also appear white and not grey.
If the histogram is not touching the edges, you can use a software editing program like Lightroom or Photoshop to recover the darker sections of your image.
I was introduced to star filters when at a Lantern Festival.
Star Filters are etched with a criss-cross pattern and designed to intentionally defract the light and create a star effect. The star filters come in all common lens thread sizes & vary in design to product star effects with 2 to 16 points. There are over 800 variations on the market to inspire your creativity.
They make for a quick and easy way to manage light sources, especially in tricky lighting like a lantern festival.
Processing the Photo
Your photo on the viewfinder will still often look darker and the sunstar not as sharp.
This is where Lightroom will reveal your photo.
In lightroom, play around with the white, highlights, and shadows to further adjust the light and sharpness of the star.
Inspired to create Sunstar Photography?
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