PDA

View Full Version : Distracting lighting?



EAP
03-30-2005, 04:28 PM
The night shot below is one of several I took of the same landscape, and they all came out with the halo effect -- almost a star effect in some cases -- around the brightest lights. I feel this distracts from the overall photo. What is this called and how do you decrease or eliminate it? I was shooting with a Canon A95, at ISO 50, on manual at F8 for 4 seconds.

http://bethsadventurepics.smugmug.com/photos/18331732-M.jpg

John_Reed
03-30-2005, 04:47 PM
The night shot below is one of several I took of the same landscape, and they all came out with the halo effect -- almost a star effect in some cases -- around the brightest lights. I feel this distracts from the overall photo. What is this called and how do you decrease or eliminate it? I was shooting with a Canon A95, at ISO 50, on manual at F8 for 4 seconds.

http://bethsadventurepics.smugmug.com/photos/18331732-M.jpg"Blooming" comes to mind. You're basically set up to shoot a very dark scene, with your shutter open for 4 seconds. Most of the scene is well enough exposed to show you building outlines, the Needle (is that it?), etc., but then you have these light sources. In order to expose them properly, you'd have to speed up the shutter quite a bit. So, wanting the exposure on the darker stuff to come out right, you let those light sources have their way wherever they enter the scene, which will cause WAY blown-out highlights, or "Blooming," in those particular areas. I think the star-shaped patterns are an example of "Bokeh," i.e., the pattern cast by out of focus light circles on your image sensor. And their shape has to do with the number of blades in your lens diaphragm, which must be 6 in this case. I'm not sure what you could do to overcome it and minimize those effects. You might play with different apertures/shutter speeds to see if you can minimize them. Others may have better ideas?