Tag Archives: how to

Avoiding Purple Fringing

This week, because I used a very wide aperture (f1.7, f2.5) and the light is very bright right now in the day time, some of the photos I took got an unattractive purple fringing. I just noticed it after several photos and got a little mad with myself because I wasn’t paying enough attention.

Purple Fringing

Purple fringing is that sort of light “specter” you get on the edges of photographed subjects where the bright light and the shadows meet.

Purple Fringing zoom in

You can avoid that unappealing aberration if you use a narrow aperture when the light is very bright. It will give you longer depth of field (your background is going to be more in focus than with a wide aperture) but it will give you a crisper image with less chromatic aberrations around the edges.

To do that turn you camera to Aperture Priority Mode (turn your mode dial to “A”) and set the aperture (f value) to f11 or smaller (the higher the f value, the narrower the aperture).

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Motion Blur – How to

This is a recurring topic where I pick a photo from the Creative Commons library and feature it as Creative Commons of the Week.

Golden Zephyr

Photo by: Joe Penniston | License: Attribution-NonCommercial-NoDerivs 2.0 Generic (CC BY-NC-ND 2.0)

Great crisp photo of an object in motion.

As I talked about it in the comments of a previous post, you can achieve this sense of moving through space by following the subject’s motion with your camera while pressing the shutter button. It is called panning.

In this case the photographer shot it with a somewhat long exposure (1/20) and small aperture (f 25).
To do your own motion photos you will have to try different settings, depending on the time of day (light) and speed of the object but you can start by setting your camera for shutter priority (which is the “S” on your camera mode dialer) and set it to 1/30 or less. In the shutter priority mode your camera will “force” the aperture to give you enough light to make a well exposed picture. Sometimes this doesn’t work and you will have to try different settings. To do this switch the camera mode dial to manual (“M”) and try different apertures with the same slow shutter speed until you get the perfect exposure.

I find it helpful to experiment this technique in the side of a road where cars pass by. You will not have lack of moving subjects that way.

This is one of the first basic lessons I’ve learned that helped me understand how my camera works and how to take better photos with it.

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