Understanding Depth of Field.
October 15th 2007 05:12
Fine focussing
Calculating the correct aperture to achieve the correct depth of field requires a combination of time and experience.
With modern cameras the inbuilt computer usually does it for you.
Advice No. 1. GET TO KNOW YOUR CAMERA
What is it? It is the distance in front of and beyond the subject that appears to be in focus. This is Wikipedia's simple explanation accompanied by the following image which shows clearly the letters which are in focus and those which are not.
The clear section - depth of field
The smaller the aperture the greater the depth of field.
Increasing the depth of field increases the sharpness of an image.
For those who can adjust their cameras you need to become familiar with F numbers and the calculation of the depth of field for each.
I may be wrong but I doubt whether there are too many of my readers that are still using cameras that need manual adjustments.
Depending on the sophistication of your level of photographic skills your requirements feasibly vary.
You may get to the stage where you need to upgrade your camera and/or use more than one.
From Physics, we can understand the 'circle of confusion' caused when light rays cross and distort, losing the sharpness of the image.
I've acquired this diagram for those interested and who have an elementary knowledge of Physics and I suggest everyone at least 'looks at it' to get an idea that the sharp focus becomes blurred around this area.
Depth of field and circles of confusion
I'll give you another couple of images to show you the sharp focus and then the blur.
The blur around the central image.
Shallow depth of field
I hope you liked this post, your comments will be appreciated.
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