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Why do prime lenses give a sharper image than zoomable lenses?
Of course I mean the in the focus area. They give such a better picture at all different focal lengths. What are the technical reasons why?
A zoom lens is a series of compromises since the focal length is variable. The lens elements must physically move inside the lens body to change the focal length so the lens designer has to choose which focal length to optimize or whether to compromise and try for "good" at all focal lengths instead of "good", "better", "best". When the zoom lens also has a variable aperture such as
f3.5-5.6 the problems are exacerbated.
Zoom lenses with a constant aperture also feature better elements with better coatings and this is reflected by their price. The Nikon AF-S Nikkor 70-200mm f2.8G ED VR II is $2,169.00 while the AF Zoom-Nikkor 70-300mm f4-5.6G is a mere $154.95 and the AF-S VR Zoom-Nikkor 70-300mm f4.5-5.6G IF-ED is $529.00. Which of those 3 lenses do you think will perform best?
A prime lens has one fixed focal length so the design can be optimized to produce the best results. The lens designer doesn't have to contend with lens elements changing position to change the focal length. However, all lenses have an aperture that produces the best possible results - usually between f5.6 to f11.
This was taken using a 200mm prime on a 35mm film camera:
http://www.flickr.com/photos/drifter45h/4048796836/ ISO 200 film, f11, exposure of 30 seconds. I will be making a comparison with my 70-210mm f4 zoom whenever the weather permits. We're stuck in the hazy, hot and humid mode here in the Ohio Valley and those aren't optimal conditions for the test.
VR226-Sharper Image Rotating Speaker System