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Digital Lifestyle
Images, Graphic Design, and Digital Photography
Digital Camera help???
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<blockquote data-quote="Peakoverload" data-source="post: 347555" data-attributes="member: 27271"><p>Actually the problem with cheap lenses comes before seeing their results in print.</p><p></p><p>Let me give you an example.</p><p></p><p>Let's say you are trying to capture a bird of prey in flight, a fast moving subject requires a fast shutter speed and the chances are you will be using a focal length in excess of 200mm, this means that you are probably looking at using a shutter speed of 1/500th to avoid camera shake and too much motion blur. However the conditions are a little cloudy and your lens largest aperture is f/5.6 at that focal length. This means that with the available light you are unlikely to get a fast enough shutter speed so you could miss the shot and not have a 8" x 10" to look at.</p><p></p><p>Okay, yes you can of course increase your ISO but the higher the ISO the more noise that is introduced. So lets say that at ISO 100 and using your lenses largest aperture of f/5.6 your camera told you the fastest shutter speed you could get was 1/125th. If you had a lens that could go to f/4 than the shutter speed would be 1/250th and if you had a lens that could go to f/2.8 it would be 1/500th.</p><p></p><p>So basically better lenses will help to increase your hit/keep rate and reduce your miss/delete rate but that's not the complete picture either.</p><p></p><p>The way a lens works is by focusing all the light rays entering the lens to a single point on the film or sensor, however as light enters the lens it gets picked up by the various lenses and parts of the light are defracted. If the lens defracts too much then you get what's called chromatic aberrations which typically shows up as a purple fringe to for example a tree's branches against a bright sky. Aberrations like this are more obvious in high contrast areas and although some of this can be corrected in software it is a bit of a pain and not ideal.</p><p></p><p>So will you look at a 10" x 8" shot on either of your lenses and think "I wish I had better lenses"? Possibly. However what is more likely is you will eventually wish you had better lenses whilst you are actually taking the photos in the first place.</p></blockquote><p></p>
[QUOTE="Peakoverload, post: 347555, member: 27271"] Actually the problem with cheap lenses comes before seeing their results in print. Let me give you an example. Let's say you are trying to capture a bird of prey in flight, a fast moving subject requires a fast shutter speed and the chances are you will be using a focal length in excess of 200mm, this means that you are probably looking at using a shutter speed of 1/500th to avoid camera shake and too much motion blur. However the conditions are a little cloudy and your lens largest aperture is f/5.6 at that focal length. This means that with the available light you are unlikely to get a fast enough shutter speed so you could miss the shot and not have a 8" x 10" to look at. Okay, yes you can of course increase your ISO but the higher the ISO the more noise that is introduced. So lets say that at ISO 100 and using your lenses largest aperture of f/5.6 your camera told you the fastest shutter speed you could get was 1/125th. If you had a lens that could go to f/4 than the shutter speed would be 1/250th and if you had a lens that could go to f/2.8 it would be 1/500th. So basically better lenses will help to increase your hit/keep rate and reduce your miss/delete rate but that's not the complete picture either. The way a lens works is by focusing all the light rays entering the lens to a single point on the film or sensor, however as light enters the lens it gets picked up by the various lenses and parts of the light are defracted. If the lens defracts too much then you get what's called chromatic aberrations which typically shows up as a purple fringe to for example a tree's branches against a bright sky. Aberrations like this are more obvious in high contrast areas and although some of this can be corrected in software it is a bit of a pain and not ideal. So will you look at a 10" x 8" shot on either of your lenses and think "I wish I had better lenses"? Possibly. However what is more likely is you will eventually wish you had better lenses whilst you are actually taking the photos in the first place. [/QUOTE]
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