James Malamatinas Posted February 25, 2013 Share Posted February 25, 2013 Hi, I've been a camera assistant for a few years now and understand the effect of lens concepts e.g. opening up decreases DoF, however I'm not trying to understand the why, and the mechanics of a lens and how it affects the image. Can someone please help me understand a few basics, I'm going to try and understand them one at a time so my first question is below: 1. Why does changing the aperture not affect the angle of view?I have attached a diagram from a book I'm reading showing light travelling in a lens with a wide open aperture, and also in a stopped down aperture. What happens to the rays of light that I have highlighted in red, in the original diagram these lines do not exist and instead the light is shown as simply passing through the smaller aperture, however if the aperture is not affecting the actual focusing ability of the lens there must still be rays of light being refracted along these lines. What happens to these rays of light that are now hitting the closed down aperture? If these were contributing to the final image wide-open, why does the image not change when stopped down? I'm sure I've made it sound more complicated than it is with that description! Thanks, I'm sure they'll be plenty more to follow! Any suggestion on places to read up on the basics of lens mechanisms would be great too.James Quote Link to comment Share on other sites More sharing options...
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