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I'm curious about how the optics work in lenses

Started Apr 4, 2014 | Discussions thread
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I'm curious about how the optics work in lenses
Apr 4, 2014

As far as I can tell your lens bends light, more so at the edges due to its curvature and it narrows all of that into a smaller point which is shot onto your sensor.

Needing to focus (moving the lens back or forward) seems comes into play due to the lens not bending the light quite right because it's shooting that light unevenly onto the sensor, hence the out of focus image.

Is that correct?

I still can't wrap my head around how opening or closing up the iris can give you a larger or smaller depth of sharpness as far as the optics go. I can understand that aperture gives whatever's in front and behind the field a blurry look, and I think it goes along with your lens shooting the light on over unevenly like I just said about focusing, but I don't know exactly how it's doing that.

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