Sharon asks…How can you consider a DSLR lens to be FAST?mr.eos answers:Inside the lens is what's called the diaphragm which is made up of thin metal blades which are movable and used to form the aperture or f-stop - the opening that allows light to pass through the lens. The larger the opening the more light the lens admits.
Another major component in lens speed is the type of glass used in the various elements inside the lens and the number of groups of elements. I have in my collection a
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