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It would depend on what type of camera you have. I would start with EBay. They have tons of used camera lenses available. You can also check out Amazon. They have a warehouse area on their website.
bioconvex lens
There are a few camera lens types such as : a wide angle lens (used to capture a larger area than the area visible by a human eye), telephoto lens (opposite of wide angle), panoramic lens and so on.
She used and prefered the square-format twin lens reflex
to take a picture
Lens
The camera that is best used for crime scene photography is a single-lens reflex camera, also known as SLR. This camera allows you to use interchangeable lens.
Camera lens filters modify images that are recorded. Sometimes the filter affects the image only slightly, other times pictures would not be possible without the filter.
The distance it will focus will depend upon the type of camera being used. It also depends upon which 300 mm lens you are using.
it spreads light rays apart,or it is used in a camera lens.
no. its lens like glass for you to see far or near
A Macro 70 sounds like a fixed focal length lens (70mm) capable of close focusing (macro). This type of lens is used to photograph small subjects such as insects and flowers.