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Photography Tips & Tutorials
The concept of hyperfocal distance is easy to understand: focus a lens at the hyperfocal distance and everything in the photograph from some near distance to infinity will be sharp.
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The Two Basic Filter Systems There are two basic filter types or systems to choose from, the screw-in and the slide-in types. The first are circular integrated filters with a mounting ring that screws into the front thread of a lens, and with a thread on the other end to screw other filter(s) or attach a hood. The second consists of a threaded adapter to screw into the front of a lens and a filter holder with one or several slots, where square or quadrangular optical resin filters slide-in.