Application of Close-up Lenses 

Close-up lenses typically mount on the filter thread of the primary lens, and are often manufactured and sold by suppliers of photographic filters. Nonetheless, they are lenses and not filters. Some manufacturers refer to their close-up lenses as diopters, after the unit of measurement of their optical power.

Close-up lenses do not affect exposure, unlike extension tubes, which also can be used for macro photography with a non-macro lens. 

Optical Power of Close Up Filter

Close-up lenses are often specified by their optical power in diopters, the reciprocal of the focal length in meters. For a close-up lens, the diopter value is positive: the bigger the number, the greater the effective magnification.

Higher quality achromatic lenses commonly lack a strength specification in diopters. It can be inferred as the reciprocal of the maximum specified working distance in meters (i.e., a lens with a maximum working distance of 25 cm has a strength of +4 diopters).

Several close-up lenses may be used in combination; the optical power of the combination is the sum of the optical powers of the component lenses. For example, a set of lenses of +1, +2, and +4 diopters can be combined to provide a range from +1 to +7 in steps of 1.

Picture of Close-up Filter

Specificaitons of 58mm Close-Up Filter

Video of Close-up +4 Camera Close-Up Filter

People akso ask

Are close-up filters any good?
Macro Photography on a Budget: An introduction to Close-up ...
Using close-up filters is a great way to get started with macro-style photography, but they have some very important limitations that you need to be aware of to start. First of all, they only do one thing, which is shorten the minimum focusing distance of your lens.

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