With a single lens reflex camera, when is it recommended to use an assessory dioptric corrector lens?

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The gregorian chant was a major cultural milestone in the middle ages. it was one of the first codified forms of music meant to be played as written, where previously it was difficult to mass-produce and disseminate any music. what's more, these chants were also some of the first examples of musical notation: the notes and bars of today's music sheets are a reflection of centuries of evolution beginning with these chants. it became official throughout the entirety of the catholic church, meaning that nearly all of europe followed this musical notation and styling.

J. vincent scarpace makes fish art and if you look it up its very beautiful work. his original work can be found in private or public places in 40 different countries.
he is now retired, but he still makes his unique fish art. he refers to his art as " a personal journey through the use of basic of art elements; line, shape, and colors - resulting in works of art which purposely resemble fish. "