Achromatic Diopter vs. Close-up Lense, what’s the difference?

[Rennie Klymyk]

[adventusfilms] “Achromatic Diopter vs. Close-up Lense, what’s the difference?”

You could ask “Achromatic Diopter vs. Achromatic Close-up Lense, what’s the difference?” also besause the term Achromatic is used as an adjective here to describe the characteristics of the lens. An (A-chromatic) lens focuses red and blue visible light at the same point and therefore it is basically free of color bias. It does not introduce any color of it’s own into the mix (of the light that is passing through it) Cheap lenses will alter the hue of color passing through and perhaps distort it also.

FYI – another type of lens (APO-CHROMATIC) lenses focus all three primary colors on the same point. They can be double the price or more, than a standard lens as special types of glass are required to produce them and they are finished to finer tolerances.