Marumi Achromat 200 +5 Filter DHG 67mm

Marumi Achromat 200 +5 Filter DHG 67mm

The Marumi Achromat 200 lens has a multi-coating that makes the lens water, scratch and dirt resistant. The lens shortens the focal length, so you can get closer to the subject. Ideal for close-up and product photography. The specially designed ring prevents unwanted reflections. Compared to non-chromatic lenses (normal macro filters), this DHG lens increases sharpness and shows more details on difficult objects like glass and jewelry. It is not necessary to increase the exposure time.

power of an achromatic lens is expressed in diopters, in this case + 5. Use the following formula to calculate how to reduce the minimum focal length with a particular macro or close-up filter

Formula

X is the minimum focal length of the lens in meters and D is the diopter.

Calculation example
You have a lens, with a focus from 55 cm and you use this lens with a diopter of +5. In this case the calculation is:
0.55 (5 * 0.55 + 1), and this is the same as :
0.55 : (2.75 + 1) or:
0.55 : 3.65 = 0.146 meters, which is 14.6 cm.