The Duclos PL macro tube set decrease the M.O.D. (Minimum Optical Distance) of a PL-Mount lens to obtain similar images to macro lenses without sacrificing image quality with a low brightness loss.

These tubes can be used with Super 35mm or Full Frame lenses and cameras, nor with anamorphic lenses.

Estimate magnification rates:

Tube (mm) / Lens focal length (mm) = Magnification factor

Indicative brightness loss:

0.1- 0.2x = 1/2 stop

0.25-0.33x = 1 stop

0.5x = 1.5 stops

1x = 2 stops

Example:

A 85mm lens with a 35mm Duclos PL macro tube:

35/85 = 0.41x magnification and 1.5 stops brightness loss