[naturephoto1]

How is magnification achieved without spreading out the light? The fact that 50mm and 100mm enlarger lenses at the same print size will give the same times just confirms my point that it is the enlargement size of the print and not the distance that matters.

I had the same idea from John Shaw that diopters don't lose light. But Bjorn Rorslett corrected me on another forum and I have since done many tests to confirm his claim. See this thread for that exchange.

-A

Hi Anupam,

The diopters (the Nikon, Canon, and Leica Elpro are 2 or more? elements and do produce very very good to excellent results) have a negligible amount of light loss when mounted on the camera lens. There is substantially less light loss than working with extension tubes, extenders (basically an extension tube with lens elements), or a bellows. Regardless of the conversations on other sites or threads, if you question the small to no light loss of using such lenses just meter with your 35mm or medium format camera through the lens alone and/or through the lens with these diopter lenses attached. That will confirm how little light is actually lost. These lenses allow for much greater working distances than the extension tubes or bellows. I assure you you will see little (perhaps 1/6 stop or so) or no change to your meter reading.

Rich