You can try this with any lens as the primary lens. In this set-up, the 85mm lens is called the primary lens and the reversed lens the secondary lens. For best results in terms of image sharpness stop down the primary lens to at least f4. If you already own a 50mm prime or standard kit lens around mm focal length range then reverse lens macro is also the least expensive way there is to get up close. The reversed lens technique does leave the rear element of your reversed lens open to the elements. This helps protect the rear element and also acts as a lens hood. You should always take care with the reversed lens to avoid scratching the exposed element. For best results, use a tripod to keep the camera steady, and a cable release to fire the shutter. In normal use, a 50mm lens focuses light from far away so that the image is much smaller and can be recorded by a digital sensor or on film.
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