You can use a 50 mm lens, whether a Sigma brand or another, as a macro with this handy trick.
Using any 50 mm camera lens in reverse, including a Sigma 50 mm, is like having another lens in your camera bag, according to the Digital Photography School. Reversing the 50 mm with an adapter ring means you can take ultracloseup images, as if you were using a macro lens. There are some tricks to doing this well, and you must remember to protect the reversed lens from dust, moisture and the environment, as it will be exposed to the elements.
Instructions
1. Purchase a reverse adapter ring. Consider the make of your SLR camera when choosing your adapter ring, as each manufacturer's lens mount is slightly different. B&H Photo Video, for example, listed 27 reverse adapter rings -- suitable for Nikons, Canons or other camera bodies -- available for purchase in September 2010 for under $15.
2. Attach the reverse adapter to your camera body and screw the Sigma 50 mm lens backward onto the reverse adapter.
3. Take macro photos. Since the pins of the lens and camera will not be connected electronically, there will be no communication between the lens and the camera. You will need to use your SLR's manual settings, and focusing might require trial and error.
4. Use the small lens protector that came with the SLR package to keep your 50 mm lens protected while reversed.
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