Reversing Lenses for Macro Photography

The lenses used here are a cheap Tamron 70-300mm and a Minolta 50mm. Each lenses ring (filter) size will determine the adapters that you'll need. I used a 62mm to 62mm coupler for the 70-300mm and a 49-62 step up ring for the 50mm. All of which are shown below:

 Next, simply attach the ring to the corresponding lens. Should look a little something like this

 Now just combine the two lenses into one by way of the rings:

 VERY IMPORTANT. You'll want the aperture on the 50mm (or whatever lens you're using) wide open. If your lens doesn't have an aperture dial you'll have to wedge the slide open. This is where the folded piece of cardboard or paper comes in. In the image below, I used a piece of notepad paper folded just enough to open the aperture and fit snugly. Use whatever works for you but I find that it is hard to damage the lens by using this method.