Get closer to a subject by reverse stacking a lens.
The Canon EF 100mm lens can focus on a subject less than a foot away, but what if you want to get even closer to the subject without buying a bigger macro lens? Using a reverse ring mount that attaches to the EF 100mm's filter threads allows you to attach another lens to your camera. Thus, you can amplify the magnification and decrease the closest focusing distance for ultra-close macro photography.
Instructions
Installation
1. Remove the lens cap and unscrew any filters attached to the EF 100mm. Screw the 67mm reverse ring on the EF 100mm front filter thread.
2. Attach the step-up or step-down ring to the reverse ring, if you are using one. Remove the lens cap and unscrew any filters attached to the second lens.
3. Screw the second lens' front filter thread to the reverse ring. Remove the rear lens cap from the second lens.
Lens and Camera Setup
4. Set the camera to manual mode. Since you are using two lenses, the camera will not meter correctly in any automatic modes.
5. Set the EF 100mm's aperture to maximum width.
6. Set the second lens' aperture to its maximum width. If the lens does not have a manual aperture ring, you can wedge the aperture arm open with a small piece of tape or folded piece of paper.
Tags: reverse ring, second lens, aperture maximum, aperture maximum width, Canon 100mm, closer subject