Picture of DIY Macro Lens For S3
Here you'll find the steps needed to make the macro lens to fit on you Otterbox Commuter Series case.

Step 1:

Picture of
You'll see that this is a lens from a film\darkroom enlarger. You can do a search on ebay for an Anastigmat lens. Here's the full name of the lens I used for this project

Anastigmat Fedar Enlarging Lens 3.5" 90mm F6.3 on mounting plate