These new rear lens caps from BlackRapid shout their focal length loud and clear.
If you're lugging around a bunch of lenses with you in the field, grabbing out the correct one when you need it can be a bit tricky. A new product from the folks at BlackRapid aims to help you spot the lens you want easily and quickly. The unfortunately-named LensBling is a series of rear lens caps, each of which are emblazoned with a focal length in large, easy to read letters.
The caps will be available soon through BlackRapid's website and dealers. Canon users will be able to pick from 24mm, 24-70mm, 50mm, 85mm, and 70-200mm, and Nikonists can chose 24mm, 50mm, 85mm, 70-200mm and 105mm. Some might argue that you could get the same effect using masking tape and a marker, but LensBling caps will be far more resilient, and with an asking price of just $8.50 it's not that much more expensive than buying a plain one.
If your favorite lens or mount is immediately available, BlackRapid is planning on rolling out more options. Or, you know, you could use a piece of tape. Or just use a silver Sharpie.