I thought these lens cap leashes would be great - I'd just gotten a Canon XSi and wanted to protect the caps of the two lenses (I often try to lose the caps to my husband's lenses). But, the tether isn't long enough to reach easily from the cap to the camera body, even for the smaller of the two lenses. Also, what if you have lenses with different cap sizes? The fastener isn't really easy to clip on and off.I wish I'd looked around more; I remember having a lens cap tether with an elastic band that went around the lens itself, and I think that would have been a better product.Still, it was a cheap lesson, thank goodness...