Some months ago I purchased the Nikon WC-E68. It's a wide angle adapter for Nikon's Coolpix 5000, a prosumer 5 megapixel digicam that was $1100 new and sported a very good fixed lens. That camera is long obsolete and the wide angle adapter had been discontinued.

I picked one up from ebay for $40 and a 46mm to 37mm adapter for $10.
I use it permanently on my panny SD5.
Distortion and colour abboration are almost non existant. It is reported to have no decrease in light throughput. It is a remarkable lens.
However I noticed the camera now hunts for focus one in a while and the images are a smidge softer. The lens is also very heavy and weighs almost as much as the camera.

I have twin babies and don't have to comprimise my indoors shots anymore. I get them both in in the corners of the frame (where distortion should be the worst) and get great footage.

Hey, you're right, works nicely! That lens is nearly as heavy as the camera itself! Really makes for a change holding it. I've got mine on a Canon HF100.

One question, where can I find a 37mm rear lens cap? I'd rather not have to unscrew the adapter from the lens every time I want to store it.

Forgive the noob question but why are the Nikon adapters so long (1.5 in)? Most 37mm-46mm step-up rings are quite short - will they work just as well?

Thanks..

I picked up a cheap step-up adapter off ebay, it's very short. Barely thicker than a filter.

The lens itself is, of course, longer. Could you be misinterpreting the length of the lens itself, not a step-up adapter?