Can a protection lens filter be left on between the lens and the WD58H without vignetting in the corners in full wide? If so is there a stop or color difference between a UV filter and clear? Tnx, Craig

you want to get a thin filter. Some of the better makers create special thin mounts just for this purpose. I can't say there will be NO vignetting fully wide but I've used such filters and not noticed a problem.

The adaptor itself offers protection to the cam's lens; to protect the adaptor, one without filter threads in front (which I would never consider), use a big, honkin' thick rubber lens hood, or a mat box.

Thank you both for the info...In run and gun shooting senarios I find that I'm often putting an adapter on and taking it off frequently, so I'll look for a thin 58mm clear filter for the lens and deal with the on off screwing...re. The wide angle adapter...I understand that the Canon has no filter threads for a protective glass...is there another adapter of equal or better quality that you can recomend? I own 2 Century adapters...one for the XL1 and one for a DV500...both are not zoon through, and both don't have front filter threads either. Thanks, Craig Hollenback

It's not a good idea to stick in a UV between the adaptor and lens, or put any filter in-between. However, if that's what you want to do, then I suggest the Hoya's high-end, ultra slim/multi-coated UV. The member, Bryan Beasleigh knows the one I'm talking about and where to get them. Perhaps e-mail him.

You may want to check out some of the Raynox adaptors, the ones I've seen all had filter threads. But I don't know if any of these are better than the WD58H.

Appreciate your input...yes, I agree the filter in between is not a good practice...and it is a pain trying to unscrew the adapter without taking the filter along with it. I been finding that as mentioned, I need to do lots of quick changes...and I like to have a filter over the lens if possible. I'll check out that other WD adapter that you mentioned...and try to find one with a filter thread up front. I'll repost if I find and purchase one and give a review.Tnx, Craig

Beware of over-tightening the UV filter when you screw on the wide-angle adapter!!! (I know from experience.)