For those complaining about not being able to use the tele-converter with a filter, note that the hood included with the adapter is threaded for 58mm filters. The hood does not stay secure over the lens, but if you carry a small roll of tape, you can use a couple pieces to secure it.I have only used this in practice, but came out with some very good, clear results. Like others, I know this is a zoom lens, but wish you could be able to back off the zoom a bit with out getting the tunnel effect. I think it will work out well, though. As to price, it's fair, especially as DSLR lenses run in the thousands, not mere $200.00 and less. Oh, yes, I purchsed this lens from Canon, and theAmazon price is considerably less.