newbie question

[nwyman]

Am brand new to all this. Recently got a Powershot S1 and have some questions.
First off - I got the impression from this forum that I can use filters with the teleconverter for the S1 if I attach the adapter, then scew on the filter, then screw on the teleconverter.
I have a friend with whom I discuss these things online - she says this shouldn't work, due to light bending, etc., etc.
Which of us is correct, please?

[PacAce]

If you can use a filter in front of a lens or converter, then there's no reason why you can't use it at the rear. AAMOF, the bigger lenses used on the SLR-type cameras have filters that drop into a slot at the rear of the lens because otherwise, a very large and expensive filter would be required if the filter had to screw on to the front of the lens.

[nwyman]

thanks so much for your response!

Now, on to the second stupid question.

I bought the S1 on line for a very good price from what I later found was a very unreputable dealer. As part of the "deal" they sweet-talked me into a BOGO sale on converters. They were upfront in these not being Canon, so I really wasn't expecting to much, but what I got has me mucho confused.
The teleconverter is 52 mm alright, but it is only about a third of the size of the actual Canon product (which I have since purchased). When I tried to use it, and zoomed out to the max. distance, I'd hear a "clunk" followed by an E18 (which I now realize is a lack of lens motion response.
This didn't always happen- only when I zoomed in a hurry.
So, is this product (which is labeled "professional digital" as big a scam as I think it is, or am I just too inexperienced to know what to do with it?