The Canon S3's manual recommends the 58mm adapter, possibly because there is a danger of vignetting with the smaller filter size with some addon lenses, particularly if they're stacked. I bought the Canon original, which I believe is only available in 58mm, because Lensmate adapters aren't sold in the UK.
I have been mulling over a teleconverter too, but I wonder what improvements one will actually bring, bearing in mind that the telephoto range of the S3 is already pretty good. They add softness to the edges of the frame and increase the effects of camera shake. Would a 1/1.7 crop in practice be almost as good as a 1.7 tc?


