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The larger one will give you better results because it is a larger diam. (more light) and better quality glass. (those 2 pics are not to scale) The larger has 58mm threads and the smaller you need to use an adapter to get to 58mm. they both will work on the f717 because that camera is basicly a video camera type lens setup. (not SLR) Your not really looking thru the lens, your looking at a miniature lcd display that's displaying the ccd's output.
I would probably go with the smaller one because the larger would look kinda funny on that little sony camera and would really throw it off balance and make it harder to handle.
It's not going to be a night and day difference between the two (just a little) so for just casual stuff I wouldn't worry about the loss of quality of the smaller one.
Cheers,
BV
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