HELP! Which lens cap for Canon S3 adapter? 52mm or 58mm?

[Chode]

Help me please, I want to buy LAH-DC 20 lens adapter for Canon S3 IS, and a Lens Cap for it. But which one?

Canon Snap-On Lens Cap 52mm (E-52U)

or

Canon Snap-On Lens Cap 58mm (E-58U)


Which one fits?

This is what I want for:

 

[EOS_JD]

58mm

See this review

http://www.dcresource.com/reviews/canon/powershot_s3-review/

"While the lens itself is not threaded, you can remove the plastic ring around the lens barrel (by pressing the button to the lower-left) and attach the optional conversion lens adapter. From there you can attach one of the three conversion lenses I mentioned earlier, or any 58 mm filter."

 

[Chode]

great! tnx!