lens for 25mm thread

[iflyfree 0]

i bought a hc42 which has a 25mm thread size. what is the best .5 wide angle lens fir 25mm, for shooting tandem video.

[ltdiver 3]

Here ya go.
ltdiver

Don't tell me the sky's the limit when there are footprints on the moon

[indyz 1]

Royal Lens makes a sweet low-profile .5 with 25mm threads (here), for $160. If that is to rich for your blood, you can try a Kenko SGW05 (here) with a 37-25 conversion ring (here), for a total of about $35.