Many of the Digicams have optional converter lenses. I have started looking at some for both topside and underwater usage. One thing that concerns me is the lack of threads on the front of some. Top side I like having a filter on the front for protection of the lenses. On my SLR they saved more than one lenses from my abuse.
I have been shooting my Leica down the desert and really like the f2.0 and 24mm but want more. Same when I am under water. Panasonic makes a converter lens that gets it down to 18mm. And there is a small dome for my housing for using it underwater. But no front threads on the lens. So I started looking at those made my Raynox which have front threads. But I am not sure how compatible they would be. For instance, the pana is a .75x while the one Raynox is .66 - not any big deal except for underwater as the done port might not work as well as one would like.
Next I wonder about compatibility given the Leica has a 24mm at its widest while most others are 28mm or more. Will I need to zoom out to prevent vignetting?
What about adapter tubes? For instance, the mount for the Leica is 46mm but the Raynoz is 52. I know I can use a step up ring. But what does that do?
So school me on these lenses. THANKS.
