Can I use above water diopter lens underwater?

[DazedAndConfuzed]

Hi

I have some diopter lens that I use to use with my old SLR lenses and was wondering if I can use them underwater as a wet lens? Rust? adhesives coming off? Lens coating not robust enough for salt water?

It is 52mm, so I would just get a 52-67mm adapter and screw it in front of a my housing's lens port. Don't think it would cause vignetting since the wet wide angle lenses has a smaller lens at the rear than the diopter.

 

[herman]

Ignoring lens damage, you can but it's pretty much a waste of effort. Due to the physics of the lens/water interface the effect is a lot less, by a factor of 4 if I remember correctly. A 4 diopter surface lens is effectively reduced to a 1 diopter UW lens, you would not want to bother with anything less than an 8 or more. Unless you have some really high diopter lenses it's not worth trying and multielement lens are not likely sealed well enough to stand being submerged....you will be better off to sell them and take the money to buy a real UW lens.

 

[Wisnu]

I've used cheap aboove water WA lens (consist of macro+WA) up to 20m and had no issue other than the quality of pic is not excelent.
Here is the report
http://www.scubaboard.com/forums/underwater-photography/338416-non-wet-wide-angle-lens-underwater-yes-work.html

 

[weeksd]

On my aquatica housing i use a +4 diopter with the six inch port. My buddy uses a +3 diopter for his 8 inch port. For 1:1 macro we add another +4 diopter inside the housing on the lens. Works very good for macro. We can zoom using our 16-85mm nikon lens from 1:1 macro to close focus shots.

 

[bvanant]

As mentioned above, putting the diopter on the lens inside the housing will give you lots more increase in magnification than on the outside and depending on the contstruction of your diopter you might lose a factor of 4 or so. Putting a plus 3 diopter on an underwater lens that is 1:1 might actually give you no magnification at all.

Bill

 

[DazedAndConfuzed]

shammed. Can't put it inside since this is a P&S. Maybe I can try a stronger above water diopter to offset the water. Oddly, the diopter was for my SLR when using my dome port.

Interesting test of the land wide angle wet lens. They are like 1/10 the price of the UW ones. Although other posts in that thread says they flood. But I got my Inon wide angle wet lens, I will make do with that.