Archived posting to the Leica Users Group, 2001/07/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]John Collier wrote: > Underwater the lens's angle of view tightens up quite a bit. Your 28 > underwater will have the coverage of a 35 on land which should be just about > right for most below the sea shooting. Focusing will be a problem underwater > as I do not think the auto-focus will work. Test in your bath tub tonight > and see:-). I am not joking! Can you lock the focus some how? Make sure you > check this out as you do not want a bunch of rolls with everything fuzzy. > > I use my Ms around sea water with no worries. If it gets wet rinse it as > soon as possible with fresh water. Regardless when you get back to base, > wipe all your gear down with a damp cloth. Your cameras will be salty even > if they do not get wet. > > John Collier At the ocean shore what happens is salt spray dries in the air leaving tiny 'floating' salt crystals, they land on everything and can drift into everything. Just always wipe off your gear with a damp cloth, everywhere you can reach. No problems if you do this. I don't think any autofocus works underwater though I have seen housings for all sorts of cameras. I would think the change in refractive index is the problem. This is why that 28mm lens' angle of view is different underwater. As John says it's more like a 35mm lens when underwater. Dennis