mmb 0 Posted June 1, 2005 With +3 dioptries lens: Without the +3 dioptries lens: Share this post Link to post Share on other sites
anthp 0 Posted June 2, 2005 Can't really see any difference. Any chance you have the same shot with and without the diopter? Share this post Link to post Share on other sites
danschmitt 0 Posted June 2, 2005 I can't really tell at this resolution, but it looks like the "without the diopters" are a little mushy at the corners (or the cup coral has been smushed somewhat.) (I also suspect getting the same shot for with and without the diopter is tricky <since you have to open the housing.>) I remeber that diopters were reccomended for making lenses focus close enough to the virtual image of the dome, but I don't know what the current wisdom is for the the super wide zooms. All the housing manufacturers are quick to say "ours works great for that lens, no diopter required", and I have to wonder if a +3 diopter on a 12-24mm lens is much different than zooming in to 18mm to just miss the mushy corners. I've got a 10-22 on the canon 20d behind the aquatica with the big dome, and at 10mm the edges get mushy underwater (it also happens on land, but to a much lesser extent, so I'm hesitant to plop down the $66 a shot for various 77mm diopters to see if it's a dome issue.) Share this post Link to post Share on other sites
