 BetterPhoto Member |
Hyperopia (Farsightedness) and Focus Last year I had Lasik eye surgery to correct for nearsightedness. This made my hyperopia more apparent (I'm 44 years old), so my close focusing is not as good. I recently took a new Subeye SLR 35mm camera underwater, shooting with a 50mm Nikonos RS water-contact lens. I was focusing very carefully on the eyes of my subjects (fish, etc.) but upon processing my film I discovered that the focus on the slide was typically behind the eye or foreground. A pro in my local camera shop said I need a "diopter", or contact lens in my eye to correct. Alternatively I could do something in the scuba mask. What is necessary to determine the proper power required to make this adjustment?
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John Quental |
Hi Ron. I think your focus problem is not your vision, but may have to do with the air/water interface. Light refracted off your subject in the water, then the air in the camera and mask is refracted in a way so as to say that the subject looks 1/3 bigger and 1/3 closer than it actually is. Try focusing 1/3 the apparent distance behind your mark. This would be the true distance of the subject. (i.e. if the subject looks like it's 3 feet away, focus at 4'.) PS aim your flash @ 4' also. Good Luck JQ
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