Re:snorkel mask w/ prescription lenses. to correct my nearsightedness, do I enter the ""DV" or "NV" number? my NV is 2.25. should I order 2.5?
65715
I ordered the mask for my girlfriend who is near-sighted. She gave me a copy of her prescription. Under the "Dist" part of her prescription, sphere is -8.5 which is the number I used when I placed my mask order. I am assuming "DV" is distance, and "NV" is near. If so, I believe you would enter the "DV" number. The mask worked great for my girlfriend. She said she could see better out of the mask than her glasses. Hope that helps, Brian H.
438324
These glasses actually do have a magnification of +.25. I actually took them to my eye doctor and they measured the power for me. To put this in perspective, many reading glasses are +1 magnification. +.25 is the smallest increment, incrementing at .5 .75 and 1. So, the magnification is quite small, it just helps things become a little clearer.
40139
That's the method we used when buying my daughter's goggles. She ended up with -3.625 (R) and -4.25 (L) so we split the difference with a -4 prescription. She says they work well enough for her, and she has to be read a white board to get her workout during swim practice.
2272777
I don't own an SX, but the filter size is typically written on the front of the lens. Should be a number followed by a circle with a line through it. If it says 58, you're good to go.
21876
goggles dont come in sizes but in styles. Its wathever feel more conmfortable to you, the adjustment is done thru the strap. If you are talking about prescription it is usually what your glasses prescription is if its different on both eyes go with the lowest prescription. otherwise you will feel disoriented.
857710
Sheryl; The first number (7, 8, 10, etc.) is the power or magnification of the binocular which means a 10 brings the image 10 times closer than the naked eye sees. So the higher the number usually means a better binocular assuming the lenses are of high quality. But a higher magnification also requires a steadier hand. The second number describes the size of the front lens. A 25 will be larger and therefore bring in more light than a 21 and is usually a better unit. So most people would opt for the 10x25 over an 8x21.
62042
Sorry, our lens only adjust single vision. If it is for snorkeling, bifocal/reader lenses are not necessary.
30301
The size options are the prescription options. You will need your prescription handy to order them. You just choose the size closet to your prescription and then the company inserts the right lenses into the goggles. I believe there is an option to not use prescription lenses at the very bottom of the size list too.
1503374
The 25 and 36 refer to the size of the lens opposite the eyepiece in mm. The larger the lens the more light it gathers. This of course makes for a heavier monocular and a larger one. I have a 10x25 and it is fine. You have to have a steady hand though in using the devise.
1307287
I have the original size. It doesn't bother me and I don't see it anymore unless I want to. The distance depends on how well your eyes focus. Are you near or far sighted? I am very happy with it. it clips on to the left earpiece of my sunglasses.
1635572
What I was told with 3.5X loupes is the focal distance should be at least 24-36". I must admit, I was "off" until I finally got myself to hold my head away from the patient at least that distance. Otherwise, everything is blurry. I'm also trying the 2.5x loupes now.
886612
If I understand your Query correctly you need to wear reading glasses. Correct? The EOS Canon cameras have a pretty extensive range of adjustability built in. If you need something additional (rather unlikely) then match the diopeter number to the number you wear with your reading glasses. Such as +1.5 or +2.5...I purchased this adjustment lenses but actually found out the Canon had the correct adjustment on the camera for me around +1.75. So I don't use this piece.
57695
The goggles only come with a negative value which is for near-sighted. Mine were totally useless, terrible distortion, I could not use them and was given bad information by customer service. When I complained, iI was treated rudely. They offered no positive numbers for far-sighted
1276663
I've been using the 14-24mm f2.8 for a year now. Tack sharp! No lens creep. I was worried about no filters to protect glass also. Built in lens hood protects front element well enough. Lens cap fits OVER hood when not in use. I am comfortable with that. No VR doesn't seem to be an issue, as a lot of light comes through the glass and allows higher shutter speeds I feel. I generally shoot with a standard ISO of 400 to kick it up the speed a bit. Great lens. I also use the 24-70mm and 70-200mm lenses, both at f2.8 as well. Throw any pic from these three lenses on you monitor and you could cut yourself on the sharpness. LOL. I've been using the 14-24mm f2.8 for a year now. Tack sharp! No lens creep. I was worried about no filters to protect glass also. Built in lens hood protects front element well enough. Lens cap fits OVER hood when not in use. I am comfortable with that. No VR doesn't seem to be an issue, as a lot of light comes through the glass and allows higher shutter speeds I feel. I generally shoot with a standard ISO of 400 to kick it up the speed a bit. Great lens. I also use the 24-70mm and 70-200mm lenses, both at f2.8 as well. Throw any pic from these three lenses on you monitor and you could cut... » Read More I've been using the 14-24mm f2.8 for a year now. Tack sharp! No lens creep. I was worried about no filters to protect glass also. Built in lens hood protects front element well enough. Lens cap fits OVER hood when not in use. I am comfortable with that. No VR doesn't seem to be an issue, as a lot of light comes through the glass and allows higher shutter speeds I feel. I generally shoot with a standard ISO of 400 to kick it up the speed a bit. Great lens. I also use the 24-70mm and 70-200mm lenses, both at f2.8 as well. Throw any pic from these three lenses on you monitor and you could cut yourself on the sharpness. LOL. « Show Less
838238
18-55 doesn't matter. It is the size of the threaded ring on the end of the lens that dictates what size filter to use. It is usually indicated on the Face of the lens.
62039
When you snorkel, you wouldn't be using your bifocal lens. You should order the lens that you need for distance sight.
1239794
i put the anti fog solution on my mask and i can see that being a problem. if you wear prescription glasses get prescription lenses in your mask. mine are all i need to see pretty well. if you dont i would have to say its a 15 dollar gamble.