"Kotsinadelis, Peter (Peter)" wrote:
> Geoff,
>
> You bring up a good point. Adding another glass/air surface can cause a
> problem. A hood is the best insurance one has against this added surface to
> cause a problem at all. The reason you use a UV is to pull out the blue in
> high altitudes or near the ocean. Aside that they gain you nothing. UV
> filters are defined by L #s. The higher the # the better the filter to
> eliminate UV. Hoya is an L39 but the new Super HMC Pro UV are L41. Nikons
> and others are L37 (surprise!).
> To see if your UV is worth anything, place it on a flurescent light (light
> box if you have one). If the UV turns a yellow tint with the light on its a
> decent filter. If it does nothing, its junk!
>
> Peter K
> *
My "UV" filters are standard grade Hoyas. I just put one on the light box, and
guess what? I can't see even the slightest yellow tint. I think I'll still
hang onto them as emergency lens caps anyway.
Geoff
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