Re: HELP with Nikon F90X/N90s It depends. UV filters are designed for situations where there is too
much ultraviolet light and the film is sensitive to it. For example,
color slide films in the mountains.
They are sold by camera stores as "lens protectors". Usually brands with
optical quality less than window glass at high prices. It's because a
Nikon filter may cost $25 (for example) while a Korean made piece of
junk with a soft plastic rim (which makes proper aligment impossible)
holding a piece of cheap glass costs them $.50 including the box.
The salesman are told to push them along with worthless "extended warranties".
The way to tell is that ANY filter is opticaly more harm than good without
a lens shade. This is because light that strikes the filter at an angle where
it won't reach the film is reflected into the picture and creates highlights
that should not be there and other out of focus "junk". Putting a lens shade
on it, prevents that light from hiting the filter.
The junk UV filters are sold without lens shades, so not only are they optical
disasters, but they add odd angle light problems to the damage they cause
to your pictures.
Good UV filters with a lens shade are helpful, but not always necessary.
Since the lens in question is designed to be used a close distances, many
people use it the with electronic flash. Electronic flash light is very high
in UV. If your flash is not UV corrected on its own, for example a bare
flash tube, then using it will produce a better photograph.
The problem with doing that is a lens shade might get in the way.
IMHO, you would be better off spending the money for a good filter on
film and processing or a photography class.
If you have an uncorrected flash or you live in the desert or mountains,
then get one, but make sure it's a good one and you get the proper lens
shade for it.
Geoff.
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Geoffrey S. Mendelson, Jerusalem, Israel gsm@mendelson.com N3OWJ/4X1GM
IL Voice: (07)-7424-1667 IL Fax: 972-2-648-1443 U.S. Voice: 1-215-821-1838
Visit my 'blog at http://geoffstechno.livejournal.com/
Gsm@mendelson.com (Geoffrey S. Mendelson
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