Re: Infrared lenses

[boblong@xxxxxxxxxxx (Robert Long)]

On Fri, 24 Jan 1997 20:02:15 GMT, Rubem Amaral wrote:

|I'm sorry if this matter has already been discussed here, but did=20
|any of you ever tried using infrared lenses? When I went to the
|US last year I noticed that they were being sold in almost every
|photo stores. Do they produce the same effects of IR films?

I've lived and worked and taken pictures in the U.S. for...well, a
number of decades and never that I can recollect encountered that
expression: "infrared lens."  Some vendors do make a surprising fuss
(considering general market attitudes) over the fact that some lenses
have an IR focus calibration on the barrel.  Perhaps this is what
caught your attention.

=46ilters appropriate to IR photography sometimes are called IR filters,
but I don't imagine that's what you're talking about.  If you *are*
talking about IR-calibrated lenses, then the answer is no, they don't
create the same effect as IR films--unless they are used to expose IR
films through an appropriate filter.  But they will give you a
somewhat better shot at sharp focus when you do use them with IR films
and filters.

Bob Long
(boblong@xxxxxxxxxxx)

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End of INFRARED-PHOTOGRAPHY Digest 189
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