Archived posting to the
Leica Users Group, 2001/01/24
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Subject: Re: [Leica] Y2 Filter humbug!
From: "Ken Iisaka" <ken@iisaka.org>
Date: Wed, 24 Jan 2001 22:30:27 -0800
References: <001501c08613$577bb6c0$d1541b3f@oemcomputer> <3A6F5082.1A8B3C85@primus.com.au> <3A6F5863.69ED31E2@rabiner.cncoffice.com> <3A6FACA2.B4AF4264@umich.edu> <3A6FB96D.7B4FFEC3@rabiner.cncoffice.com>
> red is the opposite of green, not blue, not cyan
Not really. In the additive system, the three primary colours consist of
red, blue and green. A red filter cuts both blue and green, leaving red
only. An orange filter cuts blue, and part of the green spectrum. A yellow
filter only cuts blue. Green filter cuts both blue and red.
Most filter manufacturers publish the spectral trasmission curve. That can
explain all the comments we've been making.
Replies:
Reply from Mark Rabiner <mark@rabiner.cncoffice.com> (Re: [Leica] Y2 Filter humbug!)
In reply to:
Message from "Wilber Jeffcoat" <wilber@jeffcoatphotography.com> ([Leica] Y2 Filter)
Message from "A.H.SCHMIDT" <horsts@primus.com.au> (Re: [Leica] Y2 Filter)
Message from Mark Rabiner <mark@rabiner.cncoffice.com> (Re: [Leica] Y2 Filter)
Message from "Dante A. Stella" <dante@umich.edu> (Re: [Leica] Y2 Filter humbug!)
Message from Mark Rabiner <mark@rabiner.cncoffice.com> (Re: [Leica] Y2 Filter humbug!)