Re: Infrared filter

["Charles Andrew" <candrewpsu@xxxxxxxxxxxxx>]

I contacted the medical microscopy department at Johns Hopkins University
in that they have many programs related to eye diseases and would be able
to give an informed opinion and maybe give it some more thought.  There are
marked changes in glaucoma and in other diseases...maybe this is an
interesting
area in that glaucoma is a silent killer of sight and it goes undiagnosed
and untreated, so maybe the answer isn't quite IR but maybe anothe
wavelength might be of some help.
----- Original Message -----
From: Willem-Jan Markerink <w.j.markerink@xxxxx>
To: <infrared@xxxxx>
Sent: Monday, April 03, 2000 3:48 PM
Subject: Re: Infrared filter


> On  3 Apr 00 at 0:32, Marco Pauck wrote:
>
> > Willem-Jan Markerink wrote:
> > >
> > > On 28 Mar 00 at 18:14, Ibrahim PAMUK (Ank,IH) wrote:
> > >
> > > > The M&K 1000 or the Hoya RM100 is been compared and it seems that
they are
> > > > equal (http://www.irfilters.com/m&k_1000_filter.htm) . In WJ's
homepage
> > > > RG1000 was written to be similiar to RM900 or 094 of B+W that is
#87A. So
> > > > what is RM1000 and is B+W 094 still manufactured?
> > >
> > > My guess is that RM1000 has the transmission which RM90 *should* have
> > > had, based on it's equivalent-rating with #87A....#87A is definately
> > > opaque, but RM90 is not....to the eye it resembles a #89B or #88
> > > (#88A is where it starts being opaque to the human eye).
> >
> > I don't agree. Although I can see the filament of a light
> > bulb through my RM90, it is far stronger than the #88A!
>
> Mine definately isn't....I can look through the RM90 in sunlight,
> while I can't with #88A (#88 is the visible limit (shaded eye, very
> nice impression of the Wood-effekt btw), and RM90 doesn't
> even match that one).
>
> > To some details: I expose HIE as EI 25/15 with #88A but
> > EI 10/11 with RM90.
>
> Cor Breukel promised me a run on the spectrophotometer he has in his
> lab....once I have shipped all my exotic filters over to him, we'll let
> that machine speak it's neutral verdict....:-))
>
> --
> Bye,
>
> Willem-Jan Markerink
>
>
>       The desire to understand
> is sometimes far less intelligent than
>      the inability to understand
>
>
> <w.j.markerink@xxxxx>
> [note: 'a-one' & 'en-el'!]
> *
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