Re: Infrared filter

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

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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