Re: Infrared filter

[Marco Pauck <pauck@xxxxxx>]

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!

To some details: I expose HIE as EI 25/15 with #88A but
EI 10/11 with RM90.

	Marco
--
Marco Pauck -- marco@xxxxxxxx -- http://www.pauck.de/marco/
For every complex problem, there is a solution that is simple,
neat, and wrong.  -- H. L. Mencken
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