Re: [ATM] Baffles

[johncdeitz@comcast.net]

Black velvet works well BUT 1) difficult to handle and apply to inside of tube (mounted on paper first, 2) traps air, likely of different temperature, and prohibits (I suspect) good airflow. How are you measureing effectiveness of the blackness?
John
 -------------- Original message ----------------------
From: Dominic-Luc Webb <dlwebb@canit.se>
> 
> On Fri, 16 Jun 2006, Andy Saulietis wrote:
> 
> > For my own scopes, I use Krylon 1602 Ultra Flat Black spray paint.
> > Works great if
> > applied just thick enough to cover the surface. Additional coats
> > actually increase the
> > reflectivity.
> 
> This is my experience as well. I wonder, have you ever used velvet
> or velcro, etc? I tried artificial lawn, painted with this paint.
> Really worked! I suspect it was due partly to lots of surface area.
> Of course, the plastic dries up and becomes brittle, which contributes
> huge amounts of dust and particles that have to be cleaned, but I
> was pleased with the baffling performance. I have also tried mixing
> particles into black paint to keep the surface rough.
> 
> The blackest, most non-reflectice material I have worked with is coal
> rubbed onto a rough cardboard surface. It is a real mess to work with,
> so I do not think this will ever be popular.
> 
> Dominic
> 
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