Re: [APML] ST-4 question

["Kevin Wigell" <kwemail@twcny.rr.com>]

An O-ring and a desiccant ring are not the same thing. An O-ring is a rubber-like ring that looks something like a tiny tire inner tube. It's used as a seal. A desiccant ring is flat and made out of, well, I would imagine some sort of desiccant material. It's job is to absorb moisture from the air. The purpose of the O-ring is to prevent outside air from infiltrating which would exhaust the desiccant very quickly. While the O-ring is likely available from some other supplier (and can be custom made fairly easily), apparently the desiccant ring is something made only by SBIG.

Kevin Wigell
www.kwastronomy.com

----- Original Message ----- 
From: "Alan Voetsch" <alanv12952@yahoo.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Monday, September 06, 2004 17:37
Subject: Re: [APML] ST-4 question


> --- RBissinger@aol.com wrote:
>> What are the dimensions of the dessicant ring, and what is it made
>> of?  There are many suppliers of O-rings; I'm wondering if there
>> isn't a suitable replacement out there somewhere besides SBIG.
> 
> OD is 1.25"
> ID is just over 7/8"
> 
> it is 3/32", or just a hair over, in thickness
> 
> I'm not qualified to guess at the material it's made of.
> 
> Alan

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