Re: (ATMoB:Discuss) Refractor Objective retaining ring tool

• To: "David Aucoin" <graywwoolf ^a^ msn dot com>, "ATMOB" <atmob-discuss ^a^ atmob daht org>
• Subject: Re: (ATMoB:Discuss) Refractor Objective retaining ring tool
• From: Paul Valleli <valleli ^a^ rcn dot com>
• Date: Wed, 09 Jan 2002 21:40:41 -0500
• Delivered-To: atmob-discuss-mhonarc ^a^ atmob daht org
• Delivered-To: atmob-discuss ^a^ atmob daht org
• In-Reply-To: <OE116ILoygXLsxpTljB00035f4a ^a^ hotmail dot com>
• Sender: owner-atmob-discuss ^a^ atmob daht org

At 01:42 PM 1/7/2002 -0500, David Aucoin wrote:
>Do we have up at the clubhouse a tool to remove the retaining ring on 
>refractor objectives? I need to loosen mine on my 4" because I am getting 
>traingle diffraction rings and was told the retaining ring was too tight.
>
>Any information would be helpful.
>
>Dave Aucoin
>
>Climb high, Climb far, Your aim the sky, Your goal the stars
>
>Norwood, MA.
>42.18870 North Latitude,
>71.20926 West Longitude

Dave,
I never saw a retainer ring tool at the workshop and there are many 
variations of slots and blind holes.

In theory, a too-tight ring will distort both sides of each lens and equal 
amount and is therefore self-compensating. In practice, I have seen 
astigmatic irregularity that was clearly caused by the ring being too tight.

Edmund Scientific has a number of tool configurations but they cost about 
$34 each.
If you can stop by work some time,we can help.
Paul

• (ATMoB:Discuss) Refractor Objective retaining ring tool
• From: "David Aucoin" <graywwoolf a t msn.com>

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