From: Milton Aupperle <milton@outcastsoft.com>

Date: January 8, 2010 9:09:07 AM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] solar beginnings...

Hi Mark;

He used a 6 inch hole for his 200 mm aperture scope, which is probably big enough for your 235 mm scope.

Quote from the web site.

"First I took two sheets of heavy weight paper (size A4) and with a compass I drew a circle of 6 inches on the two sheets"

HTH..

Milton Aupperle

On 7-Jan-10, at 9:19 PM, Mark Gaffney wrote:

Hi Alan, Ray & others,

My Baader solar film (1 foot square) is I believe in the mail

somewhere & I now have a 280mm cake making spring form as per the

following site & some cardboard. Here`s the site I`m using for advice

on the construction of my filter; http://www.backyard-astro.com/equipment/filters/baader.html

I can`t find an email link to the author so am asking here. How much

of the aperture of my C9.25 can I use i.e. how big a circle should I

be cutting in the cardboard? The spring form does seems to fit the

scope & & I`d be using a reducer...

Mark.