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#1
July 18th 06, 04:10 AM
posted to sci.astro.amateur
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Stopping down an 80mm to 70mm
A neat little trick to stop down an 80mm to 70mm is to get a dixie cup lid
that doesn't have the fold back mouthpiece but justa small hole to drink from. If you use an exacto knife you can cut the inner circle out and it is exactly 70mm. 
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