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Re: [ATM] Harry's 14-inch Sandwich Dob ready

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Subject: Re: [ATM] Harry's 14-inch Sandwich Dob ready
From: "Arjan te Marvelde" <arjan.te.marvelde@hetnet.nl>
Date: Wed, 24 May 2006 10:20:49 +0200
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Hello Stathis,

> See some pics as I ground the back flat against a 24" (absolutely
nessesarry
> for the large extrathin discs to prevend astigmatism):
> http://www.astrotreff.de/topic.asp?TOPIC_ID=39398
> click to second page as well to see all pictures

I'm surprised to see such an amount of un-flatness in floatglass; some spots
seem to be untouched after 1hr of 180 grit.
Can you estimate how large the P-V value is? From the float process I would
expect this value to differ between sides, do you also find this in
practise?

Arjan te Marvelde

PS: very nice scope!

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