[pure-silver] Re: Optical question
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 29 Feb 2008 22:14:17 -0800
----- Original Message -----
From: "Peter De Smidt" <pdesmidt@xxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, February 29, 2008 5:00 PM
Subject: [pure-silver] Optical question
Suppose one were to put a piece of 5mm thick acrylic
between a negative and an enlarging lens. Would the
piece of acrylic cause the distance needed to focus the
negative at a given size to change? If so, would there
need to be more or less extension between the negative and
the lens?
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