Re: Fun!!! Large Format Lens Question. Low tech answer

From: Richard Knoppow ^lt;[email protected]>
Date: 02/26/05-12:33:40 AM Z
Message-id: <000d01c51bcd$1f2744c0$7e695142@VALUED20606295>

----- Original Message -----
From: "Janet Neuhauser" <>
To: <>
Sent: Friday, February 25, 2005 8:31 PM
Subject: Re: Fun!!! Large Format Lens Question. Low tech

>> What would be real fun is to have a on line
>> competition or on
>> line exhibit of images using home made simple lenses or
>> low tech lenses..
>> These lenses take images that really lends themselves to
>> alternative
>> processes..... The competition could be the process of
>> your choice
>> submitting a good clear digital image of your hand
>> crafted lens along
>> with a taken with it using alt processes.............
>> The competition
>> should probably exclude pinhole
> What would happen if you put the lenses over a pinhole?
  There is a relationship between the position of a stop and
the performance of a lens. In a very simple lens the
introduction of a stop will reduce the spherical aberration
and coma and reduce the effects of some other aberrations.
Box cameras used simple meniscus lenses. A meniscus lens is
one where both surfaces are curved the same way. There is an
optimum shape for this kind of lens for best correction.
When its combined with a stop at the right distance the
correction is even better. Such simple lenses are capable of
surprizingly good images.

Richard Knoppow
Los Angeles, CA, USA 
Received on Sat Feb 26 00:34:02 2005

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