Archived posting to the Leica Users Group, 2011/04/28

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Subject: [Leica] Digital Pinhole for Micro 4/3
From: imagist3 at mac.com (George Lottermoser)
Date: Thu, 28 Apr 2011 09:39:25 -0500
References: <BANLkTi=1eVV4=r9Ec7OTL4r2Q5pX4-425Q@mail.gmail.com> <4DB8AB74.9020607@cox.net> <BANLkTi=WfGNcDWZbBxi5PyLqM=yc_Z9S4A@mail.gmail.com> <BANLkTikApUO4=AwX4Ww0pHCDNzsvzGcsdQ@mail.gmail.com>
 
On Apr 27, 2011, at 10:26 PM, Richard Man wrote:

> How does one calculate the effective length of a pinhole? Is the "body cap"
> distance the "normal" distance for most format? e.g. 50mm for SLR? And how
> is the size of image circle calculated?

The distance from the aperture to image plane determines effective "focal 
length"
or perhaps more accurately "field of view."

Effective aperture mathematics:

<http://pinhole.stanford.edu/pinholemath.htm>
<http://en.wikipedia.org/wiki/Pinhole_camera_model>

Regards,
George Lottermoser 
george at imagist.com
http://www.imagist.com
http://www.imagist.com/blog
http://www.linkedin.com/in/imagist
In reply to: Message from jayanand at gmail.com (Jayanand Govindaraj) ([Leica] Digital Pinhole for Micro 4/3)
Message from kcarney1 at cox.net (Ken Carney) ([Leica] Digital Pinhole for Micro 4/3)
Message from jayanand at gmail.com (Jayanand Govindaraj) ([Leica] Digital Pinhole for Micro 4/3)
Message from richard at imagecraft.com (Richard Man) ([Leica] Digital Pinhole for Micro 4/3)