Archived posting to the Leica Users Group, 2007/12/15

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Subject: [Leica] Consensus (? on LUG) on IR filters on M8
From: red735i at earthlink.net (Frank Filippone)
Date: Sat Dec 15 17:44:16 2007
References: <002e01c83d7b$d40617e0$6400a8c0@corp.nortel.com> <43947DDB653551B8C85FD332@hindolveston.reid.org> <00c601c83db1$fe075be0$fa1613a0$@net> <DCEF0A99-624F-49ED-B01D-9039051D064F@mac.com> <200712151658.AHW98884@rg5.comporium.net> <009601c83f47$ef46c680$cdd45380$@net> <CDC89F18-B7BD-4B5A-937B-B50205DE66FF@mac.com>

George... I read the description, but do not see the mention of the
removable sensor IR filter....  I then pulled the Kodak user manual  and
found it listed there....

Quoted from that user Manual...
"For your images to be sharp and in focus, you must use either an IR filter
or an anti-aliasing filter."
"A removable IR filter (page 40) is included with the DCS 645. This filter,
which is installed in front of the imager, filters out infrared light and
helps protect the imager's coverglass."
"You can replace the IR filter with an anti-aliasing filter which can be
purchased from your Kodak equipment dealer. The filter performs the IR
filter functions and helps reduce aliasing at certain focal distances."

No where does Kodak tell you to remove the IR filter completely or to
replace it with something else, like plain glass or something unknown to me
so that the focus is correct.

My conclusion, based upon the Kodak User manual, is that the IR filter is
always present in this camera.......to " filter out infrared light".


Frank Filippone
red735i@earthlink.net


Why do you suppose this back
<http://www.popphoto.com/cameraaccessories/733/kodak-dcs-pro- 
back-645h-the-ultimate-snap-on-tool-page2.html>
has a removable IR filter and optional IR/AA filter?

Regards,
George Lottermoser



> There is no proof that this is true.  We are told it, we believe  
> it, but no
> one has seen the same sensor in the same camera with and without the
> "proper" glass interference filter in front of the sensor......




In reply to: Message from vick.ko at sympatico.ca (Vick Ko) ([Leica] Consensus (? on LUG) on IR filters on M8)
Message from reid at mejac.palo-alto.ca.us (Brian Reid) ([Leica] Consensus (? on LUG) on IR filters on M8)
Message from red735i at earthlink.net (Frank Filippone) ([Leica] Consensus (? on LUG) on IR filters on M8)
Message from imagist3 at mac.com (Lottermoser George) ([Leica] Consensus (? on LUG) on IR filters on M8)
Message from images at comporium.net (Tina Manley) ([Leica] Consensus (? on LUG) on IR filters on M8)
Message from red735i at earthlink.net (Frank Filippone) ([Leica] Consensus (? on LUG) on IR filters on M8)
Message from imagist3 at mac.com (Lottermoser George) ([Leica] Consensus (? on LUG) on IR filters on M8)