(Fwd) RE: Some images using Fuji IS-1

[WJM]

------- Forwarded message follows -------
From:           Stan Patz <skp113@...>
To:             WILLEM-JAN MARKERINK <w.j.markerink@...>
Copies to:       <cameron@...>
Subject:         RE: Some images using Fuji IS-1
Date sent:       Mon, 3 Sep 2007 17:19:29 +0000

Dear WJ,
 
Please forward...Stan Patz  NYC Stan@...
www.PatzImaging.com



> From: cameron@...> To: infrared@...> Subject: RE: Some images using Fuji IS-1> Date: Mon, 3 Sep 2007 10:50:03 +0100> > > Some images using Fuji IS-1> I used to shoot 35mm and medium format IR film ages ago and went> through various rounds of "testing" digital cameras I've owned for
IR> sensitivity. I finally bought a Fuji IS-1 and think its potential is> amazing - so sensitive and easy to use.> > I bought it with the filter kit (B+W 093 and Kenko DR655) and> additionally bought B+W 091, 090, and 041 filters to try out. Here> are some of my first images shot earlier today in
NYC:> http://www.semblance.com/Digital_IR.html> > Would love to hear what you think. (and sorry for the many years of> completely silent reading...)> > -- Bill> Hi, well they are acceptable, well done!> with my Fuji IS-1 , I am> having problems with a light circle appearing at some lens settings
(longer> focal lengths makes it more visible), don't think> the lens is really designed for IR.> using 750nm filter, any suggestions on avoiding this?
 
To Cameron and the group,
 
I assume you are referring to a "hotspot" in the middle of a frame.
This is a know issue shooting IR and has to do with anti-reflection
coatings. Some of these coatings are less effective suppressing IR
bouncing around the lens innards - leading to some plus density, a
hotspot, in the center.
 
My converted Sony DSC-R1, which has a fixed zoom lens, shows this
hotspot more with the deeper filters, like the 87c, and less with a
25a. See if you can find a good combination of lens and filter for
your system. My solution has been to use a bandpass filter, an XDP,
sold to me by MaxMax.com. This filter only passes a narrow light band
around 750nm (my guess, no stats available). This filter lowers the
camera's sensitivity, but suppresses the hotspot. Anyhow, most of
these soft-edged spots can be corrected in digital post production.
 
Stan Patz  NYC Stan@... www.PatzImaging.com
 
 
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------- End of forwarded message -------
--                
Bye,

Willem-Jan Markerink

      The desire to understand
is sometimes far less intelligent than
     the inability to understand

<w.j.markerink@...>
[note: 'a-one' & 'en-el'!]

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