(Fwd) RE: IS-1 various filters and IR sharpness

[WJM]

------- Forwarded message follows -------
From:           Stan Patz <skp113@...>
To:             WILLEM-JAN MARKERINK <w.j.markerink@...>
Copies to:       <josh@...>
Subject:         RE: IS-1 various filters and IR sharpness
Date sent:       Fri, 27 Jul 2007 21:58:41 +0000

Dear WJ,

Please post this to the IR group. I was surprised that no one had any
suggestions concerning my Hotmail/plain text problem.

********************

To Josh and the group,

Thanks for the comparative report on filtration for your digital IR
system, I found it quite informative.

I have a larger question for you about IR sharpness - and for the
whole group. Put aside the ethereal glow of HIE, let's talk about
resolution. In my history, I have shot 8x10, 4x5, MF 120 and 35mm IR
film from at least 3 manufacturers. I do not think I have ever seen a
truly sharp IR photo.

Now I am shooting digital IR on a converted Sony DSC-R1 and getting
similar results. Nothing is very sharp. In addition, the Sony makes
flat files which need to be boosted considerably to produce a
pleasant image. When I look closely at a one of my IR BWs, it has
noise and artifacts roughly equivalent to the grain of HIE.

My theory is that all my optical systems have been optimized for the
visual spectrum. None of my fine lenses past or present has the
ability to critically focus wavelengths going into the IR band. Is
there any science to back this up?
Stan Patz  NYC Stan@... www.PatzImaging.com



> Date: Thu, 26 Jul 2007 20:55:47 -0700> From: josh@...> To: infrared@...> Subject: IS-1 various filters> > I've been trying various different filters on my IS-1 lately, and> finally got around to doing a brief web writeup on the camera with some> sample exposures.> >
http://home.comcast.net/~joshputnam/photo/Fuji_IS1.html includes one> scene re-shot with filters ranging from B+W041 orange to 950nm IR, and> two quick samples of color shots with red & blue swapped.> > I'm pleasantly surprised with the results I get with the orange filter. > It's not the same
color scheme as false-color IR film, but it does > differentiate various types of foliage.> > --
_________________________________________________________________
Don't get caught with egg on your face. Play Chicktionary!  
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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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[Keith Zimmerman]

Stan,

I have been working with a converted 5mp Nikon prosumer digital camera (R72
swapped for IR blocking filter) and have to agree with you about the lack of
sharp focus.  I think that the inherent focus shift that has always been
prevelant in IR still exists in digital and the microcode is not designed to
address it.

Perhaps if someone rewrote the microcode to address IR shift, it might be
possible to get sharp images.

Keith Zimmerman
Digital Black & White Infrared
http://kzarts.com

> -----Original Message-----
> From: owner-infrared@... [mailto:owner-infrared@...]On Behalf Of
> Willem-Jan Markerink
> Sent: Friday, July 27, 2007 5:03 PM
> To: infrared@...
> Subject: (Fwd) RE: IS-1 various filters and IR sharpness
>
>
>
> ------- Forwarded message follows -------
> From:           Stan Patz <skp113@...>
> To:             WILLEM-JAN MARKERINK <w.j.markerink@...>
> Copies to:       <josh@...>
> Subject:         RE: IS-1 various filters and IR sharpness
> Date sent:       Fri, 27 Jul 2007 21:58:41 +0000
>
> Dear WJ,
>
> Please post this to the IR group. I was surprised that no one had any
> suggestions concerning my Hotmail/plain text problem.
>
> ********************
>
> To Josh and the group,
>
> Thanks for the comparative report on filtration for your digital IR
> system, I found it quite informative.
>
> I have a larger question for you about IR sharpness - and for the
> whole group. Put aside the ethereal glow of HIE, let's talk about
> resolution. In my history, I have shot 8x10, 4x5, MF 120 and 35mm IR
> film from at least 3 manufacturers. I do not think I have ever seen a
> truly sharp IR photo.
>
> Now I am shooting digital IR on a converted Sony DSC-R1 and getting
> similar results. Nothing is very sharp. In addition, the Sony makes
> flat files which need to be boosted considerably to produce a
> pleasant image. When I look closely at a one of my IR BWs, it has
> noise and artifacts roughly equivalent to the grain of HIE.
>
> My theory is that all my optical systems have been optimized for the
> visual spectrum. None of my fine lenses past or present has the
> ability to critically focus wavelengths going into the IR band. Is
> there any science to back this up?
> Stan Patz  NYC Stan@... www.PatzImaging.com
>
>
>
> > Date: Thu, 26 Jul 2007 20:55:47 -0700> From: josh@...>
> To: infrared@...> Subject: IS-1 various filters> > I've been
> trying various different filters on my IS-1 lately, and> finally
> got around to doing a brief web writeup on the camera with some>
> sample exposures.> >
> http://home.comcast.net/~joshputnam/photo/Fuji_IS1.html includes
> one> scene re-shot with filters ranging from B+W041 orange to
> 950nm IR, and> two quick samples of color shots with red & blue
> swapped.> > I'm pleasantly surprised with the results I get with
> the orange filter. > It's not the same
> color scheme as false-color IR film, but it does > differentiate
> various types of foliage.> > --
> _________________________________________________________________
> Don't get caught with egg on your face. Play Chicktionary!  
> http://club.live.com/chicktionary.aspx?icid=chick_wlmailtextlink
> ------- 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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*----------------------------------------------------*
*   For the IR-FAQ, IR-Gallery and heaps of links:   *
*  http://www.a1.nl/phomepag/markerink/mainpage.htm  *
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