Digital BW, The Print

Some sample images from the modified Canon Rebel XT:
http://www.pbase.com/scho/ir_rebel
The images were all captured in raw mode and then downsampled to  
small jpegs for web display.
The only problem I've had so far with this camera is internal  
reflections from the lens coatings which bounce off the IR filter  
creating faint "ghosting" artifacts in some images.  This is most  
pronounced with certain lenses, such as my 50mm f/1.4 and 100mm f/2.8  
but not a problem with other lenses.  It can also be eliminated by  
making slight changes in the camera orientation.  The red channel  
contains the strongest infrared effect and comes closest to  
replicating the "glow" of B&W prints made from HIE film negatives  
that had no anti-halation layer.

On Jul 21, 2005, at 3:27 PM, Carl Schofield wrote:

> Maxmax.com also does these conversions.  I just received an IR  
> dedicated Canon XT Rebel from maxmax.com that works very well.  An  
> internal 715 nm filter replaces the IR cut filter so viewing and  
> autofocus both function normally.  I just did some test shots  
> outside at ISO 100 with exposure of 1/200 sec @ f/11.  Auto  
> exposure works well if you first set an exposure compensation  
> factor of about -1.2 to -1.7 stops.  Sharp, clean images that  
> process easily using camera raw in CS 2.  I'll post a link to some  
> sample images, after I've had a chance to shoot something  
> worthwhile.  I used to shoot a lot of digital infrared when I had  
> an old Nikon 950 (see site below) so I'll probably revisit some of  
> those scenes with the IR Rebel.
> http://homepage.mac.com/scho/MySlideshow/slideset.html
>
> On Jul 20, 2005, at 5:56 PM, Gary Brown wrote:
>
>
>> My camera was converted by Hutech, www.sciencecenter.net/hutech
>> Yes can put an IR block filter in front of the lens for normal  
>> photography.
>> Hutech sells them. Starting this fall Hutech will offer  
>> conversions to
>> dedicated IR, for the Canon 20D and XT.
>>
>> Gary
>>
>> ----- Original Message -----
>> From: "Paul D. DeRocco" <pderocco@...>
>> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
>> Sent: Wednesday, July 20, 2005 9:03 AM
>> Subject: RE: [Digital BW] Digital contrast filtration
>>
>>
>>
>>
>>> From: Gary Brown
>>>
>>> My 20D has had the IR blocking filter removed and replaced with a  
>>> clear
>>> filter. This makes the camera very sensitive to IR. Even with an
>>> IR filter
>>> (usually a lee 87) which is opaque in front of the lens, on a  
>>> sunny day I
>>> can shoot 160th at F11 at ISO 100. It's not as easy to use as
>>> dedicated IR
>>> camera, because you have to have the camera on a tripod, compose  
>>> the shot
>>> then slip the filter in front of the lens. It may not be as
>>> convenient, but
>>> I have the flexibility to use different filters for different looks.
>>>
>>> If you want more details, e-mail me and I'll respond off list.
>>>
>>>
>>
>> This seems reasonably on-topic to keep on-list.
>>
>> Who did your IR mod? Do you have to screw on an IR block filter  
>> for normal
>> photography?
>>
>> --
>>
>> Ciao,               Paul D. DeRocco
>> Paul                mailto:pderocco@...
>>
>