Yahoo Groups archive

Digital BW, The Print

Index last updated: 2026-04-28 22:56 UTC

Thread

Digital contrast filtration

Digital contrast filtration

2005-07-19 by Richard Smallfield

Hello,
I followed a thread on putting filters on your DSLR, but somehow lost the emails.

I have thought of putting orange or red filters on my D70 because selecting the red channel adds a huge amount of 
noise.

I have used a polarising filter to good effect, however.

Any thoughts on what approach works best on a DSLR would be appreciated.

thanks,
Richard
--
Portraiture and Location Photography
http://smallfield.vze.com
http://photos.smallfield.vze.com



   "There is more stupidity than hydrogen in the universe,
   and it has a longer shelf life." 
   --Frank Zappa

RE: [Digital BW] Digital contrast filtration

2005-07-19 by Paul Roark

Richard,

I used a Heliopan KR15 plus polarizer on a number of shots this last week.
In the few comparisons I've looked at the highlights and shadows were
slightly improved.  Of course, the effective speed also dropped -- almost 2
stops for the amber KR15 (Wratten 85b) and another 1 2/3 for the polarizer
(B+W circular).  (These German & Kodak Wratten [gel] filters are the only
ones I trust to be stacked without any significant image quality problems.)


This combination was also used where I needed slower speeds for water
motion.  So, I didn't need my ND filter at all.

The camera's meter adjusted appropriately to the filtration.  (I used a
Pentax spot meter also to learn what the camera's meter can and cannot do
well.)

I had previously used a yellow + magenta to get a more substantial dynamic
range increase.  However, I have not had time to do more with this.

Paul
www.PaulRoark.com
Show quoted textHide quoted text
> -----Original Message-----
> From: DigitalBlackandWhiteThePrint@yahoogroups.com
> [mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of Richard
> Smallfield
> Sent: Monday, July 18, 2005 5:02 PM
> To: Digital BW Print
> Subject: [Digital BW] Digital contrast filtration
> 
> Hello,
> I followed a thread on putting filters on your DSLR, but somehow lost the
> emails.
> 
> I have thought of putting orange or red filters on my D70 because
> selecting the red channel adds a huge amount of
> noise.
> 
> I have used a polarising filter to good effect, however.
> 
> Any thoughts on what approach works best on a DSLR would be appreciated.
> 
> thanks,
> Richard
> --
> Portraiture and Location Photography
> http://smallfield.vze.com
> http://photos.smallfield.vze.com
> 
> 
> 
>    "There is more stupidity than hydrogen in the universe,
>    and it has a longer shelf life."
>    --Frank Zappa
> 
> 
> 
> Please visit the Group Homepage to check the Files, and other resources as
> they are often being updated.
> 
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint
> 
> If you wish to receive no emails or just a daily digest, or you wish to
> unsubscribe, please edit your Membership preferences by visiting this same
> page.
> 
> Please follow these basic guidelines:
> - As threads develop, trim off excess portions of earlier messages to keep
> them short.
> - Good manners are required at all time. No personal attacks or flames.
> Hostile, aggressive or argumentative users may be removed from the
> membership without notice.
> - Keep your posts and threads related to the group topic of digital B&W
> printing. Users who persistently make off-topic posts may be removed from
> the membership.
> - By posting on this forum you agree to abide by the group rules and
> guidelines, and to abide by the actions and decisions of the group Owner
> and Moderators. See Group Topic, Rules and Guidelines in the Files
> section:
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/files/
> 
> BY PARTICIPATING IN AND/OR POSTING MESSAGES TO THE DIGITAL BW, THE PRINT
> YAHOO! GROUP YOU EXPRESSLY UNDERSTAND AND AGREE THAT THE OWNER AND
> MODERATORS OF DIGITAL BW, THE PRINT YAHOO GROUP SHALL NOT BE LIABLE TO
> YOU FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL OR
> EXEMPLARY DAMAGES, INCLUDING BUT NOT LIMITED TO, DAMAGES FOR LOSS OF
> PROFITS, GOODWILL, USE, DATA OR OTHER INTANGIBLE LOSSES (EVEN IF THE
> OWNER AND MODERATORS OF DIGITAL BW, THE PRINT YAHOO GROUP HAVE BEEN
> ADVISED OF THE POSSIBILITY OF SUCH DAMAGES), RESULTING FROM: (i) THE USE
> OR THE INABILITY TO USE THE DIGITAL BW, THE PRINT YAHOO GROUP; (ii)
> UNAUTHORIZED ACCESS TO OR ALTERATION OF YOUR TRANSMISSIONS OR DATA; (iii)
> STATEMENTS OR CONDUCT OF ANY THIRD PARTY ON THE DIGITAL BW, THE PRINT
> YAHOO GROUP; OR (iv) ANY OTHER MATTER RELATING TO THE DIGITAL BW, THE
> PRINT YAHOO GROUP.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
>

Re: [Digital BW] Digital contrast filtration

2005-07-19 by Gary Brown

Richard:

You might want try a 29 red filter. I use that filter on a 20D modified for 
IR. I set the parameters to B/W, but shoot in raw. The image you see on the 
LCD is B/W, giving you some idea what it looks like. The raw image still has 
to be converted to B/W. I use this combination when I want less of the IR 
effect.

Gary

www.pbase.com/garyallenbrown
Show quoted textHide quoted text
----- Original Message ----- 
From: "Richard Smallfield" <r.smallfield@...>
To: "Digital BW Print" <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Monday, July 18, 2005 6:01 PM
Subject: [Digital BW] Digital contrast filtration


Hello,
I followed a thread on putting filters on your DSLR, but somehow lost the 
emails.

I have thought of putting orange or red filters on my D70 because selecting 
the red channel adds a huge amount of
noise.

I have used a polarising filter to good effect, however.

Any thoughts on what approach works best on a DSLR would be appreciated.

thanks,
Richard
--
Portraiture and Location Photography
http://smallfield.vze.com
http://photos.smallfield.vze.com



   "There is more stupidity than hydrogen in the universe,
   and it has a longer shelf life."
   --Frank Zappa



Please visit the Group Homepage to check the Files, and other resources as 
they are often being updated.

http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint

If you wish to receive no emails or just a daily digest, or you wish to 
unsubscribe, please edit your Membership preferences by visiting this same 
page.

Please follow these basic guidelines:
- As threads develop, trim off excess portions of earlier messages to keep 
them short.
- Good manners are required at all time. No personal attacks or flames. 
Hostile, aggressive or argumentative users may be removed from the 
membership without notice.
- Keep your posts and threads related to the group topic of digital B&W 
printing. Users who persistently make off-topic posts may be removed from 
the membership.
- By posting on this forum you agree to abide by the group rules and 
guidelines, and to abide by the actions and decisions of the group Owner and 
Moderators. See "Group Topic, Rules and Guidelines" in the Files section:
http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/files/

BY PARTICIPATING IN AND/OR POSTING MESSAGES TO THE DIGITAL BW, THE PRINT 
YAHOO! GROUP YOU EXPRESSLY UNDERSTAND AND AGREE THAT THE "OWNER" AND 
"MODERATORS" OF DIGITAL BW, THE PRINT YAHOO GROUP SHALL NOT BE LIABLE TO YOU 
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL OR EXEMPLARY 
DAMAGES, INCLUDING BUT NOT LIMITED TO, DAMAGES FOR LOSS OF PROFITS, 
GOODWILL, USE, DATA OR OTHER INTANGIBLE LOSSES (EVEN IF THE  "OWNER" AND 
"MODERATORS" OF DIGITAL BW, THE PRINT YAHOO GROUP HAVE BEEN ADVISED OF THE 
POSSIBILITY OF SUCH DAMAGES), RESULTING FROM: (i) THE USE OR THE INABILITY 
TO USE THE DIGITAL BW, THE PRINT YAHOO GROUP; (ii) UNAUTHORIZED ACCESS TO OR 
ALTERATION OF YOUR TRANSMISSIONS OR DATA; (iii) STATEMENTS OR CONDUCT OF ANY 
THIRD PARTY ON THE DIGITAL BW, THE PRINT YAHOO GROUP; OR (iv) ANY OTHER 
MATTER RELATING TO THE DIGITAL BW, THE PRINT YAHOO GROUP.

Yahoo! Groups Links

Re: [Digital BW] Digital contrast filtration

2005-07-20 by colingruk

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Gary Brown" 
<baffin@c...> wrote:
> Richard:
> 
> You might want try a 29 red filter. I use that filter on a 20D 
modified for 
> IR.

Gary,  Could you please explain?  What filter is used in the IR 
modification of your D20?

Colin

Re: [Digital BW] Digital contrast filtration

2005-07-20 by 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.


Gary
baffin@...
www.pbase.com/garyallenbrown
Show quoted textHide quoted text
----- Original Message ----- 
From: "colingruk" <cconway@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Tuesday, July 19, 2005 10:56 PM
Subject: Re: [Digital BW] Digital contrast filtration


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Gary Brown"
<baffin@c...> wrote:
> Richard:
>
> You might want try a 29 red filter. I use that filter on a 20D
modified for
> IR.

Gary,  Could you please explain?  What filter is used in the IR
modification of your D20?

Colin





Please visit the Group Homepage to check the Files, and other resources as 
they are often being updated.

http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint

If you wish to receive no emails or just a daily digest, or you wish to 
unsubscribe, please edit your Membership preferences by visiting this same 
page.

Please follow these basic guidelines:
- As threads develop, trim off excess portions of earlier messages to keep 
them short.
- Good manners are required at all time. No personal attacks or flames. 
Hostile, aggressive or argumentative users may be removed from the 
membership without notice.
- Keep your posts and threads related to the group topic of digital B&W 
printing. Users who persistently make off-topic posts may be removed from 
the membership.
- By posting on this forum you agree to abide by the group rules and 
guidelines, and to abide by the actions and decisions of the group Owner and 
Moderators. See "Group Topic, Rules and Guidelines" in the Files section:
http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/files/

BY PARTICIPATING IN AND/OR POSTING MESSAGES TO THE DIGITAL BW, THE PRINT 
YAHOO! GROUP YOU EXPRESSLY UNDERSTAND AND AGREE THAT THE "OWNER" AND 
"MODERATORS" OF DIGITAL BW, THE PRINT YAHOO GROUP SHALL NOT BE LIABLE TO YOU 
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL OR EXEMPLARY 
DAMAGES, INCLUDING BUT NOT LIMITED TO, DAMAGES FOR LOSS OF PROFITS, 
GOODWILL, USE, DATA OR OTHER INTANGIBLE LOSSES (EVEN IF THE  "OWNER" AND 
"MODERATORS" OF DIGITAL BW, THE PRINT YAHOO GROUP HAVE BEEN ADVISED OF THE 
POSSIBILITY OF SUCH DAMAGES), RESULTING FROM: (i) THE USE OR THE INABILITY 
TO USE THE DIGITAL BW, THE PRINT YAHOO GROUP; (ii) UNAUTHORIZED ACCESS TO OR 
ALTERATION OF YOUR TRANSMISSIONS OR DATA; (iii) STATEMENTS OR CONDUCT OF ANY 
THIRD PARTY ON THE DIGITAL BW, THE PRINT YAHOO GROUP; OR (iv) ANY OTHER 
MATTER RELATING TO THE DIGITAL BW, THE PRINT YAHOO GROUP.

Yahoo! Groups Links

RE: [Digital BW] Digital contrast filtration

2005-07-20 by Paul D. DeRocco

> 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@...

Re: [Digital BW] Digital contrast filtration

2005-07-20 by Gary Brown

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
Show quoted textHide quoted text
----- 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@...



Please visit the Group Homepage to check the Files, and other resources as 
they are often being updated.

http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint

If you wish to receive no emails or just a daily digest, or you wish to 
unsubscribe, please edit your Membership preferences by visiting this same 
page.

Please follow these basic guidelines:
- As threads develop, trim off excess portions of earlier messages to keep 
them short.
- Good manners are required at all time. No personal attacks or flames. 
Hostile, aggressive or argumentative users may be removed from the 
membership without notice.
- Keep your posts and threads related to the group topic of digital B&W 
printing. Users who persistently make off-topic posts may be removed from 
the membership.
- By posting on this forum you agree to abide by the group rules and 
guidelines, and to abide by the actions and decisions of the group Owner and 
Moderators. See "Group Topic, Rules and Guidelines" in the Files section:
http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint/files/

BY PARTICIPATING IN AND/OR POSTING MESSAGES TO THE DIGITAL BW, THE PRINT 
YAHOO! GROUP YOU EXPRESSLY UNDERSTAND AND AGREE THAT THE "OWNER" AND 
"MODERATORS" OF DIGITAL BW, THE PRINT YAHOO GROUP SHALL NOT BE LIABLE TO YOU 
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL OR EXEMPLARY 
DAMAGES, INCLUDING BUT NOT LIMITED TO, DAMAGES FOR LOSS OF PROFITS, 
GOODWILL, USE, DATA OR OTHER INTANGIBLE LOSSES (EVEN IF THE  "OWNER" AND 
"MODERATORS" OF DIGITAL BW, THE PRINT YAHOO GROUP HAVE BEEN ADVISED OF THE 
POSSIBILITY OF SUCH DAMAGES), RESULTING FROM: (i) THE USE OR THE INABILITY 
TO USE THE DIGITAL BW, THE PRINT YAHOO GROUP; (ii) UNAUTHORIZED ACCESS TO OR 
ALTERATION OF YOUR TRANSMISSIONS OR DATA; (iii) STATEMENTS OR CONDUCT OF ANY 
THIRD PARTY ON THE DIGITAL BW, THE PRINT YAHOO GROUP; OR (iv) ANY OTHER 
MATTER RELATING TO THE DIGITAL BW, THE PRINT YAHOO GROUP.

Yahoo! Groups Links

Re: [Digital BW] Digital contrast filtration

2005-07-21 by colingruk

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Gary Brown" 
<baffin@c...> 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
>
Gary, I now understand why you use the 29 Filter.  I had a D30 which 
was modified by http://www.irdigital.net/ but this proved to be a 
disaster.  I sent that camera to Roger Salmon in the UK 
james.salmon@... and he did a great job.  He adjusts the 
focus of the camera to accommodate the filter used.  I was so 
impressed I p'ex'd the D30 for a D60 which has a Schott RG780 filter, 
which is equivalent to the Wratten 87.  I'm thrilled. Because I wish 
him well, and want other list members not to be disappointed with 
irdigital, I post Roger's contact details

His business is growing with many from the US choosing to have him 
modify their cameras.

I shoot landscapes and figure studies and can shoot hand held, with 
confidence on focus issues at any aperture as with a normal DSLR.

Colin

Re: [Digital BW] Digital contrast filtration

2005-07-21 by Carl Schofield

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
Show quoted textHide quoted text
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@...
>

Re: [Digital BW] Digital contrast filtration

2005-07-25 by Carl Schofield

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.
Show quoted textHide quoted text
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@...
>>
>

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.