Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
11-07-2014, 11:54 PM - 7 Likes   #1
Pentaxian




Join Date: Dec 2012
Photos: Gallery
Posts: 602
Infrared fun with Pentax K100D – a (mini) “how-to”

I have really much fun doing landscape photos using my K100D in infra red. I saw some interest on the topic when I posted my IR images last days, so I’ll try to give some most important info on this. More exhaustive information on IR photography can be easily found on the internet.




Camera and filter

K100D works good for IR even without any kind of conversion or modification. You just need to buy the IR filter. I tested the one made by Hoya and it seems to be really good.

Proper lenses

For me older lenses are better compared to modern ones. The normal distance scale if off for the IR photography and the old lenses have markings for IR being usually red line/red dot below the distance scale. For some landscape shots it is usually good enough to put the infinity mark against this (an close down the aperture).

Lenses that I tested and are OK for IR are: SMC Pentax A - 50/1,7, SMC - Pentax M - 50/1,7, SMC - Pentax M - 40/2,8 and Rikenon 50/2 (the last one seems to have best contrast which is important for IR with K100D - you can expect quite high noise if you make strong image edition).

Some say that also kit lens (18-55) is a good one for infrared, but for my copy this is not true. It was possible to use AF with the kit lens, which was really handy, but I got some strange looking halo and softness effects on my photos. Moreover it seems to be the problem for many modern lenses which has complicated designs.

White balance

The only WB setting that works is manual WB. Before adjusting WB you have to set M mode and adjust shutter speed – 1/10 s should work, and aperture if the lens has no aperture ring. To adjust this you have to go to Fn – White Balance – Manual. Then you have to point K100D against grass or eventually any other vegetation. Just set smaller aperture and click “adjust” (and try as long as you have with other exposure settings if camera declares error).
I usually use one WB setting for many shots. Even if I forget to adjust this and use one from the previous day it works usually – at least for monochrome pictures.

Good subjects

Vegetation and sky look specially good in IR, so this is funny way to photograph some landscapes. What is also good the best time to make the IR photos is around noon – when the light is usually not cooperative for this type of shots.
But also modern architecture with some sky and vegetation works, this is the case of water also.

Expose “to the right”

I set shutter speed manually checking the results and the histogram on the LCD. I usually use ISO 400, however with plenty of light 200 would be better (noise is the problem while dynamic range is limited). It is possible to make some photos without tripod (but viewfinder is black) – you can try this with plenty of light at 1/10s an f 5,6. But typical exposure values are ¼ s – 1 s at f8. To get good quality results I tend to “exposure to the right” – the histogram graph should be on the right side (not in the middle) but without overexposing. Use RAW files!
Mentioned shutter speeds are for central part of the Europe. I would expect that even in Southern Europe this should be shorther, not mentioning Australia.
So, just put your camera on tripod, find the right subject, compose, put the IR filter and have fun!

Post processing

I have to say that I do not make really intensive post processing on most images. Maybe I’m too lazy, but I’m not trying to squeeze good RGB images from my RAW’s. I stick to monochrome versions.
For me It is usually enough to adjust the exposure, convert to monochrome and then adjust the contrast and “stretch” the histogram

11-08-2014, 12:30 AM   #2
Pentaxian
LensBeginner's Avatar

Join Date: Sep 2014
Photos: Albums
Posts: 2,623
An interesting tutorial, I've always wanted to try this sooner or later... just need to buy the filter... >_<

Last edited by LensBeginner; 11-08-2014 at 01:18 AM.
11-08-2014, 12:47 AM   #3
Pentaxian




Join Date: Dec 2012
Photos: Gallery
Posts: 602
Original Poster
I suppose all 6 MP Pentaxes can be used exactly as K 100D, but have no possibility to check this.
11-08-2014, 10:21 AM   #4
Pentaxian




Join Date: Dec 2012
Photos: Gallery
Posts: 602
Original Poster
Maybe I should add some examples - they were posted before, but in many places on the Forum.








11-08-2014, 01:31 PM   #5
Inactive Account




Join Date: Feb 2014
Posts: 1
I've gotten some interesting results with my K100D shooting through a Wratten 18A filter, which passes both UV and IR light, while blocking visible light. I only took a few test images, but green foliage did indeed seem much brighter than normal. I'm assuming that was from the IR the filter was transmitting. I need to try this again, and do more extensive testing. I was just using my kit lens, and the autofocus seemed to work pretty well, at least on a sunny day.
11-08-2014, 02:45 PM   #6
Veteran Member
flaviopetrone's Avatar

Join Date: Aug 2014
Location: Reggio Emilia
Photos: Albums
Posts: 1,152
Thank you for the tutorial. I have already read few articles about the infrared, I will try it with a filter, even if the viewfinder will be black...
11-28-2014, 11:21 AM   #7
New Member




Join Date: Oct 2014
Posts: 9
Thank you for the information. I will do some research if K10d is equally susceptible to IR as K100d... Did anyone tried that?
01-08-2015, 02:07 PM - 1 Like   #8
Site Supporter
Site Supporter
Jean Poitiers's Avatar

Join Date: Apr 2011
Location: Lost in translation ...
Photos: Gallery | Albums
Posts: 16,583
Thanks for the info !!! Thinking hard about this with my K110D. Salut, J

01-08-2015, 08:37 PM   #9
Pentaxian




Join Date: Sep 2009
Location: Texas
Photos: Gallery
Posts: 3,430
I wonder how well this will work with a K2000 (K-m).
04-17-2015, 08:37 AM   #10
Inactive Account




Join Date: Mar 2009
Location: Fort Erie Ontario Canada
Posts: 18
QuoteOriginally posted by Piotrek K Quote
I have really much fun doing landscape photos using my K100D in infra red. I saw some interest on the topic when I posted my IR images last days, so I’ll try to give some most important info on this. More exhaustive information on IR photography can be easily found on the internet.




Camera and filter

K100D works good for IR even without any kind of conversion or modification. You just need to buy the IR filter. I tested the one made by Hoya and it seems to be really good.

Proper lenses

For me older lenses are better compared to modern ones. The normal distance scale if off for the IR photography and the old lenses have markings for IR being usually red line/red dot below the distance scale. For some landscape shots it is usually good enough to put the infinity mark against this (an close down the aperture).

Lenses that I tested and are OK for IR are: SMC Pentax A - 50/1,7, SMC - Pentax M - 50/1,7, SMC - Pentax M - 40/2,8 and Rikenon 50/2 (the last one seems to have best contrast which is important for IR with K100D - you can expect quite high noise if you make strong image edition).

Some say that also kit lens (18-55) is a good one for infrared, but for my copy this is not true. It was possible to use AF with the kit lens, which was really handy, but I got some strange looking halo and softness effects on my photos. Moreover it seems to be the problem for many modern lenses which has complicated designs.

White balance

The only WB setting that works is manual WB. Before adjusting WB you have to set M mode and adjust shutter speed – 1/10 s should work, and aperture if the lens has no aperture ring. To adjust this you have to go to Fn – White Balance – Manual. Then you have to point K100D against grass or eventually any other vegetation. Just set smaller aperture and click “adjust” (and try as long as you have with other exposure settings if camera declares error).
I usually use one WB setting for many shots. Even if I forget to adjust this and use one from the previous day it works usually – at least for monochrome pictures.

Good subjects

Vegetation and sky look specially good in IR, so this is funny way to photograph some landscapes. What is also good the best time to make the IR photos is around noon – when the light is usually not cooperative for this type of shots.
But also modern architecture with some sky and vegetation works, this is the case of water also.

Expose “to the right”

I set shutter speed manually checking the results and the histogram on the LCD. I usually use ISO 400, however with plenty of light 200 would be better (noise is the problem while dynamic range is limited). It is possible to make some photos without tripod (but viewfinder is black) – you can try this with plenty of light at 1/10s an f 5,6. But typical exposure values are ¼ s – 1 s at f8. To get good quality results I tend to “exposure to the right” – the histogram graph should be on the right side (not in the middle) but without overexposing. Use RAW files!
Mentioned shutter speeds are for central part of the Europe. I would expect that even in Southern Europe this should be shorther, not mentioning Australia.
So, just put your camera on tripod, find the right subject, compose, put the IR filter and have fun!

Post processing

I have to say that I do not make really intensive post processing on most images. Maybe I’m too lazy, but I’m not trying to squeeze good RGB images from my RAW’s. I stick to monochrome versions.
For me It is usually enough to adjust the exposure, convert to monochrome and then adjust the contrast and “stretch” the histogram
Hi are your examples with an un-modified K100d? They look great!. I just picked up a k100 and can't even get close to what you are showning.... I'll keep trying...
04-17-2015, 09:28 PM   #11
Loyal Site Supporter
Loyal Site Supporter




Join Date: Dec 2006
Location: Frazier Park, CA
Photos: Gallery
Posts: 835
I've had good luck using the DA35 macro and using AF with the K100. I just wish later cameras could be as sensitive to IR light. It's fun playing around with this, I should do it some more.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
aperture, camera, infrared, ir, k100d, lens, lenses, pentax, photography, photos, shutter, smc, wb
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
How to use a Pentax AF-360FGZ with Pocketwizard Plus 3 Neel1 Flashes, Lighting, and Studio 4 08-14-2014 05:06 PM
How a Broken Tripod Leads to a K100D Super! dubiousone Pentax DSLR Discussion 14 10-07-2013 07:42 AM
How to power 540FGZ flash with Alienbees Vagabond mini II portable power? shadowbecomeswhite Flashes, Lighting, and Studio 2 07-25-2011 07:17 PM
Need "how to" help - K100d with SMC A lens Papersniper Pentax DSLR Discussion 15 11-01-2007 02:05 PM
how to use prime lens with K100D? WMBP Pentax DSLR Discussion 4 01-17-2007 05:43 PM



All times are GMT -7. The time now is 08:00 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top