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08-16-2007, 12:25 AM   #1
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IR photography with the K10D

G'day all

I've been reading about IR photography on this forum and I gather that it's possible with the K100 but not so good on the K10D. The images on display here and there (difficult to search for them as the search won't search on "IR" as it's too short, and it seems that's the term most people use, not "infra-red" etc) are fascinating - I'd love to experiment with my K10d.

Could anyone answer a few questions please:

1. Is it worth trying at all on a K10D, or would I just be wasting money on the filter?

2. If it is worth trying, can anyone make any recommendations as to which filter is best?

3. What else do I need to know???

Thanks!

08-16-2007, 12:35 AM   #2
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Not a waste of time of effort.

K10D, Pentax smc DA 16-45 f4, 26mm, f8, 153s, 100 ISO


K10D, Pentax smc DA 16-45 f4, 16mm, f8, 136s, 100 ISO


Pentax K10D, Pentax smc DA 16-45 f4, 16mm, f8, 121s, 100 ISO


Pentax K10D, Pentax smc DA 16-45 f4, 16mm, f8, 83s, 100 ISO


Pentax K10D, Pentax smc DA 16-45 f4, 20mm, f8, 123s, 100 ISO


Pentax K10D, Pentax smc DA 16-45 f4, 19mm, f8, 122s, 100 ISO


Pentax K10D, Pentax smc DA 16-45 f4, 16mm, f8, 122s, 100 ISO


1. Yes it is worth trying
2. Hoya R72
3. Expect long exposures, i have been waiting for a clear day so i can calculate the minimum exposure i can get away with and still get a good result. Shoot RAW.
08-16-2007, 04:25 AM   #3
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K100 for infra-red (IR)

I would love to put my K100 to some IR use. I also think to understand that there is a certain type of filter on the sensor that filters out IR light?

My question is this:

- how can I remove this filter premanently?

I planning on making the K100 a premanent IR camera, so not fussed about being able to take normal shots with it afterwards. However I do need some pointers as to where to go for achiving a K100 IR body!

Technicall adept and happy to give it a go (specially after dismantling a 50mm SMC A marco lens the other day to clean the blades from some oil = works like a charm now, with less dust too!)

Please let me know of anything that you think will be of help.
08-16-2007, 04:41 AM   #4
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If you look around, there's a semi-recent thread where someone converted their K100D.

It wasn't a very smooth conversion - They managed to kill the camera and had to send it in to Pentax service. Still, in the end getting the unit fixed cost less than many companies charge for IR conversions for other cameras. (He was able to convince Pentax not to replace the IR filter.)

08-16-2007, 04:53 AM   #5
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Acutally it was a K110D. Getting at the K100D is going to be very hard with the SR mechanisms in place. You can also try the *Ist D which I heard was pretty good. The newer *Ist digitals works pretty well with a infrared filter too.
08-16-2007, 06:02 AM   #6
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I vaguely remember hearing that the K100 has minimal IR filtering and that it may even be possible to take IR photos hand-held.

-Colin
08-16-2007, 06:38 AM   #7
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I'm just getting in to this. The K10D is way less sensitive to IR light than either the *ist D or *ist DS. That doesn't mean you can't do it, it simply means that you'll need long exposure times and a tripod. Like Cideway's shots, you'll get smoothed-out foliage unless it is an amazingly still day.


As for modding your camera, you basically have to do this:
Pentax DS Modding by xdeltax.com


You can check out some of my recent IR exploits here:
My recent shots on pbase.

Notice the difference between mine and Cideway's shots in regards to the trees. The shot below was taken in setting sunlight, fairly close to dark, so I had to bump up to ISO 800 to keep it hand-holdable. But if you look at Cideway's exposure times you'll see the difference.
08-16-2007, 07:23 AM   #8
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carpents,

Did you MOD your K10 or just use a Hoya 72 filter?

Chuck

08-16-2007, 12:03 PM   #9
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QuoteOriginally posted by Chuck Lee Quote
carpents,

Did you MOD your K10 or just use a Hoya 72 filter?

Chuck
These were taken with the *ist D.

In bright sunlight, you can shoot at ISO 200, f/4, and 1/30th with a totally unmodified *ist D.
08-16-2007, 03:15 PM   #10
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Thanks guys - for the cost of a filter, it's certainly worth trying! Cideway, those shots are fantastic. I like the moving foliage - it adds to the otherworldly look of the images. Could you identify the building with the curvy roofline in the second image for me? I know I've seen it somewhere (Adelaide perhaps? Seeing as you're from SA?) and it's going to give me sleepless nights until I can remember where!!

I've got an ND filter on order from the US - apparently it cuts something like 9 stops - and it should be fun comparing...
08-16-2007, 07:38 PM   #11
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Here's the earlier post on a mod for IR shooting:

https://www.pentaxforums.com/forums/pentax-dslr-discussion/7538-modifying-pen...hotgraphy.html
08-17-2007, 04:29 AM   #12
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QuoteOriginally posted by Mandi Quote
Thanks guys - for the cost of a filter, it's certainly worth trying! Cideway, those shots are fantastic. I like the moving foliage - it adds to the otherworldly look of the images. Could you identify the building with the curvy roofline in the second image for me? I know I've seen it somewhere (Adelaide perhaps? Seeing as you're from SA?) and it's going to give me sleepless nights until I can remember where!!
Adelaide Convention Centre.
08-17-2007, 02:44 PM   #13
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Aha!! Thanks!
08-17-2007, 07:17 PM   #14
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Hello,

I'm the one who removed the filter from a 4 day old K110D. Yes, the K110D is easier because the sensor is firmly mounted to the circuit board. Unfortunately I broke a switch off the main board of the camera. So I sent it off to Pentax for repair, and after 6 weeks it came back as a great IR and Nebula camera. If you look for a thread from a few days ago on IR you will see a photo I took with an exposure of 1/3000 second! My wife's istD does pretty well with IR, but not nearly as fast as my filterless K110D.

The filter is cheap enough (Hoya R72 is about $44) that you can certainly try it out on your unmodified K100D. If you like the effect, and want something to use handheld then consider buying one of the many used istDs available. It can do IR and normal photography, whereas my modified camera is so red even custom white balance does not produce good looking color. The WB is good enough for astro work if I want normal looking stars. Where my K110D really shines is emission nebulas at 656 nm wavelength.

I should clarify, "handheld." With IR you can't see a thing through the viewfinder. I take a few test shots or use preview mode to focus and frame the shot then take my final. It certainly is not point and shoot!
08-19-2007, 02:47 PM   #15
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My previous post mentions a used istD being a good IR camera. If you read my new post on thread "Infrared With The *ist D" I tested an istD, K100D, and modified K110D. To my surprise the istD and K100D came out roughly equal with a Hoya R72 filter. This contradicts what I and other have been saying.
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