Pentax K-X with infrared filters?

<p>Hello all,</p>

<p>I have searched through this site, and the web, looking for some specific information on the Pentax K-X dSLR, and IR filters but have not found what I am looking for. <br>

Recently I purchased a Pentax K-X dSLR, and also have a Cokin 007 IR filter. When I first tried this combo I was shooting in manual mode, ƒ11 8sec exposures, and there is a very strong red hue on the entire image. This camera does have a digital filter that can be applied to images take through the lens alone, but I was hoping to get a more dramatic IR look using a separate filter.<br>

Has anyone been down this road already with the Pentax K-X dSLR, that could shed some light on this? Thanks!</p>

<p> </p>

<p>I've always wanted to know about shooting IR through just an IR filter, and not doing the expensive (and permanent) conversion of the camera itself. I read that just getting this Hoya (I think) filter was good enough for IR shots. Maybe someone can chime in about doing this on Pentax cameras... I'm sure it doesn't have to be camera specific, does it?</p>

<p>I've used the Lee 87 infrared filter with my Pentax ist DL with some success. The intial image is purple but I always convert to black and white.</p><div></div>

<p>Hello,<br>

I have the same red hue on my converted K100D, what works for me is to apply Brad's IR action in PS later: <a href="http://www.outdooreyes.com/photo94.php3">http://www.outdooreyes.com/photo94.php3</a></p>

<p>Thank you S B, I will give this a try.</p>

<blockquote>

<p>there is a very strong red hue on the entire image</p>

</blockquote>

<blockquote>

<p>The intial image is purple</p>

</blockquote>

<p>And that is how you tell the difference between a camera that works well with a filter and one that doesn't. A camera with a good built in IR blocking filter produces a deep red image. This is because the only thing that makes it through the camera's internal filter is some deep, barely visible red light (around 680nm), and only the camera's red filter lets that through, the green and blue filters block it. After processing, the images have a limited IR look, foliage isn't as bright as with a "good" IR camera, the sky isn't as dark, resolution is poor, and there are often "jaggie" artifacts.</p>

<p>A camera that works well produces a nice purple or magenta image. The camera's built in filter is letting substantial infrared in. This goes through all three of the camera's color filters: red, green, and blue, so it produces the magenta image. Since you've got IR data on all three channels, you get the camera's full resolution (any softness is either a lens that doesn't work well for IR, or focusing errors). And you're up over 720nm, so the infrared "look" is much stronger.</p>

<p>I had some luck with an R72 filter and my Pentax K-x. The exposure times were between 15 and 30 seconds. I also discovered you need to block the light entering through the view finder. It will totally mess things up. A few examples are in my online portfolio.<img src="../photo/11163453" alt="" /><img src="../photo/11163454" alt="" /><img src="../photo/11163455" alt="" /><br>

<a href="http://www.photo.net/photodb/member-photos?user_id=6107962">http://www.photo.net/photodb/member-photos?user_id=6107962</a><br>

Comments and suggestions are welcome.</p>