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09-11-2012, 12:29 PM   #1
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k-5 IIs - Infrared Filter?

When reading the news about the new K-5 Mark IIs, the one without the AA filter, I was wondering what this would mean for near Infrared shooting.

Is it the AA filter that blocks most of the Infrared light in normal cameras? I've read about people who removed that filter in front of the sensor to achieve very good performance with a R72 or similar filter (on the lens) .

Any chance that we now have a k-5 II that can 'see' infrared?

09-11-2012, 12:43 PM   #2
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While many sensors may combine the AA and IR filters into one, the current cameras without an AA still have an IR filter. Leica's earlier M8 had neither, and it was necessary to use an IR cut filter on every lens to reduce color casts on black and very dark parts of the image. So for the Leica M9 (which also had no AA filter) they made sure to incorporate an IR filter.
I expect Pentax learned from Leica's problems, and uses a sensor that still has a IR filter.
I have seen some nice IR pictures taken with the M8, so your idea has merit. (The M8 is "reasonable" on the used market if you want to do IR.)
09-11-2012, 01:00 PM   #3
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QuoteOriginally posted by TomB_tx Quote
While many sensors may combine the AA and IR filters into one, the current cameras without an AA still have an IR filter. Leica's earlier M8 had neither, and it was necessary to use an IR cut filter on every lens to reduce color casts on black and very dark parts of the image. So for the Leica M9 (which also had no AA filter) they made sure to incorporate an IR filter.
I expect Pentax learned from Leica's problems, and uses a sensor that still has a IR filter.
I have seen some nice IR pictures taken with the M8, so your idea has merit. (The M8 is "reasonable" on the used market if you want to do IR.)
I have one for sale.
09-11-2012, 01:20 PM   #4
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QuoteOriginally posted by Noisychip Quote

Is it the AA filter that blocks most of the Infrared light in normal cameras?
The IR filter is sandwich between the AA glass so different filter.
There are about 4 or 5 pieces of glass on the sensors.

09-11-2012, 02:38 PM   #5
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QuoteOriginally posted by Fontan Quote
I have one for sale.
No you don't - that sale expired.
09-11-2012, 05:09 PM   #6
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QuoteOriginally posted by Tom S. Quote
No you don't - that sale expired.
Damn. You are right. The donation expired yesterday!
09-20-2014, 05:28 AM   #7
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QuoteOriginally posted by Noisychip Quote
When reading the news about the new K-5 Mark IIs, the one without the AA filter, I was wondering what this would mean for near Infrared shooting.

Is it the AA filter that blocks most of the Infrared light in normal cameras? I've read about people who removed that filter in front of the sensor to achieve very good performance with a R72 or similar filter (on the lens) .

Any chance that we now have a k-5 II that can 'see' infrared?

The Pentax K100D Super has an IR filter but it is sufficiently weak that one can take nice NIR images. I use a Tiffen 87 filter on an old Vivitar f/2.8 prime that allows me to use the aperture ring (I haven't tried using autofocus, but I've seen others reporting good success with it. I take a series of shots around the red line IR offset on the lens and pick the best one in PP). With this system at ISO 200 and f/5.6, I get decent RAW images at about 1 sec exposures.


It so happens, I just bought a K5 IIs and was wondering the same thing you are. So I just went outside and tested it using the same lens and filter I use on the K100D Super. It takes much longer exposures to achieve any meaningful response from the sensor, making it unusable for NIR just like the K5 I have that uses the AA filter. So from this comparison, I would say the IR filters are similar despite removal of the AA filter.


If you are interested in NIR, see if you can pick up a used K100D Super body.
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