GH3 and IR

Started Apr 8, 2013 | Discussions
gskolenda
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GH3 and IR
Apr 8, 2013

Well I can't get my GH3 to give me any kind of exposure, and the shutter won't work, tried every possible exposure, slowest SS and F2.8 Apt, Highest ISO, when using a Hoya 58mm Infrared R72 filter?

Any one got any ideas or experience?

Thanks,

Leon

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Elemental Photography
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Re: GH3 and IR
In reply to gskolenda, Apr 8, 2013

gskolenda wrote:

Well I can't get my GH3 to give me any kind of exposure, and the shutter won't work...

Leon

Wat do you mean by "the shutter won't work"?

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grumpyolderman
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Re: GH3 and IR
In reply to gskolenda, Apr 8, 2013

AFAIK IR photgraphy with a filter is not very sensitive, maybe you just can not get a focus as there is not enough light (IR also focusses slightly to a different position compared to visible light) and the shutter will thus not fire? Try manual focussing or disable focus priority?

JL

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Elemental Photography
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In reply to grumpyolderman, Apr 8, 2013

grumpyolderman wrote:

AFAIK IR photgraphy with a filter is not very sensitive, maybe you just can not get a focus as there is not enough light (IR also focusses slightly to a different position compared to visible light) and the shutter will thus not fire? Try manual focussing or disable focus priority?

JL

It depends on the camera and how effective it is at blocking IR at the sensor. A lot of EM5 users have reported good success with an unconverted camera and IR filter.

I've just run a quick little test and it seems the GH3 is quite good at blocking IR. At least, with a Hoya R72 filter and fairly bright conditions (partly cloudy) I'm getting an exposure in the ballpark of f/2.8, 1/2 second, ISO 12800.  On my GX1 (same lens and filter) I'm getting exposure times closer to 1/15. Ballpark estimate puts the GX1 about three stops more sensitive to IR.

This is hardly scientific, but should explain at least part of what is going on.

Im in the habit of sound af/mf together so I didn't notice any problems with the shutter releasing when I hit the button.

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Jeff Tokayer
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Re: GH3 and IR
In reply to gskolenda, Apr 8, 2013

Somebody did a test in this forum recently, with a few µ4/3 camera. His findings were that the GH3 is the least sensitive (strong filter) and the E-M5 the most sensitive (weak filter).

This could be the reason why you're experiencing focus problems with your GH-3. I wouldn't sacrifice a GH3 or EM5 for IR conversion, but I am doing it with a G3.

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BillHinge
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Re: GH3 and IR
In reply to gskolenda, Apr 8, 2013

GH2 works with a 720nm filter @iso800 and 850nm filter @ iso6400

I recently got a s/h GF1 for a DIY conversion so before I started I did a side by side test and found the GF1 seems to be about 2/3 stop more sensitive than the GH2.

Perhaps as the panasonic cameras evolve the IR cut gets more severe?

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Ollie 2
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Re: GH3 and IR
In reply to gskolenda, Apr 8, 2013

gskolenda wrote:

Well I can't get my GH3 to give me any kind of exposure, and the shutter won't work, tried every possible exposure, slowest SS and F2.8 Apt, Highest ISO, when using a Hoya 58mm Infrared R72 filter?

Any one got any ideas or experience?

Thanks,

Leon

You'll need manual focus, wide aperture (narrow apertures tend to push hot spots) and a slow shutter - i.e: you'll need a tripod in most cases.

Also, IR wavelength is not recognised by the camera and is obviously different to the normal light spectrum so you can't focus with the filter off and then put it on. You need to focus with the filter on by overcompensating in the view finder, or the arduous and fairly hopeless technique of trial and error.

It's an inexact science and a steep learning curve.

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gskolenda
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Re: GH3 and IR
In reply to BillHinge, Apr 9, 2013

Thanks for your input here on this, I'm going to shoot some video tomorrow and I'll try a few IR shots at the recommended settings and manual focus and see what happens.

I'll post here in the next day as to what happened.

Leon

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