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Old 22nd August 2013, 06:25 PM
alexmuir alexmuir is offline
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Default Does electronic flash contain infra red?

I have been considering making some IR images at night with flash. I recall seeing pictures made on IR film where the flash was filtered, so I assume the spectrum must contain the type of IR that can be recorded on film. I don't think it will be necessary to filter the flash if there is a filter on the camera. Has anyone tried this, or seen anything published about this technique? Thanks, Alex.
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Old 22nd August 2013, 06:43 PM
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I haven't tried it but the only reason to filter the flash is to make it invisible at night.
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Old 22nd August 2013, 07:12 PM
Lostlabours Lostlabours is offline
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The filtere can be on the lens or the flashgun, you'll need to do some speed tgests though.

As Miha says over the flash allows images to be made without it being visible.

Ian
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Old 22nd August 2013, 07:13 PM
alexmuir alexmuir is offline
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If it stays dry, I may try a couple of shots tonight to see what it looks like. I saw some work by a young artist recently who was ' painting with light'. He was using normal materials, but it made me think that the same technique with IR could be interesting. Alex
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Old 22nd August 2013, 10:17 PM
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Try aiming a flash burst through an IR filter (without looking at it directly).
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Old 22nd August 2013, 10:57 PM
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I have done some test shots tonight and will report back when the film is finished. Alex
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Old 23rd August 2013, 12:49 PM
Terry S Terry S is offline
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I'm with Michael.

I would put an IR filter on the flash unit, which then ensures that the light output from it has the IR wavelength.

Putting an IR filter on the lens and not on the flash may not work, but your tests will tell you.

Thinking about it, the flash probably has little or no IR output, for I have an IR flash unit receiver unit that is plugged into studio flash units and the flash trigger has an IR filter on it as a straight flash light DOESN'T trigger the studio unit. So now I think that I am right with my first thought and comment.

Do let us know how you get on though.

Terry S
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Old 24th August 2013, 08:07 AM
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I'm sure there is some. I have heard of people putting IR filters over flashes and shooting on IR film at night with an 'invisible' flash.

It is possible that it was very deep red though rather than true IR.


Steve.
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Old 24th August 2013, 11:58 AM
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Quote:
Originally Posted by Steve Smith View Post
I'm sure there is some. I have heard of people putting IR filters over flashes and shooting on IR film at night with an 'invisible' flash.

It is possible that it was very deep red though rather than true IR.


Steve.
Steve, I think that you are getting confused some what...

By putting an IR filter over / onto flashes, it is THE FILTER that is then producing the IR light and NOT the flash, so basically as I thought and said directly above your comment.

Terry S
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Old 24th August 2013, 12:04 PM
Lostlabours Lostlabours is offline
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Quote:
Originally Posted by Terry S View Post
Steve, I think that you are getting confused some what...

By putting an IR filter over / onto flashes, it is THE FILTER that is then producing the IR light and NOT the flash, so basically as I thought and said directly above your comment.

Terry S
I think it's you that's confused Terry, only the flash emits light, the filter just stops everything except the infra red part of the flash's output, and it doesn't matter whether the filters on the flash or the lens if the flash is the only light source.

Ian
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