I know, one of my scarce posts I make now and then ;-)
Finally got my dSLR back after 6 looooong weeks from being sent away for warranty repair. Fingers crossed it doesn't pack up again!
Anyway, I haven't been upto much photography, (lack of camera!), but have been putting together some bits that some of you may, (or may not, who knows?), find useful.
This first is how to make your very own infra red filters.
I've made mention of this technique before but never really went into much detail. It's an old'un but a good'un.
Slide or 'transparency' film of old, (and still currently), was usually displayed by projection.
Anyone have to sit through those family slide shows of the family holidays? OK, just me as an old git then, you young'uns don't know what you where missing :-)
This film is usually identified by the process marker 'E6' and is a positive process so that anything white would be clear on the film and anything black would simply be black. They actually look great because you view them with light showing through, (transmissive), almost like a stained-glass window rather than reflective light from prints. Large format slide is simply exquisite to view, (OK, just me as an old git again then).
Because these 'slides' were displayed via a projector they are clear to infra red light otherwise they would melt under the intense heat of the projection bulb.
So if you purchase a blank slide film and send it for processing it will be returned as you can see from the picture above completely black. Plus completely clear to infra red light!! Very handy.
A double thickness, (ie two overlapped pieces), is as good as any 720nm commercially available filter. If you want bigger pieces then purchase a '120' slide film and if you want really big bits then you can still obtain large format slide film, (5 inches by 4 inches).
You can use this to make your own Infra red filters for the lens of your camera, (small pieces on your camera phone/compact works well), or as I have done in the picture below make an Infra red flash.
This infra red flash has proved handy as a master studio flash to trigger my studio flashes very reliably, (this can fire a standard optical trigger in broad daylight from about 50 foot away), without showing in the final exposure.
You could of course use an infra red converted flash on an infra red converted camera and take 'night' shots without the flash showing up. Handy for night wildlife photography or even shooting in a nightclub or such without causing disruption.
Well there you have it, an old technique but still handy.
Originally posted at 3:55PM, 27 March 2010 PDT
Victor W. edited this topic 78 months ago.