Infrared w/UG-11 | Conclusion | 35:Chronicle

50mm, black & white, infrared, photography, ug-11

Yes, It Can | But…


Now this post may seem a little redundant and may not interest many at all but, I’m going to write it anyway. It may help someone. Furthermore, the images posted here will be the last IR captures from my UG-11 unit, and, with very good reason.

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Stacks | 1/70th | f4.0 | ISO-800

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UG-11 is predominantly a filter for shooting UV light only and, I have little interest in UV shooting. However, I love to experiment, to push capabilities; I also love infrared photography and, the UG-11 does allow IR light transmission too, though, there is a caveat. Having reviewed the UG-11 datasheet before I ever even experimented with it, it’s clear from the graphs that UV wavelengths from around 230-410nm are captured, quickly peaking at 92% transmission at 330nm and then, quickly dropping off again. Visible light is blocked completely. Infrared light is also transmitted through the filter to the sensor from just over 650nm however there is no visible transmission of IR light until around 680nm. IR light transmission peaks at around 715nm yet at only around 30%, and gradually fades to 800nm, where, transmission of IR drops to between 1 and 5% all the way through to around 1200(+)nm. In other words, from under 800nm, IR light is barely appreciable in visible terms. 

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Almost There (But, Not Quite!) | 1/60th | f5.6 | ISO-1234 (This is not a typo!)

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Being as how IR light has such a hard time getting through, when using a UG-11 to capture it, one finds themselves in a very similar position as if using a normal, unconverted camera, an IR filter on the lens and a tripod. Shutter speeds are slow and the only way to shoot handheld is by utilising high ISOs. This is not always desirable, and, neither is carrying a tripod everywhere. The other issue I have found is that, not only are shutter speeds slower when compared to a bona-fide IR conversion, however, the amount of NIR (near-infrared) radiation captured (even with longer shutter-speeds) is noticeably reduced. The Wood effect is there, sure, but it’s definitely muted. Feel free to peruse my most recent few posts and note that all of those frames posted were taken on extremely bright days and WB was always set to foliage or grass for each subject. They’re still lacking the punch that I have always been used to capturing when using any other conversion. Having said this, I should also say that I don’t like having to create drama using post-processing, and with UG-11, it is unfortunately, necessary to work this way. Having read that UG-11 is good for capturing IR too – I have to contest it’s true value in this particular genre and claim that it is not even close to being on par with a properly converted camera. Yes, it can do it – but far better results will be obtained from a proper IR conversion. This, by the way, leads me to sharing some good news. 

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Muted ‘Wood’ (Full-Sun) | 1/125th | f5.0 | ISO-1000

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My good friend, The Doctor,  in Guildford, received a couple of my camera units this week and, having opened them up on his slab already, has now completed their conversions. Very soon, I shall be in possession of dedicated 760nm and 715nm units, which, I know for a fact I am going to enjoy, certainly while the sun continues to shine, (more than even I probably realise right now). 


It’s a niche, for sure; but there is a growing interest in IR photography and I am very happy indeed to be, not just one who captures it, but also as a source of guidance or information for those who are already or, wish to get involved. My contact page is a click away so do feel free to get in touch. As always, thank you for reading and if IR is your bag, stay tuned!

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As always, thank you for visiting.

All Images and Posts © 35:Chronicle (2018)

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