Manual Focus Lenses Forum

iangreenhalgh1 · Expire: 2014-01-07

I converted my EOS 1d mkII N to full spectrum to use for handheld IR photography and maybe some astrophotography with my MTO-1000.

Initial post conversion test shots with Canon EF 24-85:

#1 no filter - visible + IR, soft because IR and visible light focus at different points.

#2 with 720nm IR filter

#3 after AWB in GIMP

#4 Swapped red and blue channels

#5 with 720nm IR filter

#6 desaturated in GIMP, contrast boosted

#7 after AWB in GIMP, contrast boosted and red and blue channels swapped.

visualopsins · Expire: 2027-07-11

Very nice results! Was conversion difficult? Iirc involves precision grinding off the filters covering the sensor.

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iangreenhalgh1 · Expire: 2014-01-07

It was a really easy conversion as I just removed the hot mirror altogether and didn't replace it with a new filter.

I did it this way to give full flexibility of what filters I use so I can use the same camera to produce 600nm false colour semi-IR images as well as 720nm IR-only.

I might convert another camera and fit a 720nm filter in place of the hot mirror, not sure yet.

iangreenhalgh1 · Expire: 2014-01-07

The weather has been rotten here - heavy rains and thunderstorms, so still not ventured into the forest to try this converted camera out, but I did snap a few shots with a 600nm filter to get a false colour image rather than the also monochrome of a 720nm filter.

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iangreenhalgh1 · Expire: 2014-01-07

Second attempt at infrared with the EF 24-85, this time using a red (660nm) filter. The lack of sunshine makes things much more difficult.

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philslizzy · Joined: 07 Aug 2012 Posts: 4753 Location: Cheshire, England

Great pics Ian, messing about with the colours makes every picture in a batch looks unique.

I've done the colour channel swopping, it doesn't always work. But the black and white pics are great. Yours are just right.

I converted a Panasonic bridge camera years ago and I get great results from that.

visualopsins · Expire: 2027-07-11

+1 b&w

I'd like to see 850nm filter results. Might be difficult to focus accurately though...

iangreenhalgh1 · Expire: 2014-01-07

Cheers guys. I have just bought a cheap 850nm torch to try some nightime BW IR shooting. I think it will work without a filter on the lens as there won't be any visible light at night. Of course, I can always buy an 850nm filter if needed.

Here's my third attempt at IR with the EF 24-85, but this time using a red (660nm) filter. There was plenty of light but it was a very cloudy, gray day with very flat lighting. This proved to be a bad thing for IR, so it seems that, like with visible light, you need good sunlight for IR if your images are to avoid looking flat.

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