Hi-Con IR (IR imagesetting film)

[MCB18]

I’m actually pretty stoked about this not gonna lie. Wish I had a LF camera to expose it as sheets, I can get 11x14 sheets from this roll and I bet it would look absolutely amazing

 

[MCB18]

Developed a test strip in Rodinol 1+50 for 10 minutes, the results at EI 3 are basically identical to the D76 results.

I am going to make a couple of rolls of this stuff that I can take out and about tomorrow and get some pictures in the field. See if this nice behavior continues when it’s not in a somewhat controlled environment.

 

[MCB18]

Still don’t have proper scans, but using data from a similar film I made this chart showing the spectral sensitivity of the film. I was assuming “log exposure” and “relative speed” are the same thing, but honestly idk.

 

[MCB18]

I finally scanned the visible light and IR negatives I took like a month ago, properly this time. And I haven’t quite finished processing them, but I think I might’ve discovered something absolutely wild. One of the pictures didn’t turn out how I expected it to. I took a picture of a tree, and it should be pretty dark. But it’s not, it’s almost white… I think this film is so insensitive to green light that I’m getting wood effect without an IR filter. I didn’t even realize that that was possible. I will post the finished scans when I’m done with them.

 

[MCB18]

Yeah I know the scans aren’t the greatest, and I definitely missed focus when shooting some of those shots, but here are the scans. And yes I am aware that there was a hair in my film gate when shooting, I wanted to clone it out but I couldn’t figure out how.

All were developed in HC-110 F for 9 minutes. The last one used a 720nm filter.













Notice in the 4th picture that the tree is very bright where the sun hits it despite the other green objects shown (the color chart in the first picture and the back car in the 3rd picture) being extremely dark. As said earlier, I suspect that this is the Wood effect, despite no filter being used.

 

[Andrew O'Neill]

You should probably post a colour photo alongside the colour chart, for easier reference...

 

[MCB18]

You should probably post a colour photo alongside the colour chart, for easier reference...

Here you go:

 

[koraks]

I suspect that this is the Wood effect, despite no filter being used.

I'm not so sure; I think this is mostly because we're looking at a precipitously steep curve.

 

[Andrew O'Neill]

Just to make it easier...

 

[MCB18]

I'm not so sure; I think this is mostly because we're looking at a precipitously steep curve.

As in, you think I’m just over exposing the trees? Honestly, I don’t think so.I just took some pictures of trees with and without an IR filter, as well as a green trashcan that happens to be a similar color to some foliage it is next to with and without an IR filter. I did check, the trashcan does not reflect a much IR light.

In theory, all the greens in the non-filtered images should be dark, and the trash can should remain dark even with an IR filter. I can already tell you, looking at the negatives, the trees are lighter than they should be.

 

[koraks]

Sorry, you're right; having had a look again this must indeed be at least partially related to the spectral sensitivity. I misread what was happening on the color checker (thanks @Andrew O'Neill for the side-by-side!) and on closer scrutiny, the gradient in the sky compared with the tree foliage is indeed supportive of your analysis.
The reason I was skeptical at first is the lack of definition in the tree top vs. the bright part of the sky, suggesting that part of the scene is simply pushed so far onto the shoulder that regardless of color, exposure was basically complete. I still think that's happening, but there's also a spectral effect going on.

 

[Chromium VI]

In the other day I was very interested on an old (very old) Agfa Avantra image-setter (with original agfa PC running win95 and monitor) that I was seeing working to make some negatives for plate burning. I wonder how this film would work for enlarging negatves from BW slides... If I get my hands on such film I would try developing it in Levy's POTA developer, it should give a more 'normal' gradation.

 

[MCB18]

Well I may have jumped the gun a bit, the green trees appear much more normal in these photos, while the reflected IR actually blows the highlights out lol. And as expected, the green trash can is nearly dark. Again, developed in HC-110 F for 9 minutes.

Without filter:


With filter:


Reference photos from my phone:

 

[revdoc]

Some green vegetation contains a significant amount of red and yellow pigments, usually not visible due to green chlorophyll. So rather than the wood effect, you might just be seeing those.

 

[MCB18]

Some green vegetation contains a significant amount of red and yellow pigments, usually not visible due to green chlorophyll. So rather than the wood effect, you might just be seeing those.

Possibly. Either way, this film has an excellent amount of IR sensitivity and I think it might be very interesting for some folks to use. I am planning to offer it on the classifieds at some point although I do have a bit of a backlog at the moment so might hold off on that for now.