Infra Red Digital Photography

Whew- that is a long time ago. I really don't recall, but I am fairly sure I used Curves in LAB colourspace. Looking at the image. I imagine I reversed the a-channel and steepened the b channel, and changed the vertical values as well, but I would have to try it out to be sure.
 
Ernesto and others,

I can say for sure that the M-mount CV 15mm lens shows a hot spot at smaller f stops, which brings up an observation. It seems to me that the intensity of the hot spot is related to the size of the lens aperture used. The smaller the aperture, the more defined and hotter the spot. So the CV 15mm might be useable at, say, wide-open to f 5.6. I aim to try this on the next outing.

I've read somewhere, that for shooting IR, the lens aperture should be no smaller than f-8 for best results (I can't remember why). So this would help for faster shutter speeds with larger f-stops, but this makes focus more critical due to shallower DOF.

Jaap has posted some superior B&W IR images here and other forums, so he may have more insight into this.

BTW, "hand-held" ability varies from person to person. The older I get the less steady my hands are!

Glenn
 
Thought I'd post a recent shot with my M8 and 90mm apo asph f2 shot at f2 , 1/30 sec hand-held with a B+W 093 filter at 160 iso . Note that this lens is on the "Hot Spot" list. At f2, I had to "bracket-focus" several shots to get one with reasonable sharpness. My post processing is nowhere as good as Jaap's. I need to get him to e-mail me a tutorial !! 🙂
Glenn
 

Attachments

  • IR horses Pine Ridge post .jpg
    IR horses Pine Ridge post .jpg
    133.8 KB · Views: 0
Last edited:
M8 + Ir

M8 + Ir

If you own a M8 I don’t see any reason to invest in a converted DSLR. The M8 does a great job, for my view of IR photography. My choice of filters is Harrison & Harrison RD-10 (88A). I believe they custom produce there filters in Ca.. The best I can tell, no web page.
E mail - HarrisonOP@aol.com address -
​
​
​
Harrison and Harrison
1835 Thunderbolt Drive, Unit E
Porterville, CA 93257
559-782-0121​
I like the ability to change to Kelvin settings on the fly with the M8. The available effects are endless. Depending on the filter you use, it is possible to shoot color IR.
Using a fast lens, hand holding is easy. I just review each shot as I go and some times need to shoot wide open. Focusing can be tricky at times, a little back focus works most of the time.
A couple of hand held shots. The color was done in PS with the spray gun tool. Bill

3642539798_d761e033fc.jpg


3597884711_efb9e12f4e.jpg


Just a little extreme.

3710875346_a54c83bf05.jpg
 
That is GREAT!!!!
I can guess, that you may be changed the R channel for the G channel, and viceversa...
Am I right?
It is a great look!
E
 
ernesto said:
That is GREAT!!!!
I can guess, that you may be changed the R channel for the G channel, and viceversa...
Am I right?
It is a great look!
E
Click to expand...

No- that would have killed all greens and reds, and as you can see some have been preserved. As it is I applied a drastic curve in the A channel and a less drastic one in the B channel, whilst keeping the centre points, in LAB colour space.
 
I had my G10 converted to IR by Lifepixel. I expect that I will use this mostly for landscape-type shots, but some city-shooting may work as well - a recent shot from London:
20090823-IMG_0415-Edit.jpg

I previously used a 092 filter in front of the lens (on my GRD2), but it drastically reduces the light available to the sensor.

I will post a few shots on Flickr when I have the time.

Kirk
 
jaapv said:
Very nice Steve, but might I suggest converting to B&W in C1 instead of simply desaturating. The "yellow Filter" profile gives spectacular results.
Click to expand...


Jaap, could you please say a little more about converting to B&W? What is the difference between simply removing the color (desaturating) and the other methods?
 
I would think the DOF with an 18mm lens should cover the Infrared Focus Shift. Try shooting at F8 and make sure to use the IR index

Some lenses do better than others. The old Summicrons are great for it as the DOF at F2 just about covers the IR index. Calcium Fluorite and APO lenses lenses do not have this problem.
 
In bright light, the M8, with R72 filter works great, need to up the iso a bit, and open up the lens, but handheld IR photography is very easy.

Here's a sample
 
No, I mean HIDEOUS!

No, I mean HIDEOUS!

No, it's not a focus issue it's obviously much more fundamental than that!

Pic attached! M8, bright sunny day, 93 filter

3971459773_4ffd685643_o.jpg


No, that's not the sun in the frame. I have tried it a few times now and all the pics look just like this!
 
You must log in or register to reply here.
Back
Top Bottom