sdQ arboretum image

JLK said:

Carl,

Is this combo just to facilitate doing both IR and normal out in the field? How do the colors compare to the built in dust-protector? It looks good from what I can see.

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Carl Schofield said:

JLK said:

Carl,

Is this combo just to facilitate doing both IR and normal out in the field? How do the colors compare to the built in dust-protector? It looks good from what I can see.

--
Jim

Click to expand...

Yes Jim, the dust shield/hot mirror is in storage. I carry the camera with 18-35 lens and an R72 IR pass filter and Kolari CC hot mirror filter so that I can switch between full color and 720 nm IR imaging just by changing filters. The Kolari filter gives slightly cooler images compared to the dust shield IR cut when using daylight or auto WB, but I use a custom white balance when shooting color and just switch the camera to monochrome mode for IR.

--
Carl
Website: http://www.schophoto.com/gallery/

Click to expand...

xpatUSA said:

Carl Schofield said:

JLK said:

Carl,

Is this combo just to facilitate doing both IR and normal out in the field? How do the colors compare to the built in dust-protector? It looks good from what I can see.

Click to expand...

Click to expand...

Click to expand...

Carl Schofield said:

xpatUSA said:

Carl Schofield said:

JLK said:

Carl,

Is this combo just to facilitate doing both IR and normal out in the field? How do the colors compare to the built in dust-protector? It looks good from what I can see.

Click to expand...

Click to expand...

Click to expand...

Click to expand...

xpatUSA said:

Carl Schofield said:

xpatUSA said:

Carl Schofield said:

JLK said:

Carl,

Is this combo just to facilitate doing both IR and normal out in the field? How do the colors compare to the built in dust-protector? It looks good from what I can see.

Click to expand...

Click to expand...

Click to expand...

Click to expand...

Click to expand...

Carl Schofield said:

xpatUSA said:

Carl Schofield said:

xpatUSA said:

Carl Schofield said:

JLK said:

Carl,

Is this combo just to facilitate doing both IR and normal out in the field? How do the colors compare to the built in dust-protector? It looks good from what I can see.

Click to expand...

Click to expand...

Click to expand...

Click to expand...

Click to expand...

Click to expand...

xpatUSA said:

Carl Schofield said:

xpatUSA said:

Carl Schofield said:

xpatUSA said:

Carl Schofield said:

JLK said:

Carl,

Is this combo just to facilitate doing both IR and normal out in the field? How do the colors compare to the built in dust-protector? It looks good from what I can see.

--
Jim

Click to expand...

Yes Jim, the dust shield/hot mirror is in storage. I carry the camera with 18-35 lens and an R72 IR pass filter and Kolari CC hot mirror filter so that I can switch between full color and 720 nm IR imaging just by changing filters. The Kolari filter gives slightly cooler images compared to the dust shield IR cut when using daylight or auto WB, but I use a custom white balance when shooting color and just switch the camera to monochrome mode for IR.

Click to expand...

Hello Carl,

Currently I have the SD1 Merrill with the hot mirror out and that seems an excellent idea compared to messing with it in the field.

Do you have a link to that exact Kolari lens filter please?

S'OK I found it:

http://kolarivision.com/product/kolari-vision-color-correcting-hot-mirror-filter-uvir-cut-filter/

The slope in the red region of the curve is a bit bothersome to this pedant. ;-) The B+W 486 looks more like the Sigma response and the Tiffen allows a bit of NIR through - have you tried either one?

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Hi Ted,

The 486 is an interference type filter and the Kolari is an absorption filter. The Sigma internal is closer in design to the 486, but I've found that the 486 on a lens does not cut enough IR and there is some leakage, particularly at the edges. I had a 486 on my lenses when using my Leica M8 that had a weak internal IR cut filter on the sensor and it did OK, but not as good as the Kolari absorption filter on my full spectrum converted Sony camera and the Sigma with dust shield removed.

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Thanks Carl,

I've ordered a Kolari but am still a little concerned about that cool look - especially with the lower response of the Merrill bottom layer compared to other Sigmas. Could you tell me more about this "IR leakage", it's cause and it's effects, please?

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Ted,

I think that all you need to do is make an in camera custom white balance using a neutral card as a target and that should take care of the cool look. I just made one custom white balance outside in daylight with the Kolari filter and use it whenever I'm shooting outdoors.

Click to expand...

Thanks, I'll do that.

xpatUSA said:

I think that the 486 is sensitive to the angle of light striking the filter and this can cause some color casting near the edges of the image.

Click to expand...

Interesting, I hadn't thought of that . . .

--
"What we've got hyah is Failyah to Communicate": 'Cool Hand Luke' 1967.
Ted

Click to expand...

Carl Schofield said:

Here are some examples that I shot this afternoon using the sdQ with both the Kolari CC and IR R72.

Kolari on 18-35, custom in camera white balance



Same file processed in SPP 6.4 using daylight white balance

Click to expand...

xpatUSA said:

Carl Schofield said:

Here are some examples that I shot this afternoon using the sdQ with both the Kolari CC and IR R72.

Kolari on 18-35, custom in camera white balance



Same file processed in SPP 6.4 using daylight white balance

Click to expand...

Quite a difference, obviously due to the Kolari filter transmission characteristic. I wonder if the "cooler" in-camera WBs like Shade or Overcast would be more suitable than Daylight? Just a thought, especially Shade.

Guess I'll find out soon enough, eh?

Click to expand...

xpatUSA said:

xpatUSA said:

Carl Schofield said:

Here are some examples that I shot this afternoon using the sdQ with both the Kolari CC and IR R72.

Kolari on 18-35, custom in camera white balance



Same file processed in SPP 6.4 using daylight white balance

Click to expand...

Quite a difference, obviously due to the Kolari filter transmission characteristic. I wonder if the "cooler" in-camera WBs like Shade or Overcast would be more suitable than Daylight? Just a thought, especially Shade.

Guess I'll find out soon enough, eh?

Click to expand...

Picked up the Kolari and the 486 from the Post Office yesterday. Up in the early hours to play indoors with them on the full-spectrum SD1M, with the 17-50mm EX DC set to 50mm focal length.

For me, shooting the SD1M sans dust-cover with filters other than the "traditional" 720nm is a new experience. So I shot the color-checker card to see how it looks with those filters.

The B+W 486 required the least correction to get the mid-gray patch looking, well, mid-gray. But, down the sides of the corrected shot, some green appeared. First time I've seen that oft-reported coloration.

The Kolari, not surprisingly, required quite severe correction and, even then, the L*a*b* color accuracy was quite a bit off compared to the 486. Per my comment quoted above, Overcast WB was closest, needing a mere +13C +7Y in SPP 5.5.3 to get gray. Lighting for both was a "warm" LED strip-light, for which I usually set Incandescent in-cam, so changing from that to Overcast is quite a hop! No green coloration with the Kolari though.

Next step is outside shots armed with the Kodak white/gray card and the color-checker card . . .

--
"What we've got hyah is Failyah to Communicate": 'Cool Hand Luke' 1967.
Ted

Click to expand...

Carl Schofield said:

xpatUSA said:

xpatUSA said:

Carl Schofield said:

Here are some examples that I shot this afternoon using the sdQ with both the Kolari CC and IR R72.

Kolari on 18-35, custom in camera white balance



Same file processed in SPP 6.4 using daylight white balance

Click to expand...

Quite a difference, obviously due to the Kolari filter transmission characteristic. I wonder if the "cooler" in-camera WBs like Shade or Overcast would be more suitable than Daylight? Just a thought, especially Shade.

Guess I'll find out soon enough, eh?

Click to expand...

Picked up the Kolari and the 486 from the Post Office yesterday. Up in the early hours to play indoors with them on the full-spectrum SD1M, with the 17-50mm EX DC set to 50mm focal length.

For me, shooting the SD1M sans dust-cover with filters other than the "traditional" 720nm is a new experience. So I shot the color-checker card to see how it looks with those filters.

The B+W 486 required the least correction to get the mid-gray patch looking, well, mid-gray. But, down the sides of the corrected shot, some green appeared. First time I've seen that oft-reported coloration.

The Kolari, not surprisingly, required quite severe correction and, even then, the L*a*b* color accuracy was quite a bit off compared to the 486. Per my comment quoted above, Overcast WB was closest, needing a mere +13C +7Y in SPP 5.5.3 to get gray. Lighting for both was a "warm" LED strip-light, for which I usually set Incandescent in-cam, so changing from that to Overcast is quite a hop! No green coloration with the Kolari though.

Next step is outside shots armed with the Kodak white/gray card and the color-checker card . . .

--
"What we've got hyah is Failyah to Communicate": 'Cool Hand Luke' 1967.
Ted

Click to expand...

Use the gray/white card outdoors to make an in-camera custom white balance with the Kolari filter on the lens. You should not need to make any manual adjustments in SPP, just be sure to use the custom WB setting in SPP that will use the one written to the file from the camera.

Click to expand...