joecichjr
Loc: Chicago S. Suburbs, Illinois, USA
Cold as could be, Lake Katherine Nature Center
I like them. What’s the nm?720?
joecichjr
Loc: Chicago S. Suburbs, Illinois, USA
sueyeisert wrote:
I like them. What’s the nm?720?
Exactly! I wish I had know then what I know now when I was getting the camera converted. I would have done a full spectrum and not be so limited now....
joecichjr
Loc: Chicago S. Suburbs, Illinois, USA
How about you, Mike? Did you get a conversion done yet? Remember, read about full-spectrum!
joecichjr wrote:
Exactly! I wish I had know then what I know now when I was getting the camera converted. I would have done a full spectrum and not be so limited now....
What filter did you have installed? For instance, if you chose 590nm, you can add any filter with a longer wave length, and will act as a camera that new longer wave length. Example, if you have a 590nm conversion, you can add a 636nm, or a 720nm, or even an 850nm.
But it doesn't work the other way. If you have a 720nm, you can't add a 590nm.
I had a conversion done some years back but don't remember which nm i had done. Is there a way to tell in the camera or do I need to go back to the company that did the conversion?
fcatmandu wrote:
I had a conversion done some years back but don't remember which nm i had done. Is there a way to tell in the camera or do I need to go back to the company that did the conversion?
There certainly is. Check out this youtube video by Rob Shea. He provides a file to download in which you can take a picture of your monitor and to figure out where your camera fits in. One thing he didn't say. I think you should pick a sunny white balance to do this test. If you do a custom white balance, the results may shift that he is showing.
https://blog.robsheaphotography.com/2023/08/05/which-infrared-filter.htmlThere is also another way that I can make a determination that can be used by someone that uses multiple filters. I have a full spectrum and can use any filter I want to use. But I find that if I just take a picture with a known white balance such as Sunny, and just look at the image before I do any channel swapping, the different filters produce a overall color cast that is different for the different filters, but is constant for a given filter. That way, if I have forgotten what filter I used, I just look at the unprocessed image and can immediately tell what filter I used. You would need to shoot several images with different filters to produce some sample images to have something to compare to.
Note: I shoot RAW and do not do custom white balances in JPEG which could drastically affect these color casts. And also, with RAW, I find no advantage to custom white balance on green grass for instance. RAW allows me to shift colors as far as I want. I did some experiments where I compared end results using sunny WB, then custom WB using green grass, and then used cloudy, tungsten and florescent WB's. Then processed the results, in each case, I got the same end result, and the work involved was no more difficult.
But if you shoot JPEG, this won't work.
joecichjr
Loc: Chicago S. Suburbs, Illinois, USA
Thanks so much. My IR camera is used nowhere near enough
joecichjr
Loc: Chicago S. Suburbs, Illinois, USA
JimH123 wrote:
What filter did you have installed? For instance, if you chose 590nm, you can add any filter with a longer wave length, and will act as a camera that new longer wave length. Example, if you have a 590nm conversion, you can add a 636nm, or a 720nm, or even an 850nm.
But it doesn't work the other way. If you have a 720nm, you can't add a 590nm.
720, before I knew what you just told me
joecichjr
Loc: Chicago S. Suburbs, Illinois, USA
fcatmandu wrote:
I had a conversion done some years back but don't remember which nm i had done. Is there a way to tell in the camera or do I need to go back to the company that did the conversion?
I couldn't tell you.
I am mad at myself that I did the 720nm, because it is almost totally limiting.
Can screw on any other nanometer filters unless they're above 720.
joecichjr
Loc: Chicago S. Suburbs, Illinois, USA
JimH123 wrote:
There certainly is. Check out this youtube video by Rob Shea. He provides a file to download in which you can take a picture of your monitor and to figure out where your camera fits in. One thing he didn't say. I think you should pick a sunny white balance to do this test. If you do a custom white balance, the results may shift that he is showing.
https://blog.robsheaphotography.com/2023/08/05/which-infrared-filter.htmlThere is also another way that I can make a determination that can be used by someone that uses multiple filters. I have a full spectrum and can use any filter I want to use. But I find that if I just take a picture with a known white balance such as Sunny, and just look at the image before I do any channel swapping, the different filters produce a overall color cast that is different for the different filters, but is constant for a given filter. That way, if I have forgotten what filter I used, I just look at the unprocessed image and can immediately tell what filter I used. You would need to shoot several images with different filters to produce some sample images to have something to compare to.
Note: I shoot RAW and do not do custom white balances in JPEG which could drastically affect these color casts. And also, with RAW, I find no advantage to custom white balance on green grass for instance. RAW allows me to shift colors as far as I want. I did some experiments where I compared end results using sunny WB, then custom WB using green grass, and then used cloudy, tungsten and florescent WB's. Then processed the results, in each case, I got the same end result, and the work involved was no more difficult.
But if you shoot JPEG, this won't work.
There certainly is. Check out this youtube video b... (
show quote)
Thanks for the great information. Rob Shea seems to really know his stuff
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