Thursday, May 22, 2008

Olive Tree in IR

Our neighbor has an olive which recently got a haircut. I thought it would be interesting to photograph in IR with some funky colors. It isn't exactly fine art, but it is somewhat funky, so mission accomplished.

Technical Specs: Canon Rebel XSi (full spectrum) /w 780nm IR filter, 10-22 @ 10mm, f/8, 1/50s, ISO 200.


Anonymous said...

Hi Aravid, I have a question and hope you can help. I am about to bring a camera for modification and is considering a clear (full spectrum) filter instead of an internal IR filter. Just wondering will the camera get wield colors if you put no IR filter in front of the lens? Will the implent of a clear filter change the sensivity of light after the modification? Thanks in advance :)


Aravind Krishnaswamy said...

Yes, if you don't put an IR filter in front of the lens, there will be color cast (the image will be tinted heavily red) on a full spectrum camera.

Yes, the overall camera sensitivity to light will be higher will a clear filter in front of the sensor and no filter on the front of the lens. This is because the sensor will capture all the light across the full spectrum. With a full spectrum camera and an IR cut filter in front of the lens the camera's sensitivity will be the same (or close enough) as if it still had the factory IR cut filter in front of the sensor.

Hope that helps, email me if you have more questions.

Anonymous said...

Hi Aravind, thank you - you have completed the missing gap and I am much more informed now. I will take a look and see which options I go, either a DC with IR filter, or a DSLR with clear filter plus 1 IR filter and 1 IR cut filter, for IR and normal photos.

Hope this message will help others make informed decisions. Thanks once again.


Aravind Krishnaswamy said...

One more piece of information to add. When you attach an IR cut filter to the front of the lens and then look through the viewfinder, it will have a blue color cast and will look considerably dimmer. The camera will still capture the same image it would capture if the cut filter were in front of the sensor, it will just appear dimmer and bluish to your eyes. So in dim lighting it becomes difficult to judge composition (or focus) through the view finder.

If you do decide to go the full spectrum route, definitely get a DSLR that has Live View and can AF during live view with contrast. This is helpful if you want AF when having IR front filters attached.

I went with MaxMax for both the conversion and the filters, so I recommend them. If you do get the MaxMax filters, I recommend getting the 715nm cutoff and 1000nm cutoff filters as well as the XNite CC1.

Good luck1

Anonymous said...

This is the bonus and thank you for the insider tip. With a Chinese background I have, share with you some of the IR albums I just discovered. Enjoy~~

650nm album:
720nm album:

I am thinking: my D70s (its built-in IR cut filter does not filter all IR) with an IR filter, F8 or smaller with a very slow shutter would create an empty like city in the day. Once day I might try this :)