I recently modified an A2300 by taking out the IR filter and finding a gel filter that blocks red light, and lets IR pass. I took two pictures, one with the rosco 2007 gel filter, and one without. NEITHER image has the built-in glass IR filter.
I used this tutorial to do the image manipulation. I hear there are processing tools out there, I'm going to give them a try, and perhaps create a macro for photoshop to make it quicker.
NIR base - with gel filter
I then processed the image in Photoshop using two methods. First Normalized Differential Vegetative Index (NDVI) in the image at the top, and then NRG (below) where Near-Infrared, Red, and Green are used to compose a picture instead of the usual Red, Green, and Blue. (Thanks for the great site publiclab! http://publiclab.org/wiki/ndvi)
I'm obviously itching to do this with aerial images, but I wanted to throw this out there, and see where I'm falling short. I think the NDVI image begins to show me valuable information (where less IR is reflected) but any tips on improving results is greatly appreciated. Comments on importance of custom white balance are appreciated.
If you have any questions, please don't hesitate to ask! Thanks!