Sony A99- Infrared Photography
I think that the a99 with an IR filter can take IR photos as long as you keep the exposure long enough as is the case with almost any other digital camera.
You can of course modify the sensor and remove the IR filter, but it is costly and will require the readjustment of the auto-focus to suit specific lenses. I think that you would be much better off doing this sort of conversion on a NEX.
|Nowhere by Nanard 92|
from The Illusion of Depth and Distance
|Green Tomato by lim yau tong|
from Growing Fruit