What’s the difference between 715nm and 830nm conversions? Not a whole lot. The 715 conversion lets in red visible light, the 830nm conversion doesn’t so there are a few differences:

• Exposure time on an 830nm conversion will be about twice as long the 715 conversion (both cameras autoexpose accurately, though). This can be the difference between “need a tripod” and “don’t need a tripod.”
• The 830nm conversion uses all three channels (R, G, B) fairly equally, while the 715nm uses mostly the red channel. In theory this should make the 830 images a bit sharper. In practice, maybe, maybe not.
• The 830nm conversion has a “more IR” look: skies are darker, clouds whiter.
• You can get images with a 730nm in artificial light, but indoors (especially with fluorescent light) there’s not enough IR floating around to really get a picture with the 830nm conversion.

Truth is, unless you are waaayyyyy into this, it doesn’t make a lot of difference — unless for some weird reason you’re shooting IR under fluorescent light, then avoid the 830nm. I can’t imagine why anyone would do that, but I know for certain if I don’t mention it somebody will.

You can find more information and a few thumbnails comparing shots from the two versions HERE