After an IR conversion, you will be able to shoot handheld with about the same exposure as a normal camera. On a sunny day, you can easily get 1/250 to 1/800 exposures or higher at f10 with the lowest ISO with a converted camera. A 590nm and 665nm filter can actually shoot faster than a regular shot. Adding a deeper infrared filter on the lens (like a 720nm/R72 filter over a 590 conversion will provide the equivelent exposure as a 720nm conversion. The dark filter may cause composing and focusing issues if not using live view, but the sensitivity will still be enough for handheld.