I am wondering about this too. One would think with those big MCS storms at the end of many chase days, and many chasers around, sprites would not go unnoticed. But, most people interested in sprites have a strong interest in lightning in general, I guess.... and may start lightning photography after the tornado phase is over. Then you're actually too close to observe sprites.
To record sprites, I am not sure most camcorders would be sufficiently sensitive. Low-light b/w surveillance cams (Sony ExView 1/3 or 1/2 inch CCDs) with bright aperture lenses (<f/1.0) are normally used to record them, in the scientific pursuit. The people who use this type of camera are often advanced amateur astronomists, who want to capture meteor showers or deep sky objects through their telescope.
It might also be worth trying a DSLR at highest sensitivity, use great optics (not a zoom but a f/1.4 standard or telephoto lens for example), and being patient.
Have a look at
www.eurosprite.net and check our latest results if you are interested
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I am very curious if anyone has seen/recorded them somewhere, so please let me know if you have!
Oscar