Yes this is the only information I found as well David.
What confuses me a little is, are 16bits input in Agisoft still 16/32bits when saved out as exr, or have the inputs tiff files already been converted to 8bit and then converted back to 32 exr?
On the other hand it might be better as said to save out exr's all the way to be on the safe side. Exr files are usually smaller than tiffs which is good..but it adds one extra step in production for me since Adobe Camera Raw doesnt save out exr, I first have to save out tiffs then batch save them to exr in photoshop..