I'm curious about what type of lens would be commonly be found on stereoview cameras from the American Civil War era (in part to help answer someone else's question on a Civil War forum that has piqued my interest).
My guess is that in the 1860s "normal" to slightly telephoto lenses were most prominent in general. In looking at the images of the day there doesn't seem to be a lot - or any, really - of obvious very wide angle images. I imagine that the overwhelming number of images made were studio portraits, and these cameras were, I'd guess, mostly outfitted with slightly long lenses (or that's my guess).
But back to the stereos, which were most likely shot in the field. Would the relatively small image area of a stereo half make them more or less likely to have a tight - as opposed to wide - field of view? Did they make lenses meant for stereos that had much of a wide field? Was there a focal length that would have been a standard for stereos then?
Funny, my two greatest interests are probably CW history and photography, but I'm still feel weak in regards to my knowledge where those two subjects intersect. Thanks for any insights!