You make a good point, but going by some cursory research (starting with [1]), it seems to me that while initially daguerrotype portraits took 10-15 minutes to

You make a good point, but going by some cursory research (starting with [1]), it seems to me that while initially daguerrotype portraits took 10-15 minutes to expose, several innovations had reduced the exposure time to well under a minute by the 1850s. (The earliest photo in the article is from 1873, the most recent is from 1903.) [1] https://en.wikipedia.org/wiki/Daguerreotype#Reduction_of_exposure_time https://en.wikipedia.org/wiki/Daguerreotype#Reduction_of_exp...