WI: Earlier invention of photography

Although photography was only invented in the 1820s, it could easily have been invented much earlier. The camera obscure dates back to the time of the ancient greek, early magnifying glasses are recorded dating back to 400 BC, lenses were rediscovered in the 12th century and silver nitrate was discovered in the 12th century. Thus, photography could easily have been discovered in the Middle Ages, but never was. Let's say that in this alternate timeline, photography is invented hundreds of year before OTL. What are the changes? How does it affect history?
 
What is most interesting is some of the associated technologies- I can't remember where I read it, but apparently electroplating built on some of the chemical advances made in photography.
 
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