Woolburr wrote in post #5819739
There was also the issue of dentistry in those days...the lack of good oral hygiene led to some pretty ratty looking smiles.
A very good point. Thanks.
codex0 wrote in post #5820140
I agree with most of the above theories. Having done wet-plate and daguerreotypy, there is also the fact that the processes are only blue-sensitive. This tends to exaggerate any wrinkles in the face, and as one modern daguerreotypist said, "removes 4/7 of any smile." I've had some people smile and it almost always ends up looking like an angry grimace.
It could also be a cultural thing - prior to photography, there were painted portraits. How many of those have a big cheesy grin on them? When you're just looking at someone normally in everyday life do they have a huge smile on their face? Though I agree that there are a number of reasons why people didn't smile, I think to some extent the smile in picture hadn't yet been "invented."
I didnt know that. And could see why noone wanted to smile if that were the case. Thanks for that explanation.
Darsk47 wrote in post #5820182
Which is why passport photos cannot have the subject smiling (for a Canadian passport anyway - I assume it's the same elsewhere)
The authorities want you in a 'normal' look because you're on camera so many times in an airport....looking normal.
Unless you're the miniscule portion of the population that walks around like Carol Brady with a giant grin all day long.

I smiled in mine, well maybe it was a strong grin, but nonetheless, I was never told not to...hmm. I dunno.
yogestee wrote in post #5820506
Its more to do with the long exposures needed to expose the film..In most studios the subject had to be strapped or braced to stop any subject movement.. Remember in those days cameras didn't have shutters.. The film was loaded, the subject set up and the lens cap removed,,the lens cap acted as the shutter.. Apertures of F/16 and 12ISO was common.. I heard a story where a photographer would estimate his exposure by removing his lens cap and drinking a luke warm cup of tea..
Lens cap as a shutter, never thought of that either.
Wow a random thought that popped into my head last night had so many variables in answers.
Thanks all.