I think this is a good exposure, even more so for an early effort! Collodion has a lower dynamic range than film, and it's notoriously difficult to meter for.
This will only work if you have a means of developing on site (see below), but if you want to ascertain exposure, you can do a test plate (essentially an in-camera darkroom test strip).
Stop the lens down to around f/16, and then do a 2s exposure with the darkslide fully out. Push it 20% in and do another 2s exposure, push in another 20% and do 4s, then 8s, then finally 16s on the last 20% of the plate. Develop and fix and you'll have a selection of exposures to choose from, just remember to add them together. Here's
an example test plate from last month.
You might also be interested in this comparison video Borut Peterlin made recently:
https://www.youtube.com/watch?v=vAhhe_c8Yig&ab_channel=BorutPeterlin
Cloudy, overcast days are actually the best for shooting collodion outdoors, you get nice diffuse light.
It's not at all difficult or expensive to make a basic portable darkroom for doing 4x5 wet plate in the field. I've seen people just use an old suitcase and drape their dark cloth over it when they need to use it, I've even made one out of
a plastic tub, bungee cord, and ~4m length of blackout fabric. There is also the turnkey solution of the Ilford Pop Up Darkroom.
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