Thanks Martin...Yes, more dynamic range would be nice. I find the negative to be quite thin...and after scanning, the histogram is a bit scrunched up in the middle. Here is another image I took. This one is even longer in exposure, I need to look up my notes, but my memory says its about 4 minutes after taking into consideration reciprocity failure of the GP3 film. I am playing with the GP3 as my first box of film as it is rather inexpensive...working out to about USD 1.50 per sheet of film plus developing chemicals.
I think there is a bit of a light flare on the right of the photograph probably through the lens. Also the image is not critically sharp, as I realised after the fact, that the bridge I had the tripod on was not completely rigid, and vibrated when pedestrians walked by.
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What are faster films for 4x5? HP5? Portra 800 is a bit expensive at this stage of experimentation, though I have a box of Provia in the freezer.