Here are a couple of images I took when on Crete in the 1980s. My old Canon FT and slide film, probably Agfa. I took a landscape image of this old church to show the trees, then a portrait image to get a bit more detail of the church, so these were conscious decisions taken in camera:
Just to take the point a bit further, here is another image (from the same holiday) taken portrait format with a 50mm lens on the camera, the only one I had with me that day:
I always wished I had got a telephoto lens with me that day, but it’s only recently that I realised I could get a little closer to the church and the priests leaving it by cropping in portrait format – a different dynamic emerges:
So, what do you reckon to all this? Better to make the decision at the point of taking the image, or play about in post processing? Personally I see reasons for both, because you may well decide changing lenses or POV is needed or gives better results at the time of taking the image, which you can do nothing about if you decide to change the format in editing…
More Portrait vs Landscape over at Paula’s here.