New answers tagged night-shooting
I'm having similar problems with my E-PM2. I think that you can't escape some trial and error. I was trying to take a photo of someone sleeping in the dark. I found a spot in the room which was enough illuminated to allow me to focus on. I attempted to place myself at the same distance from this illuminated object as I would be from my subject, and focused ...
If your goal is to minimize star trails then the wider aperture is always preferred. The wider angle lens will allow you to get more of the milky way in a single shot, but if you are comfortable and willing to stitch multiple images together then it doesn't matter much. See: How do I capture the milky way?
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