I am about to be in Utah for about 3 months for work, and rather than lugging my full DSLR kit I am only going to take my Canon G15. However with the landscapes and skies I expect to see, I know that I would want to use my (circular) polarizing filter to emphasize the colors. So my only option is to hand hold the filter in front of the lens, but I am not sure how well this will work.
I do have step down rings for the filter which will act as a lip that will slip over the end of the lens barrel by a small amount, and hopefully reduce reflections between the filter and the lens.
However one reason I got the G15 in the first place was that it has an optical viewfinder and I am old school enough to use that all the time. But the hand holding of the filter probably means I will have to embrace live view.
So are there any tips and/or gotchas that people can suggest that I can incorporate into my shooting that will make what I want to do feasible? E.g.,
What should I expect from the autofocus?
Should I shoot in manual exposure and/or focus only?
Has anyone tried this with a graduated ND filter?
Should I use a monopod (at the very least) to help with stabilization?