My best tip would be to manually focus. Some people say, to focus before you put the filter on, but in my experiences, the focus shifts after the filter is put on, and it won't be as sharp as if you focused manually. Just my opinion though, I guess putting the filter on after works for some people, but it hasn't for me, so I stick to doing it the hard way. It can be a bit tedious to focus manually with a G2, but the results are much better in my opinion.
Also, I would say as you start experimenting, begin shooting in aperture priority. Open it up, and focus. After you get accustomed to your exposure requirements with that filter, you'll probably get better results shooting manual. With the filter on, I usually know better than the camera on how to set the exposure. I usually let the camera meter, then adjust the exposure +2/3-1 stop.
At such a wide aperture, you may have to take two shots... one focused for the foreground, and one for the background. Then blend them in PS. That's the only way to get a large DOF with such a wide aperture. That's what I did for this shot
. I didn't start using that technique until I got kind of bored with IR, so a lot of my earlier shots would have been better had I used it. Oh well, live and learn. I'm sure I'll get on another IR kick someday.
Oh, of course, ALWAYS use a custom white balance. Much cleaner images, and it will help to reduce exposure time. Have fun.
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