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I was looking to purchase the Sunpak PZ40x for my G6. I know people are
using it with good results, but when I went to the sunpak site
(http://www.sunpak.jp/e/products/pz40x/index.html) and looked at the
compatibility chart for the G6 there are some features that do not work
with the G6. Such as:
Shutter Speed Control
Flash Ready in Finder
Flash Compensation

I was wondering if these limitations would pose a big problem?

I geuss what I really want to know what these features do. I would like
it to have the flash sense focal length & adjust for it. Do any of the
features that are not suppoted for the G6 affect what I need?