How good is the manual white balance on the Panasonic cameras (especially the GHx series) for underwater use? Can you get rich colors without a red filter? If so, how deep?
How do the Panasonics compare to the Canons? (I've seen some excellent white balance results without a red filter from the 5D Mark III -- can GH4 do similar)
What about compared to the RX100? I have an RX100, and the manual white balance without red filter doesn't produce very good results below 5 meters or so. Are the panasonics/canons better? Or do you need a red filter with all of them?