Jim,
Not to confuse your options, my daughter and son-in-law took a National Geographic Expedition ship to Antarctica a few years back. It was run by Lindblad, one of the most revered expedition leaders. It was a photographic centric trip, with guides giving advice along the way. Given your love of photography, I think you'd love this king of trip. After each day, the guests came back to share photos and receive advice from the experts on how to improve. There was even a lending library of photographic equipment to borrow if desired. It sounded unbelievable. I don't think you'd be disappointed.
I'd also like to add my appreciation for all your Live posts. I learn so much from you and now have a desire to visit destinations that I never thought I'd consider. I know the time involved in writing - it's truly a gift to the CC board.
All the best for the New Year - Kathy