Originally posted by frogoutofwater ... more time on the ground earlier and later in the day, than some cruises, if that makes a difference (not sure it does).
Yes, it can make a big difference. On regular cruises, one usually gets the Golden Hours and Blue Hours (the best time for photography) only at sea.
Originally posted by frogoutofwater We are planning to bring at least 3 bodies: my two K-3s and his K-5IIs (and maybe his K-30 as back-up). And we are thinking that our set-up will be to walk around with 3 bodies - one each equipped with the 55-300 WR zoom and the third reserved for the prime of choice, depending on the circumstances (e.g., the 300mm + teleconverter if we need a longer focal length, a macro, or a wider lens.
In the longer range we already have two 55-300 WRs, the 200mm 2.8, and the Sigma 120-400, the Pentax 50-135 2.8, and the Pentax 1.4 teleconverter. But that Sigma is huge, hard to hand-hold and it's not weather-resistant.
I am limited as to what I can carry (bad back and a gimped right baby finger), but Mr frogoutofwater will chivalrously carry some of the load.
What do you think? Bring on the justifications
And maybe someone can be the voice of reason.
The answer would depend on whether you can tolerate frequent lens changes in the field. If, like me, you prefer to do it as rarely as possible, then the best solution is just two good zooms permanently mounted on different bodies. One would be a tele zoom such as your DA 55-300 or Sigma 120-400, or better still, a DA*60-250, and another a "standard" zoom such as DA 16-85 or one of the 17-70 lenses. With this combination, all your basic photographic needs will be covered, and the risk of contaminating the camera with dust and salt, and losing the critical moments, minimized.