Originally posted by DJDee Thanks Savoche. My apologies for not being more specific with what my plans are - everything is still up in the air. I know we plan to do a couple of safaris, visit Victoria Falls/Devil's Pool, Capetown, etc. We will be staying for a month so I guess I am looking for a versatile kit that will be useful for almost any situation (except maybe low light indoor).
I have been considering the 55-300, but we may be doing some early morning/late evening excursions and I have concerns about the speed. Are those ill-founded?
well you are in the world of two extremes. first, I've never felt happy the ultra wide perspective of the DA15. I know it makse big panoramas but the distortion started getting to me. and it was not wide enough at times. so I ended up with a sigma 10-20 for the really wide.
the other end is safari, where you can never have enough MM. 500mm makes you wish you had 600 and 600 makes you wish you had a 1.4 TC.
I personally think the 20-40/60-250 kit is nearly all inclusive but add a DA*300 and leave a 1.4 TC permanently attached for the safari. since you seem intent on all pentax and all weather sealing, that's probably the best way to go.
NOW, if it were my trip, I'd do things a little differently because I find weather sealing to be a tad overrated. My go to lens is the Tamron 17-50, to the point where the 10-20 stays home a lot. if I need panoramas, I stich purposefully taken shots together in photoshop. next, I'd take a Sigma 50-150 (the 50-135 SDM is tooooo slow and unreliable)(I've owned both and like the Sigma alot) and the final lens I'd take would be the Sigma 500 (or Pentax 560) with a 1.4x TC. My budget won't allow the 500's just yet which is one reason the safari is still a couple years away. But I just can't imagine having anything LESS than 500mm for safari shots based on everything I've read. Yes it's big and bulky, but you aren't going to get "zoo" close to anything most of the time.
As far as the DA 55-300. No. Just no. Slow, inaccurate focus and mid level IQ. I don't know how often you get to go on a safari, but for me it would be a bucket list trip. There's no way I'm taking a consumer level zoom with me.