Originally posted by normhead Barely bigger at all if that holds up.
Nikon D750
840 gm, 149x113x78mm
Temperature: 0 to 40°C/32 to 104°F; humidity: 85% or less (no condensation)
K-3
1240 gms, 132 x100 x 77mm
Operating temperature: 14-104°F (-10 to 40°C)
Weather resistant: Yes (92 special sealing parts)
I'm not seeing the D750 as in the same leagues as a K-3 in terms of out doors, and having had two cameras covered with condensation on the last few nights, I'm not so sure about leaving a D750 out where there might be condensation for star trails. So an extra 400 grams for weather sealing, a much lower operating temperatures.
There are a few things missing from the D750 I wouldn't trade weight for. Since I regularly use my camera in -20 and moist conditions.
I can't ever remember a K-3 breaking my back, , in fact I can't remembers a K-3, DA 18-135 and DA*60-250 ever breaking my back... but, I guess all backs are different.
Image with dew covered lens and camera... I kind of like it.
With Pentax, no worries....
You do have a very good point. The D750, and also the Canon 6D for that matter, lack quite a bit in the ruggedness department despite their magnesium alloy frame, and ambiguous weather sealing, that usually makes "common" users see them in the same league as the more flagship bodies.
Then again, in my previous comment I had mentioned that I fear the full-frame camera will wind up being heavier than even the likes of the Nikon D810 and 5D mk3, cameras which may not have the exact same temperature ratings, but are at least proven to be professionally reliable.
Still, I will happily lug a heavier camera all over kingdom come, for certain jobs. My friends and I have lugged various cameras up all sorts of mountains, including Mt Whitney in the Sierras, and some obscene 2+lb lenses such as the Nikon 14-24 and the Tamron 15-30.
So, when the job requires it, my back can handle it. My knees, though, are a different story unfortunately. For me, each extra pound really does matter.
Then again, I know I can make up for it by taking advantage of the amazing, lightweight primes that Pentax offers, both FA an DA, many of which are probably as many grams lighter as however many grams heavier a body might be. I'd rather opt for a Rokinon 14mm than a Nikon 14-24 or Tamron 15-30. I'd rather opt for an f/4 zoom than an f/2.8, for landscapes. And so on and so forth.
While we're on the subject of weight saving, I have also been known to happily "compromise" with a crop-sensor camera, even a beginner one, for lighter weight adventures when I want to bring 2-3 cameras, or when I just want one and I'm really just going lightweight. And in that regard Pentax also wins, since they're the only ones putting weather sealing in their beginner cameras; even the K-S2 is weather sealed if I am not mistaken, for "only" 21 oz.
To that end, Pentax definitely wins across the board, even if the K-3FX is a tad heavier than a Nikon D810 or Canon 5DsR.
;-)