Originally posted by 08amczb Okey, so for those who has a K-1, but does not has a K-70/KP buying only a DFA28-105 is cheaper, then an APS-C body + a standard zoom. This is a point.
Altough I still think, a recent APS-C body + a standard zoom is more reasonable: you get a second body and it's more compact and light with aprroximetly the same IQ.
That's a valid view-point, but - importantly - it's yours... and certainly not everyone's
Although there are occasions where I take more than one body with me, it's usually for backup in case one fails. So, if I'm shooting with my K-3, I
might take my K-3II as backup. Or, if I'm shooting my Hasselblad HV, I might take the A7 MkII plus LA-EA4 adapter as backup. In both cases, the lenses I carry are compatible and have the same field of view on both the main and backup bodies.
I can see why you might carry a different format body with you, but that means different lenses (if you want to replicate the same fields of view), different batteries, different battery grip, etc. If cost is the main consideration, then it
might work out cheaper, though I doubt it. Most people, I think, only want to carry one camera and one set of compatible lenses for the majority of amateur photography situations...
EDIT: I will say, there are times when an entirely different format and lenses make an excellent addition or alternative to one's main kit. On numerous occasions, I'll carry my Pentax Q7 with one, two or three lenses instead of an APS-C or full-frame DSLR. That setup gives me similar fields of view and decent IQ in a very small package. But these situations are quite different, for a number of reasons, than those where I would happily carry and APS-C or FF DSLR / mirrorless setup...