I should mention, that I do like to take pictures of raptors, Owls in particular and abandoned farm machinery way off in fields, drag racing cars, etc. In these cases I use a lens that is full frame, but I use it on my ASP-C K5 body. It's a Sigma 150-500 and at 500mm ..with the K5 I understand that the lens is the 35mm equivalent of around 750. I like the extra reach with the K-5.
Mostly when I'm traveling I take my K1 and lenses as listed in my Domke bag, as I said in Post # 9, but I also take my Sigma 150-500 attached to the K5 in an old medium format Cullman bag. I try to make sure I take both the K1 bag and the K5-Bigma bag...as out in the country you never know what you will come across and like the Boy Scouts say...Be Prepared.
This last summer, one day I just took my K5/Bigma bag for a day, as I was looking to take pictures of Pronghorn and Elk out on the lone prairie.
Didn't see one, but I did come across a large business yard with a great collection of 1918 to early '50's cars and vintage trucks..even the remains of a '23 or so...Oldsmobile. All I had was my 150-500...so I ended up taking close up pictures...from yards away. It's one thing to be resourceful with what you got...but on other hand it would of been much better to make sure I also had my K1 with 28-105.
If it all possible and if I have the room, etc...I like to have enough equipment...not everything...but enough to have the right stuff in case for whatever I encounter . Mostly I find with a few small primes, a nice wide angle zoom and a good telephoto...I'm in pretty good shape to handle whatever I may come across.