Country Boy wrote:
Most of my previous photography has been people. Some things like family gatherings or business presentations for publications or some general shots which would be classified as landscape. That said, this summer I want to tour the state and take lots more landscape and also want to get into wildlife photography. I know I could get a D500 and use all the same family of lens used on the D7100 but I thought I would get a FF camera and more of a second camera than a replacement.
Full frame would be nice for portraits and for landscapes, though the 24MP resolution of the Z6 and D780 isn't much for landscape photography. It's also not all that different than what you've got now in your D7100... granted, it's FX vs DX and newer versus older sensor/processors... but it's still 24/25MP across the board. Especially for landscapes, if you're gonna jump to full frame, it sure would be nice to have at least one of the 36MP cameras, if not 46MP!
The problem is, those 36MP/46MP FX cameras are a lot more expensive! The cameras you asked about cost $1850 (Z6) and $2300 (D780). 46MP Z7... $2500. 46MP D850... $3000. Oddly, 36MP D810 is also $3000.
Plus, you mention wanting to get into wildlife photography. For that, you might want to hang onto your D7100 or upgrade to a newer DX model. Otherwise, to shoot wildlife with an FX camera, you're gonna need a bigger lens! If you're using a 300mm or 400mm now, start looking at 500mm and 600mm to use on the FX camera!
Maybe there's an alternative....
How about doing both DX and FX? Sounds like might cost too much, but maybe not.
Even refurbished D810 are still $2400 at Nikon USA... but I found two used ones at B&H for $1150 to $1250 (same warranty as Nikon USA refurb, I think). Prices are similar or less at MPB.com (don't know if there's any warranty). Might be worth a look at KEH.com, too.
This would get you full frame and still leave a lot left over from your original budget.
If you still wanted it, you'd still have enough for a moderate DX upgrade for your D7100 too. I really think you are going to want to keep a DX camera in your kit for wildlife photography. The alternative is to haul around bigger, heavier, more expensive lenses for use on an FX camera... or give up on "reach". I think the D7200 is worthwhile, though only you can say if it's enough difference from your D7100.
One of the primary complaints about the D7100 was its small buffer. The D7200 pretty much solves that, although the much bigger buffer of the D7200 isn't mentioned in most "on paper" comparisons.
The D7200 maintains the 24MP resolution of the D7100, but uses a newer sensor and/or processor, giving it the best dynamic range and color bit depth of any Nikon DX model. It's also got a much higher ISO range, although only you can say how high you're willing to use. It's nice to have the option to go higher than the D7100's ISO 6400, if you wish.
The D7200 also has an improved AF system too... able to focus in lower light. That might complement higher usable ISO. It's also more efficient, Nikon rates it to be able to take 16-17% more shots per battery charge. It's got various other tweaks. Enough to make you want an upgrade?
https://cameradecision.com/compare/nikon-d7100-vs-nikon-d7200https://www.apotelyt.com/compare-camera/nikon-d7100-vs-nikon-d7200https://www.imaging-resource.com/cameras/nikon/d7100/vs/nikon/d7200/D7200 is no longer commonly found new.... But refurbished are available. B&H has them for under $700.
So you could potentially get both a 36MP FX camera (portraits, landscapes and more) *and* a DX upgrade (wildlife and other telephoto work) for the around the cost of the Z6 alone, or less than the cost of a D780 alone.
Note: D7200 doesn't have the frame rate of D7500 or D500, nor the AF system of the D500.... but it has better dynamic range, a little more color bit depth and more resolution. The D7500 and D500 are both 21MP cameras. Some folks thing D7500 wasn't an upgrade in some other ways, too.
Just a thought.