@BillN_33 With the greatest of respect, it doesn't matter whether the crop in DX is an illusion, it gives you more pixels on target (until an FF camera comes out with a high enough MP to allow a 21 (d500) or 24 (d7200) crop mode). So at 100% crop there will be more detail (well, more pixels at least) on a d500 or d7200 than on a d810. It's just a fact. With a d750 you'll get even less pixels on the bird and most likely even less detail. Each to their own and if you're happy with the D810 then that's fine, but you can read threads comparing the d500 to the d810 and you'll see that the consensus is that:
- There's more pixels on target
- The AF is better in every way
- Noise is identical
To me, d750 isn't even in the same ballpark, it's not a birding camera (imo) as you just don't get as 'close'. You can see which camera will give more resolution and likely more detail from the size of the resulting image:
- D7200 - 6000 x 4000
- D500 - 5568 x 3712
- D810 DX - 4800 x 3200
- D750 DX - 3936 x 2624
I fully respect that you prefer the d810 but I totally disagree that if you can afford it you should get a d750 or d810. D810 possibly...d750 not a chance.
You, (we) are really discussing kit here and not images?
have you used the D810 or D750 for bird shots Chris?
do you always believe reports on the internet
why do you think that more pixels gives you better IQ or image?
what pixel density do you think you need on a cropped image to give you a good image, especially when most will be reduced considerably in size for internet posting?
Do you print large images?
How many fps do you need.
what sophistication of AF do you need for bird photography - in fact how many modes do you currently use?
Can you translate your quoted figures by posting examples - I have compared images from the cameras that I have mention and my opinions come from that .. the same goes for AF and fps in the field
"I fully respect that you prefer the d810 but I totally disagree that if you can afford it you should get a d750 or d810. D810 possibly...d750 not a chance."
In many ways the D750 is more suitable than the D810 for bird photography, (out of the box the D750 is faster, the physical size is more manageable, it has a slightly better low light performance and the AF is slightly better - points that you seem to value?), but also my view from using both but read the Reports if you prefer .......... but as you say, "the D750 not a chance" ...... not sure where or how you get your opinions.
If you like to take images of focus charts, the D810 takes a clear lead, but I feel that it would also be very good for my Dragonfly shots
but it's hardly worth the argument - we all buy what we feel is best from the information that we have .......... I may even get another D7200 as it is good for travelling with the D750 and it's cheap, both being great value for money!
what I also think is worthy of consideration is the following
Nikon now seem to use consumers as part of their "test bed" - either intentionally or not
The D600/D610 had minor problems on launch . the D750 sorted these and is a development of the D600
The D800 the same, minor problems - the D810 is a D800 with these sorted
D7200 again same procedure the refinement of the D7000
If you buy a D500, based on Nikon's recent history you should expect to be disappointed versus their hype and that the new body/system will have minor problems ..... the D500 is not a refined past model