Rongnongno Loc: FL

Actually the moire at this resolution is hard to create.

D800 to D850 = Quantum leap. The two are not comparable.

therwol Loc: USA

The D800 has an anti-aliasing filter to reduce the risk of moire. The D850 does not, but the risk of moire is actually low. Moire is caused when a digital camera cannot capture the fine detail in a repetitive pattern. Higher resolution in a sensor actually reduces the possibility of moire. I wouldn't really worry about it.

The D850 was at or near the pinnacle for autofocus accuracy and speed for a DSLR. There is still some demand for it, though probably waning with the availability of mirrorless cameras that take everything to another level.

CHG_CANON Loc: the Windy City

I would have considered a new(er) DX body for my DX lenses. But, maybe that's just me? I'd have looked at my computer and edit software, before dumping money into an FX body needing FX lenses. Again, maybe just me....

As a 7-year old DSLRosaur, hopefully, you purchased at a used & discontinued discount price, saving money for the necessary lenses. If you have nothing FX, I'd start with the 24-120 f/4 VR.

Dean37 Loc: Fresno, CA

I am sticking with my Nikon D100, D200 & D300, using my FX lenses for now, but looking at possibly buying a D810. Paul, the FX lenses are better on a DX camera than on an FX camera and I am sure you know why.

Rongnongno, hey, my 1992 Chariot (pickup) gets me where I want to go when I want to go. Takes a bit of gas, but I don't worry about getting there. It has handles to roll up and down the windows A/C, a stereo DVD player, Cruise Control and I used it to move 150 miles from where I used to live. The Mercedes sits in the garage unless my wife wants to drive. I enjoy your YouTube videos. Keep up your good work.

CHG_CANON Loc: the Windy City

Why not the final, best, and already ancient D850? Or, in the 24MP format, the best and almost last D750, if / when you really get the FX itch?

rpm Loc: Houston, TX

Well, I know I did not. I purchased it new from Best Buy. I'm sure I could have looked around for a less than prime body, but money isn't always the issue... Will be sure to look for some used lenses for the D850.
Mr. Canon, I've always wanted to tell you, you look exactly like a Max Reichenthal. He owns Texas Iron & Metal on Lockwood here in Houston. He's retired now, but his daughter runs it. But you look just like Max!

CHG_CANON Loc: the Windy City

Lucky for Max!!

Look to KEH and MPB for used lens options. Have fun!

Dean37 Loc: Fresno, CA

I just have lesser GAS and don't see anything that I really need even in the D810 and the capabilities of the D850 are so far above my needs that it would be a waste, though I have considered it. At 86, I am relying upon things that I enjoy with minimum effort and that is part of a reluctance to get the latest and greatest.

I have used a friend's D750 and it was much more complex than I was comfortable with for the time. I have considered the D750, but for some reason the D810 seems to be more of what I would like. I did handle one for a few days, but didn't think it was right at the time.

I do revert to my F3, F4 and F5 on occasion to force me to relearn the basics.

Retired CPO Loc: Travel full time in an RV

I'm not sure where you are coming from. This post was in response to USER ID.
No, I'm a big boy, I don't block anyone!
I always mean well! Unless I'm just kidding around! But I don't always come across that way! Something I need to work on!
I don't remember giving anyone grief about the number of posts they make/have made. But I'm an old fart, turned 70 this month. The memory machine has been used hard and put away wet many times so...
The only suggestions I can give you are, The D850 is a GREAT camera! But, even after you have paid for it, it doesn't come free!
You don't HAVE to use Full Frame lenses. But you don't do yourself any favors by saving a few bucks using DX lenses on that expensive piece of fine engineering! I've had mine for about five years now. It has taken that long for me to acquire the full stable of FF lenses.
I don't know what kind of photography you are into. If you do wildlife/birds, I highly recommend the Nikon 200~500 f/5.6. I took it to Africa a few years ago and could not be happier with it!! Yeah, it's heavy. But it's worth twice what Nikon wants for it! Don't tell them I said so! I DO NOT recommend Tamron big zooms. Been there, done that. Have the tear stained handkerchiefs to prove it!
And, of course the 24~70mm and the 70~200mm. And you can go from there!
And finally, poor technique shows up immediately with that 45meg sensor watching everything you do!! Use a higher shutter speed than you are used to. Use the lowest ISO that you can, to get the job done! Although the 850 handles higher ISO pretty well. Roll your finger across the shutter button rather than jabbing at it.
Just remember, if you go running and gunning and forget about technique, you might as well have stayed home!

Indiana Loc: Huntington, Indiana

The best way to learn the D850 is to locate someone who has this camera and will agree to meet you to learn its functions and answer specific questions. I read a lot, and find most manuals to be limited, inaccurate, and lacking.
(one of the reference books mentioned earlier had so many errors that I wrote the author, pointed out the errors with the proper correction included. He sent me a nice letter thanking me for the proof reading, and assured me the next addition would have the errors corrected...and they were).

therwol Loc: USA

A used D810 will cost you less than a new or used D850. If you're not trying to track fast moving subjects, you won't be able to tell any difference in the pictures those two cameras take unless you're into pixel peeping, and even then, the difference is subtle. The D810 is a VERY quiet camera for a DSLR. The D850 is not.

I went from a D810 to the D850 and consider it money wasted. If I were going to truly upgrade, I'd go mirrorless, but I'm at a stage in my life where spending a lot of money on cameras and lenses doesn't make any sense.

therwol Loc: USA

The 70-200 f/4 VR is a good alternative to the 2.8 lens, just as sharp, significantly lighter and less expensive. It has been discontinued, but there are used copies out there.

https://www.bhphotovideo.com/c/used/897230/?cnxclid=17107954762390155609214661190008005

cbtsam Loc: Monkton, MD

One thing the 850 has that neither the 800 nor the 810 have is Focus Shift shooting, where you can put the camera on a tripod and tell it to make up to 300 exposures, shifting the focus forward a small amount each time, helping you make focus stacked images. I had thought about using an adjustable device on the tripod to manually advance my 810, but I evidently lack the discipline for that sort of work. So I got an 850, and have enjoyed it enormously, with many focus stacked images since. It is a wonderful feature if you like to get close. If you'd care for an example, check

https://www.flickr.com/photos/samyaffespix/51142721383

MichaelMcGrath Loc: Ireland

If you keep a prime lens up over one two fiftieth, it need not be VR.

rpm Loc: Houston, TX

Mr. Indiana,
I totally agree. I'm going to see if Baytown Photography club is still active & if not surely one can find another photo club here in Houston to attend. Thanks, rpm