The D850 replaced my D800 and the auto focus system of the D850 is far superior.
I love the files that it produces and I can't think of a current camera that I would replace it with. Ask me again next year when Nikon brings out the Z8 / Z9.
I have sold two lenses to MPB here in the UK and I have found them to be excellent people to deal with. They arranged for a carrier to collect the item from my home at no cost to myself and once they had confirmed that the equipment was in the condition that I stated it was when they quoted a price the money was paid directly into my bank account within a day.
I have the Nikon D850 and use it with my 300mm PF f4 lens combined with the AF-S TC-14E III teleconverter which gives me a combined focal length of 420mm. I find that there is very little optical quality loss using the teleconverter and I'm very happy with the combination.
I use the Nikon 300mm PF lens with my D850 and it's probably my most used lens. My friend has the 200-500mm lens and I'm not that keen on it mainly due to it's size and weight (my 300PF is about the size and weight of my 24-70mm 2.8 lens and because of this it always travels with me). I also have the Nikon 1.4 III teleconverter which gives me 420mm at f5.6 when used with the 300mmPF with very little loss in optical quality.
I was once told that "rules are for the guidance of wise men and the obedience of fools", and as rules go I think that this is one of the better ones (for guidance only).
When travelling I always take my Sony RX100Mk2 as well as my D850. My wife is quite happy to carry and use the Sony and has taken some excellent photographs with it. I would think that a second hand Sony RX100Mk2 would come within your budget. I've attached a photograph taken with the Sony when we visited St. Lucia.
Understand that the version of Photolab that comes with the Nik Collection is the Essential version. It lacks some key elements that are in Photolab Elite which is what I use as my raw converter/processor. The Essential version lacks PRIME noise reduction, perhaps the best noise reduction available. It also lacks Clearview Plus which is a combination haze and structure tool. The Essential version also lacks the configuration ability of the Elite version and some other features. I would suggest, if you purchase to he Nik collection, that you update Photolab to the Elite version.
Understand that the version of Photolab that comes... (show quote)
I'm a long term user of DxO products and currently use DxO Photolab 2 Elite version (this gives access to PRIME noise reduction which I consider to be one of the best noise reduction applications). I bought the NIK collection when DxO first acquired it from Google even though I had the free NIK collection from Google - I wanted to encourage DxO to continue development of the NIK collection. I'm reluctant to buy the new updated NIK collection because for some reason DxO have decided to bundle Photolab 2 Essentials with it so why would I want to downgrade from "Elite" to "Essentials"? It would have been far better if DxO had offered the pricing options of purchasing just the upgraded NIK collection, NIK collection plus Essentials or NIK collection plus Elite.
I have the Tamron 24-70mm G2 almost pemanently attached to my D850 and I love the output of this lens. Matt Granger tested the Sigma, Tamron and Nikon (not current version) of their 24-70mm lenses in this link. https://www.youtube.com/watch?v=isUilwPJkoc
I find that my D850 is excellent for action shots and find that the tracking and focus never lets me down. I recently went to the Oulton Park circuit for a superbikes event and the D850 set to Group Focus, together with the 300mm f4 PF lens made an ideal combination for handheld shots.
I've recently moved to the Godox system from Yongnou (had two flashguns and one failed). I've bought an AD200 and a receiver for my Nikon SB700. The thing that I like about the Godox system is that the Godox on camera trigger is camera brand specific but the majority of the Godox flahguns have receivers that accept the signal coming from the signal whatever the brand of camera. This means that my friend who shoots Canon, who also has an AD200, and I can trigger both units using our respective Canon and Nikon on camera triggers.
I've recently purchased the Godox transmitter and it works fine. I was initially worried when I used rechargeable batteries and saw that the battery meter was only showing 1 bar but on reading the instructions I discovered that it requires the higher voltage of alkaline batteries - once these were installed the battery meter was reading full.
The lenses most used on my D850 are, Tamron f2.8 24-70mm G2, Nikon f4 16-35mm (this lens has a threaded filter mount so I can use my Nisi filter system without having to buy an expensive filter mount), Nikon f4 300mm PF lens and a Nikon 1.4III 1.4 teleconverter which combined gives a focal length of 420mm (the 300mm PF is about the same size as the 24-70mm but weighs less) and a Nikon f4 70-200mm (I had the f2.8 70-200mm and it was a great lens except for the size and weight and because of this was a pain to carry so mostly stayed at home not being used.
The D850 is a fabulous camera but it's not light so it will be worth factoring in the combined weight of the camera and any potential lens.