Camera suggestions

[JuklicekCZ]

Hello, For over a year I've been a cannon shooter, I currently own a 850D and recently I got an R7 for a nice buck.
However, I'm not sure about my cameras, I feel like I wanna FF sensor and I'm getting really confused about the market given the fact, that the amount of cameras on sale is so huge.
I guess I dont mind selling my cameras and lens park and switching into another system if the new systems makes sense for spotting.
I quite personally like the Alpha A7III mostly because of its BSI sensor and nice high ISO handling.
The reason why I'm not satisfied with the R7 is its small sensor with maybe ridiculously high resolution.
Is there anyone, who could guide me towards some nice camera, that could potentially be obtained on a used market, has good low light performance and potentially a nice array of lenses that are not overly expensive? Is the A7III the way, or shall shall I try some Nikon, or rather stay with the cannon?
P.S. The other fact that I don't like about the recent cannon mirrorless is the fact, that the mount is closed for third-party manufacturers.
Also If anyone advices some camera based on own experience, please put a link to your profile, so I view some shots of the camera
Thanks a lot.

[seahawk]

Nikon D7200
https://www.jetphotos.com/photo/10769115

Nikon D850
https://www.jetphotos.com/photo/10664922

To make the most of a FF sensor you will need a longer lens. So if you currently use a 300mm, you will want at least a 400mm lens. And when it comes to noise, modern noise reduction software will make a bigger difference than the sensor in the end.

[JuklicekCZ]

Nikon D7200

To make the most of a FF sensor you will need a longer lens. So if you currently use a 300mm, you will want at least a 400mm lens. And when it comes to noise, modern noise reduction software will make a bigger difference than the sensor in the end.

Yes, I understand, that the lens will get much shorter, especially toward the long end.
I do have the sigma 150-600 and I do get the fact, that it will no more be a 960 at the long end, but only 600.
Regarding the noise, do you then think, that it is better to stay with the current R7 and obtain some kind of AI De-Noise software, like topaz or DXO Pure raw, and potentially get some R6, R, or something as a backup body later on?
Is it possible that shots altered with such software might still remain JP-worthy without running into overprocessed rejections?

[mahagonny]

The objective question: have you ever enlarged an apsc image and a FF? It doesn't make much sense to buy a new lens.
FF frames of any brand could be good if you don't have very special photographs to do.
I mean does it make sense to buy a Ferrari if you have to go 70mph?
Happy Holidays

[seahawk]

Yes, I understand, that the lens will get much shorter, especially toward the long end.
I do have the sigma 150-600 and I do get the fact, that it will no more be a 960 at the long end, but only 600.
Regarding the noise, do you then think, that it is better to stay with the current R7 and obtain some kind of AI De-Noise software, like topaz or DXO Pure raw, and potentially get some R6, R, or something as a backup body later on?
Is it possible that shots altered with such software might still remain JP-worthy without running into overprocessed rejections?

You are not only giving up reach, you will also encounter new problems like bad corner sharpness and much stronger vignetting. To remedy that you usually have to step the lens down a bit. In theory it could be that you can get useable images on the APS-C sensor shooting at F6.3 while you need to step down to F9 to get useable images on the FF sensor. If that happens, the better ISO+ performance of the FF camera will be largely equalized.

The other question is how often you can use high ISOs for spotting. When do you need ISO400+ and still get pics with a decent contrast? It would only be interesting for action shots at night, but there the noise reduction software is used any way.

What you generally can forget is using a FF sensor for spotting and finding cheap lenses.