Adrian Van
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The DX crop mode on a D750 FX camera is about 10 MP. The full frame FX mode on D750 is 24MP.
The full DX area of D7200 (DX camera) is 24MP.
To use DX lenses on D750 would only give you 10MP resolution in DX mode, while DX lenses on D7200 give you full 24MP because of pixel density and they cover full area of sensor.
To take advantage of the D750 and full 24MP resolution you would need to buy FX lenses. (mostly more expensive than many DX lenses, except for some primes like 50mm F1.8 which can be $200 and 50mm is a FX and works on DX. All new FX lenses mount on new Nikon DX cameras.)
The advantage of the D750 is less noise at iso of 1600, 3200 and higher 6400 etc., so better image quality in very low light, retaining more detail and less noise when correcting incorrect exposures in post edit softwares.
If you can afford the overall higher price of FX like D750 with FX lens selections, it is clearly the winner in low light photography. However, if mainly an advanced enthusiast photographer or taking photos for extreme distance like wildlife, sports, in moderate light, the D7200 might be the better choice and more affordable solution. Both are capable of great images, keeping in mind the pros and cons of each.
Like comparing apples and oranges, there are differences in FX and DX formats. Both camera maximum resolution is 24MP, though, there are differences in low light image quality though.
The full DX area of D7200 (DX camera) is 24MP.
To use DX lenses on D750 would only give you 10MP resolution in DX mode, while DX lenses on D7200 give you full 24MP because of pixel density and they cover full area of sensor.
To take advantage of the D750 and full 24MP resolution you would need to buy FX lenses. (mostly more expensive than many DX lenses, except for some primes like 50mm F1.8 which can be $200 and 50mm is a FX and works on DX. All new FX lenses mount on new Nikon DX cameras.)
The advantage of the D750 is less noise at iso of 1600, 3200 and higher 6400 etc., so better image quality in very low light, retaining more detail and less noise when correcting incorrect exposures in post edit softwares.
If you can afford the overall higher price of FX like D750 with FX lens selections, it is clearly the winner in low light photography. However, if mainly an advanced enthusiast photographer or taking photos for extreme distance like wildlife, sports, in moderate light, the D7200 might be the better choice and more affordable solution. Both are capable of great images, keeping in mind the pros and cons of each.
Like comparing apples and oranges, there are differences in FX and DX formats. Both camera maximum resolution is 24MP, though, there are differences in low light image quality though.
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