Quote:
Originally Posted by Camelopardalis
Some of the Sony sensors used in their own cameras in addition to some of those used by Nikon and Fujifilm exhibit a property called ISO invariance. This means a shot can appear to be underexposed but when stretched it doesn't exhibit wild noise artefacts. Most traditional camera sensors (including those used by Canon) do not behave like this, and you need to expose sufficiently using the desired gain (ISO is just gain) to get the results you want. If you underexpose with one of these and then stretch, you'll also be stretching the noise and it'll look much worse than a picture from an ISO invariant sensor.
Your D750 has a sensor that is ISO invariant...I'd go with that rather than spending anything on another camera.
That's not to say you can't get great results with a lesser/cheaper camera...many of us do  it just takes some road testing to understand how to achieve the best results. |
Aaaaah, okay. That's the best explanation yet. I've only ever used Nikons so maybe that's why the concept of the best ISO not necessarily being the lowest is foreign to me!
Yeah I'll have a go with what I have already - might be able to crop by less than a factor of 1.6 anyway, depending on what OTA I end up getting (once the finances recover from whatever abuse the mount wreaks).
Cheers, thanks for that.