| Joined: | Mon Apr 2nd, 2012 |
| Location: | Carthew, Cornwall, United Kingdom |
| Posts: | 6874 |
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ISO at 6400 is very high. That is the max limit that I use for my D3S, Z7, D500 and D850. These are newer cameras with better EXPEED electronics.
Regarding the AF I can suggest a test that may lock this down to either lens or camera.
Take a look at this url and test as described.
https://www.lensrentals.com/blog/2010/11/how-to-test-a-lens/
Look at step2.
You can substitute a newspaper or a magazine page for the testing.
I use this method.
http://www.zen20934.zen.co.uk/photography/LensTests/simplemethod.htm
This is an alternative method.
https://backcountrygallery.com/lens-sharpness-testing/
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Still learning after all these years!
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