Found this 2015 interview of Steve McCurry where he's asked, "How do you feel about adjusting your pictures?" His response? "I believe that pictures should exactly reflect what you saw and experienced when you took the picture."
Yup!
Here's the video (this conversation from 7:00 - 7:32):
I agree with him. Photos should reflect exactly what we see. So:
- subject of the photo should be the same size in the photo as it is in real life
- no wide angle focal lengths (exaggerate distance compared to the human eye)
- no telephoto focal lengths (compress distance compared to the human eye)
- no black and white or sepia (unless photographer is colourblind)
- colourblind photographer can use black and white or sepia toning but they must refrain from using the channel mixer
- no macro (especially older people who cannot see clearly up close without glasses)
- fast shutter speeds only (no motion blur allowed, unless photographer has consumed a lot of alcohol)
- any hallucinations experienced by the photographer (e.g. due to drugs, insomnia, etc.) must be added into the photograph in post-processing
- no shallow depth of field
- no extremely large depth of field
- lenses with chromatic aberrations are not allowed
- photos must be taken with two different lenses/cameras unless photographer is blind in one eye or at least closes one eye while photographing
- no noise (no high ISOs allowed)
- HDR is mandatory
- no composite photos
- aspect ratio should be approximately 16:9
- no vertically-oriented photos
- no square photos
- no panoramas
- lots of vignetting and soft corners mandatory
- no flash
- no filters such as polarizers and IR filters
In other words, REAL photography only.