It is good that you ask :)!

Read this: https://arxiv.org/abs/2406.02965

The tldr:

Negatives should be 'things that appear in the image' .

If you prompt a picture of a cat , then 'cat' or 'pet' can be useful items to place in the negative prompt.

Best elimination with adjective words is with 16.7% delay , by writing \[ : neg1 neg2 neg3 :0.167 \] instead of neg1 neg2 neg3

Best elimination for noun words is with 30% delay , by writing "\[ : neg1 neg2 neg3 :0.3 \]" in the negative prompt instead of "neg1 neg2 neg3 "

The author of the above question... in addition, a listing of camera attributes that t2i generators take into account, as I am having some problems trying to introduce a list of aperture setting related depth of field options?

I'd just google it. 🤷

Something to bear in mind though is that in general, the fewer prompt terms, the better. You can have gargantuan, monolithic walls of text as prompts and negative prompts... which will take more time for the engine to process and generate from, and is more likely to produce the weird artefacts you're trying to avoid.

Just something to think about.