If you are talking about digital cameras that we have in Max, then yes focal length can lose it's purpose with perspective corrections.
I don't understand this sentence.. what perspective corrections ? Tilt/Shift is the only correction available to 3dsMax physical camera, and it behaves exactly the same way as Tilt/Shift lens in reality, with exception of having no limit. Lens distortions on other hand aren't connected to perspective and are also simulated in same way.
(I didn't count vertical correction, as it's not simulation of optical effect and correctly shift should be used instead)
There is no difference to how the camera works in 3dsMax and real-life in any facet, except for having complete control over every aspect that would otherwise be physically limited by camera and lens construction. (and the option to bypass these limits and disconnect depth of field and motion blur from exposure constraints)
But in real life it is different perspective for different focal lengths.
Definitely not, but I won't go further into off-topic, Romullus explained it very well. Nothing to do with vanishing point. This is common incorrect argument people make on photography forums like DPReview. I've read few of such threads, never goes well :- ).
« Last Edit: 2017-09-03, 16:56:18 by Juraj_Talcik »
Logged
Please follow my new
Instagram for latest projects, tips&tricks, short video tutorials and free models
Behance Probably best updated portfolio of my work
lysfaere.com Please check the new stuff!