Thanks for clarifying what is equivalence. To a more easily understood, I would rather call it as the reference image. I have Canon and Sony systems because I used to own a photo event company and I also used to have a Professional photo lab where we have worked with photographers to produce award winning images. That is why from the beginning, I already said that there is definitely a drop in IQ and a compromise in DOF when using smaller formats, because I have done actual comparisons before.
Over the years, I have come to realize that sometimes, it is more important to be practical than to see perfection. This is why Large Formats and Medium Format are slowly being phased out. Remember those 80 megapixel medium formats back? Full Frame SLRs can hardly match their quality even years later. Why did they not become popular? Why did Mirrorless overtake DSLR even though the viewfinder experience sucks on most of them? Why did mobile phone cameras became the most popular format?
Equivalence may be the reference to a perfect image, but it could amount to nothing if the set up needed to take the shot is not practical (be in in terms of cost, weight or size).
Over the years, I have come to realize that sometimes, it is more important to be practical than to see perfection. This is why Large Formats and Medium Format are slowly being phased out. Remember those 80 megapixel medium formats back? Full Frame SLRs can hardly match their quality even years later. Why did they not become popular? Why did Mirrorless overtake DSLR even though the viewfinder experience sucks on most of them? Why did mobile phone cameras became the most popular format?
Equivalence may be the reference to a perfect image, but it could amount to nothing if the set up needed to take the shot is not practical (be in in terms of cost, weight or size).