On Fri, 14 Sep 2018 16:10:33 -0400, wrote:

Seems to me that FF is all about connectng back to the old 35 mm film
format, and very little else, since smaller sensors with the same
pixcel count in conjunction with shorter lenses could do the same
thing, BUT smaller and lighter. What part have I got wrong ?

It's more complex than that. Camera and lens size affects things like
number of pixels, light sensitivity, noise, depth of focus, lens
diffraction and hence the final image. Some strive for this, others
strive for that, and if you are struggling for a particular image
quality you may find (suspect?) that one size of camera may be more
suited to your needs than another.
--

Regards,

Eric Stevens