On 29/04/2015 14:35, whisky-dave wrote:
On Wednesday, 29 April 2015 14:21:57 UTC+1, Fredxxx wrote:

snip

One thing, that surprises me if you claim to have expert knowledge in
the field,

which I don't, most is common sense and knowing a little bit about it.


.is one advantage not having a pentaprism and mirror
combination, it unties the hands of lens designers, leading to simpler
and more efficient lenses.

Lens designers have always strived to improve their designs.
pentaprism and mirrors have nothing to do with that.
most P&S and compact cameras didn;t have pentaprism and mirrors,
but they also didn't have interchangable lenses.

That shows you ignorance of lens design. I can assure you that back
working distance for the lens has a significant impact in lens design.
Generally the closer you can get an element to the image plane, the
better the lens in terms of simplicity and overall efficiency.