Hi,
I bought a Pentax-A 645 55mm f/2.8 and a Pentax 645 to Canon EF adapter.
The a7rii has a Fotodiox Pro EF to E-mount adapter on it.
It all works fine.
My question is about the field of view of the Pentax-A 55mm on the Sony. It's slighly less than what I see through my Sigma 50mm f/1.4 Art.
Why are MF lenses said to be the equivalent to such-and-such a focal length (a wider angle) in 135 format.
Shouldn't the Pentax-A 55mm be 'wider' than the Sigma 50mm?
What am I missing?
Thanks.
I bought a Pentax-A 645 55mm f/2.8 and a Pentax 645 to Canon EF adapter.
The a7rii has a Fotodiox Pro EF to E-mount adapter on it.
It all works fine.
My question is about the field of view of the Pentax-A 55mm on the Sony. It's slighly less than what I see through my Sigma 50mm f/1.4 Art.
Why are MF lenses said to be the equivalent to such-and-such a focal length (a wider angle) in 135 format.
Shouldn't the Pentax-A 55mm be 'wider' than the Sigma 50mm?
What am I missing?
Thanks.