- Joined
- Dec 19, 2017
- Messages
- 3,358
Thinking about how I work with people and some other subjects I've favoured wider angle lenses. with my Mamiya 645s it's nearly always the 45mm WA which is roughly the equivalent of a 90mm on 5x4. while that goes against the common notion of a portrait lens being slightly longer than normal it works, and after all many photojournalists were shooting with a 28mm on 35mm cameras.
I know I've worked at f5.6 with my Mamiya's 45mm lens and had quite shallow DOF, it would be much the same with a 90mm on 5x4 at f8, most modern 90mm lenses are f5.6 or f8 although the Rodenstock Grandagons were f4.5 or f8, older 90mm lenses tended to be f6.8.
It's a balance, a longer lens at wider apertures will render the background way more out of focus than the two example, which is why a portrait lens for a 5x4 would typically be around the 210mm/8" focal length, Cooke's PS945 portrait lens is 229mm/9". The term environmental portrait comes to mind to describe the examples.
Ian
I know I've worked at f5.6 with my Mamiya's 45mm lens and had quite shallow DOF, it would be much the same with a 90mm on 5x4 at f8, most modern 90mm lenses are f5.6 or f8 although the Rodenstock Grandagons were f4.5 or f8, older 90mm lenses tended to be f6.8.
It's a balance, a longer lens at wider apertures will render the background way more out of focus than the two example, which is why a portrait lens for a 5x4 would typically be around the 210mm/8" focal length, Cooke's PS945 portrait lens is 229mm/9". The term environmental portrait comes to mind to describe the examples.
Ian