What’s the problem with pushing Portra 160 to 400?
...quite simply – because there are films that have been optimised for 400 ASA
It’s just like in real life – whatever it is, if you use it outside its intended operating conditions, you have to accept a drop in quality. Believe me – if your plan were feasible without compromises, Kodak would certainly be promoting this as a unique selling point in their marketing – along the lines of ‘one size fits all’... It’s true that every now and then companies claim their film covers a sensitivity range of four, five or more stops without any significant loss of quality – but they’ve regularly failed to back up their claims...
