Is color print film shot at box speed?

What works for others answering your question is not necessary going to work with you. As I reiterate here time and time again, your own experiments will determine what is right for you. Everything else is just a guide and insight.
I've been told that Portra has been shot at 1600 and looked fabulous for it. But negative film is not my forté: I like being roughed up with E6 and don't take box speed as gospel.

Rudeofus said:

Looking at the second thread, I really wonder whether Stephen tested some film with ISO 71 or whether box speed was actually 100.

Just asking ...

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I think Stephen's test should be read like this:
made 100 (that's not 100 ISO, it's 100 as an arbitrary number) the speed of the film if developed as soon as exposed, the speed of the same film if exposed after 7 days is 71.

This speed (71 after one week as opposed to 100 immediately after exposure) is actually the real ISO speed as indicated on the box. I infer this because Stephen says, in his text, that the ISO markings keeps into account the speed loss, for commercial film, resulting from 5 - 10 days from exposure to development.

After four more weeks, the sensitivity is still 65, or, if you prefer, 65/71 of the box speed.

That's what I gathered. Maybe Stephen will like to clarify or rectify.

Fabrizio

RPC said:

I have never found any of these to be a problem, and in general I believe the benefits of a little overexposure outweigh any risks.

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That truly depends on the type of shooting involved.

It's print film for heaven's sake!! You don't even need a meter.

Box speed. Period.
It can take 1/3 of a stop over exposure, but there is so little difference why bother?

Generally manufactures know more about their own products than the customers do. Even more so with film.

Sirius Glass said:

Box speed. Period.
It can take 1/3 of a stop over exposure, but there is so little difference why bother?

Generally manufactures know more about their own products than the customers do. Even more so with film.

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I doubt very, very much an 0.3 stop difference is visible at all in print film. But it will be very obvious in transparency — up or down, to a trained eye.
With NPS 160 I routinely shove it in my XA and rate it at 400.

I shoot at box speed normally, but sometimes I want a slightly different look out of my film so I will underexpose and push it in development or make some slight change. Really it's all about what you are going for with your film. I am using film as an artistic medium so I don't necessarily want it to look "perfect".