I was just researching pictures that have been taken on Velvia 50 rated at different ASA, since this is what I am going to do soon.
I stumbled on a few photographs from Pedro Fonseca which I find quite good (both the content and the outcome of the processing).
Under all the Velvia 50 photographs which he shot at ASA 400 (Example), he wrote "developed push +2".
What does he mean by that? Did he rate the the film at ASA 400 and pushed it another two stops? It doesn't look like it.
Unless he underexposed by two stops and then pushed them back in postprocessing. But the photographs would show more grain, wouldn't they?

I'm looking forward to your explanations.