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Fuji Velvia 50


I recently purchased some of the new Velvia 50 in the 120 size for use in my H1. With the old Velvia I achieved satisfactory results when I rated the 50 at 40. However, when I've used the Velvia 100 I used it at 100 with good results. My question: should I rate the new Velvia 50 at 40 for best results? Hope that I've phrased my question clearly and that someone has experience with the new Velvia 50. Thank you.
Roberto, I did not yet use the Velvia 50 on my H1 system but did so on my Leica 35mm cameras. I never used the Velvia 50 at 40 ASA since I found the color saturation of the Velvia 50 at its nominal speed already strong enough. Not sure if that helps, I believe it is rather a question of personal taste.
I believe the correct EI one chooses depends entirely on how one's meter is calibrated, and on one's own subjectivity. In other words, it is futile to ask anyone else what their working EI is, or for anyone else to suggest a working EI based on their own meter - unless, of course, you are both working with the same type of camera or hand meter. In this case, one could only presume that two similar meters from the same manufacturer would be calibrated the same (and I find they usually are), but even here, there's always an exception.
I can only recommend that you run a couple of rolls of test film, rating the film @ 40, 50, 64, 80, & 100 on several different "normally" lit scenes. Then, on a light table, choose what you consider the best exposure from each set. Use a quality loupe to be sure you have detail in all the highlighted areas where you want detail. If you are using studio strobes, do the same thing with your strobes on an appropriate subject model. You will most likely find that all or most of the choices you make will be the same EI setting. That should be your normal EI setting for this film.
I personally have owned cameras and hand meters that used EI's of 50, 64, 80, and 100 for Fuji Velvia 50.
With my PME51 Hasselblad meter and focusing screen, I had to rate the old Velvia 50 @ 100 EI in order to obtain a "normal" exposure. With the new Velvia, which I just recently shot my first few rolls, I found EI 100 to be just slightly darker, but still very useable with good detail in the highlights. However, I will rate it @ EI 80 next time.
Also, I've always been amazed at how many photographers do rate this film @ EI 40. In all the meters I've ever owned - Nikon, Contax, Mamiya, Hasselblad, Minolta, Sekonic, Gossen, to name a few, not one has ever required me to use an EI slower than its rated 50 speed. But I'm very careful with my chosen EI's, that under normal lighting conditions, I will not encounter any blown-out highlights.
Thanks to everyone for your helpful responses. Since posting my question I found an article re using the new Velvia 50 in the December issue of Shutterbug. My question was fairly well answered: 40 was a desirable speed to use with the old Velvia 50, as I and virtually all of the pro photographers I know so used it. With the new Velvia 50 the article states that rating it at 50 produces the best results. That's about all the input I could possibly hope for. Next week I'll be in Florida displaying my work at the Coconut Grove Art Festival. After the show I'll spend a couple of days in the Everglades using the new Velvia 50 rated at 50. I'll simply have to find what works best for me.
Roberto, I thought I'd add one element to your deliberations.

Not too long ago I got caught out being "too smart by half". By this I mean I was using my own film speed evaluation of a film and setting the camera accordingly for an important shoot.

But, because I am used to taking a variety of light measurements of scenes to judge the optimal reading; and / or when I am using a metered camera I am used to pointing the camera more towards the area I wish to bias the expose for; I feel into the "too clever basket". I made the error of making the exposure judgements despite the adjusted film speed from the nominal speed I had made too - I got myself absolutely confused and probably got the same exposure well matched to the film used that I would have got had I just used my own judgement. Too smart by half!