[photo-3d] Re: Velvia

[Chris Schneberger <chris@xxxxxxxxxx>]

photo-3d@xxxxxxxxxxx wrote:
> Great.  The reason I asked is that the Kodak stereo camera
> is notorious for "slow shutter".  In many Kodaks (all I have
> tried myself) the shutter is slower than the indicated value.

Perhaps that's the case in general, but so far mine is accurate

> What this means is that your pictures will be overexposed.
> That's why you feel you have to underexposure Velvia.

No, I've been rating Velvia at 64 for years, in various SLRs.  I'm
intentionally giving it 1/3 stop less light for better saturation.  I also
bracket in 1/2 stops for insurance, but invariably come out with my best
exposures at 64.  My exposure is usually determined by a very accurate Minolta
Auto IV F incident meter, and often checked against the Sunny 16 rule if possible.

> >I've been exposing Velvia at 64 but having it processed
> >normally.  When you overexpose it, are you having the
> >processing altered?
> 
> No.  It seems that quite a few photographers shoot it
> as ASA 40.  It's been a while since I used Velvia
> myself.  I prefer the ASA 100 films.  I find the
> extra f-stop (over a ASA 50 film) quite useful.

The reason I asked was whether an overexpose/underdevelop approach wuld work
for reducing contrast in slide film the way it does for black and white
negatives, ala the zone system.  I can tell you, having shot a lot of Velvia,
as well as other slide films, overexposure will wash out color.  If you're
getting great results at 40, I wouldn't change a thing, but it's likely that
your meter is slightly off.   

On the other hand, with color negative film, I recommend to my students that
they rate it a full stop slower, thus overexposing it.  This gives much better
color saturation on the negative and allows for easier printing and stronger results.

As for 100 vs 50, the extra stop doesn't mean as much to me as the color
quality, and since I almost always use a tripod I don't feel limited by slower
shutter speeds.

Chris Schneberger

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