Re: lens questions

From: Jeff Sumner ^lt;[email protected]>
Date: 07/06/05-07:35:00 AM Z
Message-id: <F7FA21AC-71E4-4110-928C-1A55475D349A@mindspring.com>

On Jul 6, 2005, at 2:31 AM, Barry Kleider wrote:

> Last week, I was shooting some welders.
>
> My ultimate goal was to shoot them with a Hasselblad and a 150 f4
> lens. (No internal meter.)
>
> Since these exposures are obviously tricky, I started with my Nikon
> D-1 and a Tamron 28-70 f2.8
>
> I was getting some decent exposures - nothing great, but certainly
> within tolerance for a first attempt. So I decided to switch over
> to the Hassy using the same readings.
>
> Since the Nikon was running at ISO 200 and my provia is 100, I gave
> it a full stop. I got the lab results today: $%#^$%. (Translation:
> way too dark and looks like s**t.)
>
> So my question is: what's the relationship between a medium format
> Hassy with a 150 f4 lens, and a 35mm Nikon with a 28-70 f2.8 lens
> (running close to 70 if not full on)?
>
> I assume there's a very straight-forward (though possibly hard to
> follow) explanation having to do with the difference in lens
> designs rather than a format comparison or a digital vs. analog
> thing (as my lab guy surmised.)
>
> Barry

Lens speed and shutter speeds are constants between the format.
Measuring with a meter through one in any format will work fine in
another, depending on what you are metering.

You say the prints are too dark- how do the negatives look? Are they
thin? Did you take pictures metering with that actinct light from the
welder? That brightness can easily fool the folks doing the printing
(or much more likely, the machine doing the printing)

f-Stops is f-stops.
Received on Wed Jul 6 07:35:23 2005

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