Hi Boz!
On Thu, 10 May 2001, Bojidar Dimitrov wrote:
> Decreasing the aperture and increasing the time accordingly will NORMALLY
> produce a picture with the same brightness. You have to EITHER close the
> aperture OR decrease the time.
>
> Now, why didn't this happen with your second shot? First, the MZ-M like
> 99,9% of all cameras meter on automatic only up to 30 seconds, so you
> didn't get your 64 seconds.
I was using bulb mode during my second shot. Therefore the meter was not
active.
> Second and more important, when a film
> receives very little light, then the trick with doubling the time does not
> really work. You have to tripple or even quadrupple the time for one
> f-stop difference.
I didn't know this part of "film story".
> Anyhow, try your shot again, with the same lighting. Set the camera to
> manual operation, and take several shots: f/5,6 and 4 seconds and f/8 and 4
> seconds. This should give you two pics with -1 and -2 stop exposure. In
> other words, 1 stop and 2 stop darker than your initial photo.
>
> NOW; BIG WARNING. Even if this yields correct exposure on the negatives,
> the lab that makes the prints will automatically apply +1 and +2 stop
> correction in order to "correct" your underexposed pictures. You need to
> tell them NOT to do that automatic correction.
> Cheers,
> Boz
Thank you very much. I will do the experiments that you have described and
as Rob has suggested to note down the the exposure values, I will do that
also so that I can compare with results of my previous experiments.
With best regards,
Ayash Kanto.
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