At 14:04 06/09/2003 -0300, Fernando Gonzalez Gentile wrote:
>on 9/06/2003 12:02, Matt BenDaniel at matt@xxxxxxxxxxxx wrote:
>
>> At 10:19 06/09/2003 -0300, Fernando Gonzalez Gentile wrote:
>>> ...I understand that a professional standard requires both handheld light
>>> metering and intuitive knowledge.
>>
>> Are there light meters than can accurately meter a scene or meter the sky in
>> extremely dark nighttime conditions?
>> Do such meters allow you to calculate aperture/duration when the duration may
>> be 8 hours long?
>> --
>I don't know, Matt. I was hoping you might know. I judge (from my lay man
>pint of view) a good exposure in this conditions when the color of the sky
>rendered on film is similar to the one I recall, and when I can distinguish
>on film the different colors and bright magnitude of the stars. I cannot
>distiguish the latter with the accuracy I'd wish using my naked eye. In fact
>I suffer from myopia since I was 9 and discovered when corrected, stars were
>pinpoint sharp and saw the bars which supposedly existed where birds were
>kept. I never watched through a telescope. How do you guess such exposures?
I had never used E100VS for star trails, so on my first night I guessed wrong.
I guessed f/8-1/2 for a six hour shot, but the shot came out too dark.
I got my shots developed immediately after the first night so I knew.
I switched to f/4 - f/5.6 for the remaining nights and they came out great.
I should mention that I didn't find E100VS to be the best film
The sky came out too green, which I was only mostly able to correct in
Photoshop.
Provia 100F and E200 are the best films I know for star trails.
Look on my web site here for example exposures to be your guide:
http://starmatt.com/gallery/astro/starTrails.html
Note that assessing the prevailing sky conditions is the part that requires the
most experience.
>OTOH I studied astronomy when I was15 and am still very fond of this.
>Unfortunately, Ars Longa Vita Brevis. There is a big gap between what I
>understand and what I see. Did you read Umberto Eco L'Isola del Giorno
>Prima?
Sorry nope.
--
Matt BenDaniel
matt@xxxxxxxxxxxx
http://starmatt.com
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