Greetings,
I
>have'nt used a light meter for almost ten years (I don't even know if
>mine works !) and rarely over/under expose a shot, regardless of the
>conditions - and I use K25, which is'nt very forgiving in that area !!
>
>Robert Palmer
>
In actuality K25 is more forgiving than a faster speed film. Slower
speed
films obsorb light at a slower rate obviously, that is why they are
rated
such. So if you over expose a shot on K25 for one extra F stop, it will
have one fourth the impact of overexposing an ASA 100 film by one extra
F
stop.
This law of physics is why using slower speed film for night shots can
be
much more desirable than faster speed films. The slower thwe speed of
the
film, the less ambiant light will effect the shot. Thus allowing the
photographer more control over the end results.
That's what I like about this site, one side question can lead to
me/us down another path. Charlie's comment about how slower film works
with ambiant answered one of those oddities that I'd seen on my slides
but had written off as just either an oddity of local lighting or luck
of the draw. Another advantage to slower film is that it evidently
gives me a wider exposure window to work with on my night shots.
100,200 and 64 speed film in daylight makes a bracketing a fractional
second guessing game, while the low light situtations allowed me a more
forgiving exposure bracket. I'll confess to trying 400 speed print
film the first time I shot trains at night and was really disappointed
in the results. My slide shots did much better and now I know why.
Thanks.
Greg
Charles L. Dischinger wrote:
> I
> >have'nt used a light meter for almost ten years (I don't even know if
>
> >mine works !) and rarely over/under expose a shot, regardless of the
> >conditions - and I use K25, which is'nt very forgiving in that area
> !!
> >
> >Robert Palmer
> >
> In actuality K25 is more forgiving than a faster speed film. Slower
> speed
> films obsorb light at a slower rate obviously, that is why they are
> rated
> such. So if you over expose a shot on K25 for one extra F stop, it
> will
> have one fourth the impact of overexposing an ASA 100 film by one
> extra F
> stop.
>
> This law of physics is why using slower speed film for night shots can
> be
> much more desirable than faster speed films. The slower thwe speed of
> the
> film, the less ambiant light will effect the shot. Thus allowing the
> photographer more control over the end results.
>
> Charlie
> Charlie Dischinger
>
> -> SPORRS: 'Serious Photographers Of Railroad Related Subjects'
> -> Web Site: http://www.anet-stl.com/acphotog/sporrs/
> -> Message © 1998 SPORRS® - All Rights Reserved
-> SPORRS: 'Serious Photographers Of Railroad Related Subjects'
-> Web Site: http://www.anet-stl.com/acphotog/sporrs/
-> Message © 1998 SPORRS® - All Rights Reserved
