Re: re: calculating exposure

I didn't see it there. Where on the page is it?

How does one calculate half stops? I tried adding 1/22 and 1/32, then
dividing by 2, but i got f/26.07, not 1/27.25 like you got. I would like to
make a dial calculator with half stops because most of my cameras have
apertures that are not full stops. I've finally given in to using a
spotmeter after many failed pictures :P I was chewed out last year for
criticizing people about being so concerned with the exposure. I guess I
deserved it.

John

John----- Original Message -----
From: "Andrew Sias" <andrewsias@excite.com>
To: <pinhole-discussion@pinhole.com>
Sent: Thursday, December 28, 2000 5:04 PM
Subject: Re: [pinhole-discussion] re: calculating exposure

>
> > It's easy to make a dial calculator like the one on an exposure meter,
> but
> > that goes to longer exposures and slower film speeds. I've got one on
> > my web page at http://linux.bbn.com/~koolish
>
> Thanks for the dial calculator. I downloaded it and am going to make one.
> I have been using something similar but it is a bit more cumbersome. I
made
> a long slide-rule with all of the f-stops and speeds projected beyond my
> handheld light meter. The only information my slide rule has that the
dial
> doesn't have is that I have included f-stops and shutter speeds halfway
> between each of the standard settings. For example: the extra f-stop
> between f/22 and f/32 would be f/27.25. I have done this all the way up
to
> f/4096 and 16,384 seconds (or 4.5 hours). Most people don't need to go
that
> high but you never know.
> Andrew
>
>
>
>
>
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Received on Fri Dec 29 19:15:11 2000