Thanks Peter, I just downloaded it. Don
> -----Original Message----- > From: P. J. Alling [mailto:[EMAIL PROTECTED] > Sent: Tuesday, May 24, 2005 11:45 AM > To: [email protected] > Subject: Re: F stop question > > > There's a neat little utility called Fcalc from a company called > Tangentsoft > http://www.tangentsoft.net/ > The version that runs under windows is free. > It's worth downloading for help file, which contains the all the > formulas used, alone. > It includes an Fstop calculator > > The multiplier isn't particularly simple if you want accuracy. > > Don Sanderson wrote: > > >How does one figure partial stop numbers? > >For instance what stop is half way between 4 and 5.6? > >And where does 4.76 fall? This is a 2.8 lens with the > >SMCP-F 1.7x converter. > >I'm guessing there is a simple multiplier for this but > >with my limited knowledge of math I have no clue > >what it is. > >This is more out of curiosity than necessity. > >Someone posted a link to this info but I can't find > >it again. > > > >TIA > >Don > > > > > > > > > > > -- > A man's only as old as the woman he feels. > --Groucho Marx >
