[MF3D.FORUM:372] Re: 1/fl

[Paul Talbot <ptww@xxxxxxxxx>]

Bill Glickman wrote:
> 
>        Are you saying if we use your formula, that we should vary the
> deviation based on the fl lens used?  On my test shots using your formula, I
> was planning to use 2.7 for all fl lenses... is this correct?  If not, what
> is the relationship between deviation and the different fl lenses I plan to
> use?

If I understand correctly, John seems to be saying that if
the slides will only be hand-viewed, a constant OFD is
advisable.  So if you don't plan to project your MF stereo,
go ahead and use a constant figure for OFD.  (But I have
other questions about John's post also.)

BTW, how is the 2.7 calculated?  What is the basis of the
fraction that should be used to go from 1.2 to 2.7?  I
realize it's to give effect to scaling up from 35mm to
MF.  A viewing distance ratio would give (80/44) * 1.2
or 2.18, so I know that ain't it!

Paul Talbot