[MF3D.FORUM:998] Re: Mounting tips?

["David W. Kesner" <drdave@xxxxxxxxxx>]

Paul Talbot writes:

> However, shouldn't the
> new Fn marks that you propose have different spacing than the
> Fn marks for infinity?  When bringing something through the
> window, it's usually a small amount of the overall depth, not
> nearly a full 2+mm of OFD.

I may be really confused here so is the maximum on film 
deviation the distance between the farthest homologous points 
when the window is at zero or is it when the closest object is 
at zero?

If your closest object is at the window then you will have a 
"v" with the overlapping points at the apex of the "v" which 
is at the window. If your closest object comes through the 
window then you will have an "x" with the overlapping points 
at the cross-over which is at the window.

Let's say you have an image with 4.0mm deviation at infinity 
when mounted with the closest object at the window ("v"). If 
you bring the close object through the window ("x") to a point 
where infinity is now at 2.0mm deviation that means that the 
near point will also be at 2.0mm deviation (from the window). 
Is this still 4.0mm total on film deviation or is it 2.0mm?

Now everyone is really confused *{;-)

That's all for now,

David W. Kesner
Boise, Idaho, USA
drdave@xxxxxxxxxx