[photo-3d] Re: DOF & Rangefinder

["Chuck Holzner" <cfholzner@xxxxxxxx>]

--- In photo-3d@xxxxxxxxxxx, "Don Lopp" <dlopp@xxxx> wrote:
> Chuck,Chuck Holzner-I hasve never seen a slide film capable of 
resolving 60
> lines per mm DON

Don----
Fuji, in their data sheets lists resolving power

Provia 100 RDP II as:

@ Contrast ratio    Lines/ MM

1.6/1                 60
1000/1               140

Velvia:

1.6/1                 80
1000/1               160

I don't have a chart for Provia 100F-RDP III but it is suposed to be 
better then the RDP II.   True, you are not likely going to take 
pictures with 1000/1 contrast often but 1.6/1 is everyday.

I can't project this kind of resolution, there just aren't enough 
dots on my screen to do it, I am not saying that no one can.  I get 
best resolution with a good viewer, and have got in the range of 60 
lpmm using Velvia and Provia 100F films.  

Since the DOF scale on 35 mm stereo cameras and Realist hyperfocal 
charts set their limits about 30 lpmm, you have to set tighter limits 
to get the 60 lpmm in the DOF. To do this, it is helpful to know the 
distance to the objects you are photographing and a good rangefinder 
comes in handy. You can then set focus for optimum DOF for the view.

Do all my shots do 60 lpmm?  No way, it is just the best I have been 
able to do so far.

Chuck