Re: Sputnik depth of field

[John Bercovitz <bercov@xxxxxxxxxxx>]

> Does anyone have a chart, numbers, or a formula
> for depth-of-field ranges for the Sputnik?

I have them for 3D in general, but not specifically
for the Spud.  Go to

http://www.angelfire.com/ca2/tech3d/images/DOF.xls

And then the last two entries are an explanation,
which is 

http://www.angelfire.com/ca2/tech3d/images/kdof.gif

and a spreadsheet, which is

http://www.angelfire.com/ca2/tech3d/images/DOF.xls

The spreadsheet has a pretty good selection of 
apertures already there but you'll want to change
the focal length of the lens to 75 and the distance
from the entrance pupil to the in-focus object to
something a little more reasonable than 200 mm.  8-)
You can leave the acceptable C of C at 1 in 2000 
or change it to 1 in 1500 or even 1000.  This is a
judgement call which is why different DOF calculators
give different results.

John

PS: The Spud is a front-cell focusser but that
won't materially affect the results except in the
macro range which is a range I don't expect you to
be in with a Spud.  8-)