[MF3D.FORUM:1134] Re: Sputnik focus fix

[Paul Talbot <ptww@xxxxxxxxx>]

Don Lopp wrote:

> Sputnik focus first $35 seams a bit high to me,

Based on how long it took me to do a few of them the last
couple days, it would have been a superb bargain when
calulated as an hourly rate!  I was on the steep part of
the learning curve, and working on developing my techniques.

> in any event  it is best to determine focus at 
> infinity, not at any inter mediate distances because of
> depth of focus problems.

Most sources talk about setting focus based on infinity, but
I'm not sure I understand why, except that it seems to be far
less demanding.  Setting focus based on, say, 15 feet, requires
far more precision.  It seems to me that two lenses that appear
to be in synchronized focus at infinity could easily be off by
several feet when focus is changed to a closer distance.

So my tentative conclusion is synchronize focus at infinity
for a "quick and dirty" solution, but synchronize focus at
a much closer distance for pinpoint accuracy.  Am I going
wrong somewhere?

Paul Talbot