[MF3D.FORUM:1210] Re: Sputnik focus fix

["Don Lopp" <dlopp@xxxxxxxxxxxxxxx>]

----- Original Message ----- 
From: "Paul Talbot" <ptww@xxxxxxxxx>
To: "Medium Format 3D Photography" <MF3D.Forum@xxxxxxxxxxxxx>
Sent: Tuesday, August 22, 2000 5:24 PM
Subject: [MF3D.FORUM:1134] Re: Sputnik focus fix


> 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
>