[rollei_list] Re: a little unparallel of lens panel

This Automat has something wrong with the focusing rack gear.  All close
work OK til it comes to ~50 foot, and then it tilts to one side -- you
can see it.  It does not affect anything except vanishing points, being
far less "shift" than my Linhof is capable of...  Still, I know it is
there.

I just thought the man whose machine was "never in focus" might have a
shifted element...

P.J. Nebergall



On Mon, 24 Jul 2006 10:47:37 -0700 "Richard Knoppow"
<dickburk@xxxxxxxxxxxxx> writes:
> 
> ----- Original Message ----- 
> From: "Peter J Nebergall" <iusar4s@xxxxxxxx>
> To: <rollei_list@xxxxxxxxxxxxx>
> Sent: Monday, July 24, 2006 6:59 AM
> Subject: [rollei_list] Re: a little unparallel of lens panel
> 
> 
> >I have an Automat that is mildly out at infinity.  That 
> >"not focus at any
> > distance," I suspect is a shifted lens element."
> > P.J. Nebergall
> >
>    Do you mean that nothing in any picture is in focus or 
> that the finder and taking lenses are never in focus at the 
> same time? If the first, there is something wrong with the 
> taking lens. If the second, the taking and finder lenses are 
> out of coincidence. The first could happen but is unlikely, 
> if this is the problem check to see that both lens cells are 
> screwed in all the way. The second problem requires 
> adjusting the finder lens focus. The difficulty is that the 
> covering of the lens board must be removed. Coincidence can 
> be set at any distance. Once set the two lenses should track 
> at all distances. Infinity focus is set for both lenses by 
> the infinity stop, which is part of the focus knob. The knob 
> fastens to the focus axel by means of a sort of collet. This 
> setting can be done on most Rolleis by taking the cover off 
> the focus knob and on cameras with built in lightmeters by 
> taking the lightmeter indicator off the knob.
>    It could also be caused by the focus screen not being 
> seated correctly. In the Automat, and other models with 
> non-removable focus screens the screen is referenced to the 
> inside surface of the focus hood and is held against it a 
> couple of flat springs. It is possible for the screen to 
> become cocked slightly. Sometimes just pushing in on the 
> screen with a finger (or eraser end of a pencil) and 
> jiggling it a little will get it seated right.
>    I think the only element in either lens that can be 
> gotten back incorrectly is the middle element of the viewing 
> lens. It can be installed reversed. The finder image is then 
> awful. The middle element is biconcave with almost, but not 
> quite, equal curvature on either side so its hard to tell 
> visually which side is which.
> 
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx 
> 
> ---
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