Archived posting to the Leica Users Group, 1998/07/02

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Subject: Re: [Leica] M6 Rangefinder aligment.
From: Francesco Sanfilippo <fls@5senses.com>
Date: Thu, 02 Jul 1998 13:55:04 -0700

Where are these ports??

Francesco


At 01:55 PM 7/2/98 -0600, you wrote:
>>Could someone please explain?
>>
>>My M6 rangfinder is "off" vertically (left to right/right to left) at
>>infinity. I haven't noticed a problem with photos and yesterday ran a very
>>quick and very dirty "test" by starting at 28" with my 50 summicron, and
>>then backing away from a fixed object and taking a photo at each distance
>>mark on the lens, including infinity. All were "sharp." So what gives?
>>
>>Thanks
>
>Well. if it works, don't fix it.
>However, I don't understand your description of how it's off.  "vertically
>(left to right/right to left)" sounds like an oxymoron to me.  To me,
>vertical misalignment means the images are out of register up and down,
>while horizontal misalignment means that the focus obtained by the
>rangefinder is different than the best focus at the film plane.
>	It sounds like you are describing horizontal misalignment.  One
>good way to adjust a rangefinder horizontally is to put the lens at
>infinity focus.  (Checking to be sure the lens is really at infinity focus
>is another matter altogether.)  Put the camera on a tripod and aim the
>middle of the rangefinder patch at some very contrasty subject very far
>away, preferably well over a mile.  Find the correct port for adjusting the
>horizontal rangefinder alignment, and turn it with a screwdriver until the
>images are perfectly superimposed.  Some subjects are better than others
>for doing this.  A star is pretty good.  A bright small object at the
>horizon is good, too.   Vertical misalignment can be adjusted using the
>same subject.
>Mark Walberg
>