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Re: [OM] Doing the Splits

Subject: Re: [OM] Doing the Splits
From: John Hermanson <omtech1@xxxxxxxxxxx>
Date: Thu, 19 Aug 2010 08:38:45 -0400
I typically have to adjust mirror angle.  Minor impact will throw that 
out. Finder focus (mount to focus screen) is a dog to adjust and I have 
not done one since I left Olympus.

___________________________________
John Hermanson  |   CPS, Inc.
21 South Ln., Huntington NY 11743
631-424-2121  |  www.zuiko.com
Olympus OM Service since 1977
Gallery: www.zuiko.com/album/index.html

On 8/18/2010 3:58 PM, usher99@xxxxxxx wrote:
> AG writes:
> "Of course, I must acknowledge the elephant in the room. Calibration
> accuracy of the focus system in the OM-3Ti is probably not that good
> and you also run into the issue of film flatness. But those are issues
> outside of the discussion regardling human abilities."
>
> Thanks for that whole excercise.  I wonder how much of an issue the
> calibration actually is?  John has stated that thisi s factory
> callibrated and he only had to adjust things a very few times over the
> years.  Canyon doesn't advertise but tacitly admits slop in the system
> as they sell shims for the focusing screens for those that want it spot
> on as possible.  The stock screen really allows MF at about f4 and the
> Ee-s perhaps 2 stops more precision.
> I am guessing and have  seen others assert that the 1-13 allows
> accurate focusing assuming the system is alligned at about f1.4 and the
> 2-13 though brighter results in a stop or so loss of precision.  Hate
> that no free lunch principle of optics.
>
> A mostly in focus,
> Mike
>
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