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Re: [OM] CZ Jena Tessar

Subject: Re: [OM] CZ Jena Tessar
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Tue, 07 Dec 2010 07:11:02 -0500
What Moose said.

Chuck Norcutt

On 12/7/2010 6:42 AM, Moose wrote:
> On 12/7/2010 3:20 AM, Alan Wood wrote:
>> Is there a safe way to check that the 5D mirror does not hit the rear of the 
>> lens?
>>
>> I am hoping that there is a better way than mounting the lens, firing the 
>> shutter, and hoping for the best.
>
> There are at least three of ways I can think of.
>
> 1. Assuming the mirror is driven mechanically in one direction and by springs 
> the other, mount the adapter sans lens,
> gently manipulate the mirror up or down and see if it hits something soft 
> stuck to the top of the adapter opening to the
> depth of the lens when mounted.
>
> 2. Tape a small steel ruler across the mount opening, above the middle, about 
> where the top of the lens protrusion will
> be. Move the mirror up and down and measure the smallest clearance. compare 
> to the distance the lens protrudes. behind
> the adapter mount flange.
>
> 2. Less elegantly, just screw the lens in only to the depth of the adapter, 
> then screw it in a quarter turn at a time
> and fire the shutter. the tiniest little click, heard and/or felt, would mean 
> stop. If that doesn't happen, all is well.
>
> Measurin' Fool Moose
>
>
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