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Re: [OM] Was: mount mod; Now M42-to-4/3 Adapter Thickness

Subject: Re: [OM] Was: mount mod; Now M42-to-4/3 Adapter Thickness
From: "Jim Nichols" <jhnichols@xxxxxxxxxxxxx>
Date: Mon, 22 Aug 2011 16:52:23 -0500
I just thinned my M42 down to 6.9mm, to agree with Chuck's specs.  I will 
give it another try when I have time.

Jim Nichols
Tullahoma, TN USA
----- Original Message ----- 
From: "Chris Trask" <christrask@xxxxxxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Monday, August 22, 2011 4:01 PM
Subject: Re: [OM] Was: mount mod; Now M42-to-4/3 Adapter Thickness


> >
>> I think my statement caused some confusion.  It was poorly crafted, to 
>> say
>> the least.
>>
>> The lens that I referred to is a Leica-R Summicron 50/2, and must use a
>> Leica-R to 4/3 adapter, so it won't work with the M42 adapter.  What I
> found
>> with this lens is that the most distant object I can find comes into 
>> focus
>> before the focusing index reaches the infinity mark.  I have to back off
>> from the infinity stop to get it in focus.  This is the lens I used to 
>> see
>> what an "infinity" image would resolve with my camera.
>>
>> I compared the previous image, made with a Pentax Takumar 55/1.8 lens and
> my
>> M42 adapter, to the Summicron image, and, at a distance, I find little
>> difference.  As Chuck pointed out, it appears that the earlier image was
>> made at a smaller aperture, because the foreground was sharper.
>>
>
>    Okay, now I better understand.  To rephrase what I stated earlier, I'll
> have to keep in mind to open up the aperture fully so as to reduce the 
> depth
> of field when doing the focusing test later.  That adapter is on a slow 
> boat
> from Calcutta, so it's going to take a couple of weeks before it arrives.
>
> Chris
>
> -- 
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