What's this? A metal turning lathe in the basement?
Chuck Norcutt
On 8/22/2011 5:52 PM, Jim Nichols wrote:
> 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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>>
>
>
--
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