I don't know what lens you're using but, assuming a 50mm lens and a
thickness error on the adapter of 0.1mm the lens will be precluded from
focusing beyond 25 meters. But, at f/5.6, and assuming a CoC of 0.017mm
(suitable for 4/3) you should have DOF out to 365 meters. At f/2,
however, your far focus will be limited to about 37 meters or about 120
feet. Your pixel peeping view may be more stringent than my assumptions.
Chuck Norcutt
On 8/21/2011 7:03 PM, Jim Nichols wrote:
> Chuck,
>
> I think you may be correct. From a crude inspection of jpgs at 100%, lens
> set at the infinity mark, it appears to go OOF beyond 100 -150 feet.
> Close-ups, of course, are fine. I may take a look at applying some wet or
> dry paper to the flange, to try to get closer to spec.
>
> Jim Nichols
> Tullahoma, TN USA
> ----- Original Message -----
> From: "Jim Nichols"<jhnichols@xxxxxxxxxxxxx>
> To: "Olympus Camera Discussion"<olympus@xxxxxxxxxxxxxxxxx>
> Sent: Sunday, August 21, 2011 4:32 PM
> Subject: Re: [OM] mount mod: nikon/canon to OM
>
>
>> Hi Chuck,
>>
>> Thanks for the data. Since I squeezed Superglue into the adapter, I may
>> have altered the spacing a little. At different points around the
>> adapter,
>> I measured from 7.0 to 7.2mm.
>>
>> I seldom work at infinity, and when I do, DOF may bail me out. I will
>> check
>> next time I use the adapter. I can't say for sure about the Pentax
>> lenses,
>> but several SLR lenses will focus past infinity. For sure, my Leica
>> Summicron 50 will do that.
>>
>> Jim Nichols
>> Tullahoma, TN USA
>> ----- Original Message -----
>> From: "Chuck Norcutt"<chucknorcutt@xxxxxxxxxxxxxxxx>
>> To: "Olympus Camera Discussion"<olympus@xxxxxxxxxxxxxxxxx>
>> Sent: Sunday, August 21, 2011 2:39 PM
>> Subject: Re: [OM] mount mod: nikon/canon to OM
>>
>>
>>>
>>> Register distances in mm - M42, 4/3, Micro 4/3
>>>
>>> |------------M42-45.46------------------------>|
>>> |
>>> |------------4/3-38.58----------------->|<6.88>|
>>> |
>>> |------Micro-4/3-20->|<-----------25.46------->|
>>>
>>>
>>> According to the specs I have, both of you should be having some
>>> difficulty getting to infinity. There seems to be some confusion
>>> whether the M42 register distance is 45.46mm or 45.50mm but, in any
>>> case, the difference between the 4/3 and M42 doesn't quite reach 7mm and
>>> certainly not 8mm.
>>>
>>> Chuck Norcutt
>>>
>>>
>>> On 8/21/2011 3:07 PM, Chris Trask wrote:
>>>>>
>>>>> As added information, the flange-to-flange thickness of the Fotodiox
>>>> adapter
>>>>> is 7mm, excluding the bayonet length.
>>>>>
>>>>
>>>> Mine is 8.0mm. Judging from the picture in the eBay listing, I
>>>> would
>>>> say that the one I just bought from India is in the order of 1.5mm, same
>>>> as
>>>> the depth of the locking recess on this one. We shall soon (3-4 weeks)
>>>> know.
>>>>
>>>> Chris
>>>>
>>> --
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>>>
>>
>>
>> --
>> _________________________________________________________________
>> Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
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>>
>>
>
>
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