It was thoroughly and not conclusively discussed some 10 years ago.
I think it's worth a new thread on this prime.
Also, I seem to remember Carlos Santisteban thought there was no
significant differences and possible complications regarding cementing
more elements in newer designs.
Fernando.
On Fri, Aug 29, 2014 at 9:28 PM, Chuck Norcutt
<chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
> I didn't know that but you can see it here
> <http://olympus.dementix.org/eSIF/om-sif/lensgroup/85mmf2.htm> in the
> "optical construction" part of the specs. One design is listed as 6
> elements, 4 groups. Another (in parenthesis and presumably the older
> design) is listed as 5 elements, 4 groups. Mine is a silver nose and
> presumably 5 elements.
>
> Chuck Norcutt
>
>
>
> On 8/29/2014 7:11 PM, Ken Norton wrote:
>>
>> At least three. There was also a very significant change in the design
>> that
>> resulted in a different number of elements.
>>
>>
>> On Friday, August 29, 2014, Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
>> wrote:
>>
>>> How many versions are there? More than three... single coated,
>>> multi-coated (labeled), multi-coated (unlabled)???
>>>
>>> Chuck Norcutt
>>>
>>>
>>> On 8/29/2014 2:54 PM, Ken Norton wrote:
>>>
>>>> OK, so we have one more vote from the peanut gallery in favor of the
>>>> 85/2. I won't ask, yet, which version.
--
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