That's cool. Looks like maybe you built it from the eSIF?
Chuck Norcutt
Moose wrote:
> Dawid Loubser wrote:
>> That makes sense. I've never used a 40/2.0 (would love one) but symmetrical
>> designs generally produce great background blur, and the 40/2.0 is one of
>> the few (if any?) OM Zuiko fully symmetrical lens designs?
>
> The 40/2 is no more symmetrical than the various 50 mm lenses.
> <http://www.moosemystic.net/Gallery/tech/Lenses/SECT-HORIZ.jpg>
>
> The 40 mm and all the 50s, and indeed essentially all 40-58 mm pancake &
> normal FL lenses for 35 mm SLRs & FF DSLRs, are variations of the
> double-gauss design. Those faster than f2.8, depending partly on price,
> usually have an additional element. Thus the 7 element 50/1.4 & 1.2 Zuikos.
>
> The economy 50/1.8 is 6 element and the 50/3.5 macro is slow enough to
> get by very well with a single element rear corrector lens. The 40/2 was
> an inexpensive lens when introduced. The 6 element design is probably
> partly to reduce cost and partly to reduce size. It's also the reason
> for it's slightly less than first rate performance, I'd guess.
>
> Pancake designs by various makers are generally around 40 mm for the
> simple reason that that is as short as a non-retrofocus, double-gauss
> design can be made within register distance and mirror clearance
> constraints.
>
> Moose
>
>> Though the dedicated Macros (80 and 135) are also pretty symmetrical if I
>> recall correctly, hence their good performance in the bokeh department.
>>
>
> Yup, both double-gauss.
>
>> I wish we could put together one nice database (suggested last year
>> sometime) of sample images made through all zuiko lenses.
>>
>
> This is far more ambitious a project than you might imagine. The problem
> is that bokeh is significantly affected by both focal plane and
> background distances and perhaps by the ratio of them..So the number of
> test shots required is considerable for each lens.
>
> Moose
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