Teemu writes:
> I read somewhere that wide angle lenses with a floating element system
> perform nicely when focused close, whereas lenses that do not
> incorporate this system produce poor results.
>
> I would use the 28 mm zuiko lens with extension tubes to produces images
> with magnification ratio greater than 1:10. What I'm looking for is good
> results with the lens fully stopped-down, light-gathering power is not
> so much of a concern. The 28/2.0 lens with its close correction
> mechanism, is it worth it? Or would the cheaper 28/2.8 lens do the job?
Hi Teemu:
Using extension tubes with a floating element lens is difficult. You
generally have to use the lens' helical focusing, which then changes the
floating element spacing from the optimum setting for closest focusing.
At f/16, a floating element design's performance will be lost to diffraction
effects. I'd go with the 28 mm f/2.8, but must admit that I have no published
data or practical experience to back this up. (I just thought I'd offer some
input since no one did).
Gary Reese
Las Vegas, NV
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