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Fujifilm X-10 and Fujinon XF 90mm f/2 R LM WR announced
#7
Quote: 

The Canon being an L lens (better build, probably weather sealed) would not make it a heavyweight... Nor would UD elements.
You can't just drop low dispersion glasses into a design without changing anything else, everything else will change radically if you do that.  The lens would be completely different if it used extra low dispersion materials.

 

Quote: 

Of course, it may be that the Fuji just is a "modern" design approach, where the quest for easy sharpness makes for heavy big lenses (think Sigma 50mm f1.4 Art, Otus nr 1 and 2 for instance).
Stated frankly, today's level of performance in yesteryear's size envelope is impossible without extremely high prices.  Compact+high performance is very hard to pull off.  There is an accelerated development cycle for mirrorless, but I do not believe that in general it is the cause of big lenses. 

 

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And that Leica is 135 format coverable.

 

The Canon EF 85mm f1.8 USM is actually not much smaller than the Fuji, though. It measures 75mm x 71.5mm, and the Fuji flange distance being 17.7mm and the EOS one 44mm, the length difference is just 78.7 - 71.5 = 7.2mm. Small difference. But yeah, the Fuji is only APS-C (at least, I can't speculate on Fuji starting an FF X-body and is designing lenses with FF coverage already), and that makes it a pretty heavy lens.
"covering" a bigger format with long lens designs requires a larger rear element size but does not cause an especially large change in the size of the front of the lens. 

  


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Fujifilm X-10 and Fujinon XF 90mm f/2 R LM WR announced - by Scythels - 05-18-2015, 04:28 PM
Fujifilm X-10 and Fujinon XF 90mm f/2 R LM WR announced - by Scythels - 05-20-2015, 11:13 PM

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