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A bokeh comparison test I did with the 135mm f2.8 STF and the Leica 90mm APO
Old 03-17-2014   #1
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A bokeh comparison test I did with the 135mm f2.8 STF and the Leica 90mm APO

I recently acquired a 135mm f2.8 Smooth Transitional Focus lens and wanted to see how good the acclaimed "bokeh machine" really is. The STF is mounted on an A7 with the LA-EA3 adapter. To adjust for FOV I shot the 90APO on a NEX-7 and used f2 instead of f2.8. Pictures were adjusted in photoshop for netural WB and the removal of compression artifacts.

I tested for both foreground and background bokeh, and can confirm that contrary to what I've read elsewhere, there is essentially no difference between them for the STF.

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Noctilux ASPH, 35lux FLE, 50 APO ASPH, 75 APO cron, 21lux, Sony/Minolta 135mm STF

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Old 03-17-2014   #2
YYV_146
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The change in the field of view is purely because of breathing. I am actually a bit surprised at how much the STF's image changes with the focal point...The APO cron's FOV is however consistent through 1m - infinity.
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