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Fred, that makes sense. I venture to guess that the main reason for Sony not to do it because of the dated AF motor/system of the lens itself. I had that lens for a few years. Optically, it is awesome, well, it has some LoCA issues but it can be fixed and for portraits, it doesn't matter much, if any. Sony has to tweak the optics a bit to reduce the LoCA issue, and more importantly put in a new AF motor/system and the new Sony FE 135mm f/1.8 GM is born and ready for prime time! As far as...Show more →
Until we see a 135GM, there are two great options for those who prefer 135mm with native auto-focus functionality: (EyeAF and all Lock-AF functions)
*Sigma 135/1.8 + MC-11: Should be a better choice for those who favor speed over weight while still retaining "native" AF functionality through the adapter. It seems to be well corrected for aberrations (Not as good as the Batis) and great resolution/contrast (Probably similar to the Batis at same apertures). Full AF functions including EyeAF but some reports of hunting at certain distances. With the adapter it's $1,650 ($350 less compared to Batis).
Weight: 1,300g (with MC-11 adapter) making it more than twice as heavy as the Batis. (615g)
*Batis 135/2.8 APO: The only choice for whose who prioritize weight over speed with native AF. It's a bit more than a stop slower but seems to be better corrected for aberrations with slighter higher resolution/contrast across the field. (both wide open). They should be very similar in terms of IQ at f/2.8 which is quite an amazing feat. The major compromise is the lower background blur due to the smaller aperture.