Review: Sony 135 f/2.8 STF on Sony A99 II

A couple of years ago I uses two lenses for a trip in Napa Valley: along the Zeiss 16-35 f/2.8 to be used for my normal landscape work, I also packed a copy of the Sony 135 f/2.8 STF, pushed more by curiosity than actual need. This is a unique and daunting lens at first sight, it's big, built like a tank and it doesn't autofocus: the apodisation element, that renders the silky-smooth bokeh it is so well known for, prevents the phase-detection sensors from doing their work, forcing to go all manual. Having myself never engaged in the dark arts of using manual focusing lenses and often relied on the magic of the AF module for a lot of my work, I was preparing to stare at countless out of focus shots mercilessly heading to the electronic bin.

How wrong I was.

Wine barrels in Napa Valley

The bokeh is obviously delicious, smooth, silky, insert your drooling word here, but coupled with the A99 II EVF and focus peaking the lens is also a joy to use: the apodisation element doesn't prevent the A99 II from recognizing and highlighting edges that are in focus, since the algorithm runs in image space, based on the data captured by the main sensor.

Focusing is a matter of rotating the very smooth focus ring until the portion of the frame you want to focus on is highlighted and snap away, knowing the result will be very, very, sharp where it is intended to. The color rendition is also superb: the image above has been barely touched in post (click for a larger view) just to remove small imperfections: a fantastic concerted effort by the camera/lens combo.

Back to focusing, the keeper rate was extremely high through the entire weekend both with static (easy) and moving objects.

From a mustard field, here's an image I was very happy to include in my stock portfolio: yes, it's just a flower, but that bokeh...

Mustard flower in Napa


I can't wait to use the Sony 135 STF again and try it out on more intimate landscapes.

The STF has also a dedicated aperture ring that controls a secondary aperture with ten blades that can be set between T/4.5 and T/6.7: it can be used to tweak the amount of light transmitted and the depth of field. When the dedicated aperture ring is set to A, the primary aperture is controlled by the camera. The system is pretty confusing, but once wrapped your head around it, it allows for some very fine control. I simply left it at T/4.5 and rolled with it. This lens is meant to be used wide open anyway.

The APD element does not only create unmatched bokeh, but it also decreases light transmission by about 1.5 stops, that might rather soon force to increase ISO when not shooting in bright conditions: that is why the 135 STF is marked as T/4.5 which means that the light transmitted when, for example, the lens is at maximum aperture is the same as the light transmitted by an equivalent lens stepped down to f/4.5. In other words: this is not a bright lens.
On the other hand, the A99 II doesn't suffer much from pumping up ISO, which reinforces the idea that the Sony 135 STF and the A99 are a match made in heaven by the Gods of Photography for us mere mortals: get one, go out and shoot.

Thumbs up:
  - Fantastic bokeh
   - Very, very, very sharp
   - Built like a tank

Thumbs down:
  - Manual focus only (is it really a problem now?)
  - Hefty price tag for a very specialized lens
  - Not a fast lens

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