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FE 85mm OOF/Bokeh
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Stueyman View Drop Down
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Posts: 242 		Post Options Post Options   Quote Stueyman Quote  Post ReplyReply Direct Link To This Post Topic: FE 85mm OOF/Bokeh
    Posted: 07 March 2018 at 00:38
Hi All, it's been a long time since I posted, but I wanted to check if anyone else had any comments/issues regarding the OOF/Bokeh qualities of the Sony FE 85mm lens. I got this shot the other day, and the OOF areas aren't quite what I would expect wide open. Anyone else seeing the same or is it just my copy?

Cooling Down by Stuart Watson, on Flickr
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sybersitizen View Drop Down
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Posts: 14357 		Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2018 at 00:57
I don't have that lens; but I can tell you that bokeh characteristics will be consistent among all examples of a particular lens ... unless there's something very weird going on.

In this case I think there was something very weird going on. I see it was shot at 1/8000s, and I'll bet you used EFCS. That's a combination that is known to ruin bokeh.
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Stueyman View Drop Down
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Posts: 242 		Post Options Post Options   Quote Stueyman Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2018 at 01:11
**feels like a n00b**

Magic, it was indeed on, will check again when the sun comes back out.
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kapuschinsky View Drop Down
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Posts: 157 		Post Options Post Options   Quote kapuschinsky Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2018 at 03:27
Originally posted by sybersitizen sybersitizen wrote:

I don't have that lens; but I can tell you that bokeh characteristics will be consistent among all examples of a particular lens ... unless there's something very weird going on.

In this case I think there was something very weird going on. I see it was shot at 1/8000s, and I'll bet you used EFCS. That's a combination that is known to ruin bokeh.


Interesting! How does EFCS compare to the VR mechanism in the A mount bodies, such as an a900?
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sybersitizen View Drop Down
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Posts: 14357 		Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2018 at 03:40
Originally posted by kapuschinsky kapuschinsky wrote:

Interesting! How does EFCS compare to the VR mechanism in the A mount bodies, such as an a900?

What's VR - vibration reduction? EFCS (electronic front curtain shutter) has nothing to do with image stabilization systems; they're independent processes.
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Stueyman View Drop Down
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Posts: 242 		Post Options Post Options   Quote Stueyman Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2018 at 03:46
afaik the EFCS option can be enabled to reduce "shutter shock" when shooting at certain focal lengths / exposure times. It essentially reads the sensor to start the exposure and the mechanical shutter ends it. When it's turned off the mechanical shutter opens to start and shuts to finish.
It's also academic when shooting at 1/2000 or over due to sensor read times, which is part of what sybersitizen mentioned in his original reply. I just didn't realise it was always on!
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sybersitizen View Drop Down
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Posts: 14357 		Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2018 at 05:07
The potential bokeh-killing effect of EFCS at high shutter speeds was demonstrated in this DPR thread from almost a year ago. There was initial resistance from a couple of skeptics there as to what was happening ... but they finally came around. It might be interesting reading for the uninitiated.
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Stueyman View Drop Down
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Posts: 242 		Post Options Post Options   Quote Stueyman Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2018 at 05:25
Nice, I tend to avoid DPR forums for the trolls, but good work!
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Miranda F View Drop Down
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Posts: 3573 		Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 07 March 2018 at 10:10
Yes, a very interesting read, together with the links there. Thanks, Syber.
Miranda F & Sensorex, Sony A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
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