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Re: [OM] Which soft, How Soft? [was soft addiction]

Subject: Re: [OM] Which soft, How Soft? [was soft addiction]
From: Wayne Shumaker <om3ti@xxxxxxxx>
Date: Thu, 08 Dec 2022 08:15:46 -0700
At 12/7/2022 10:02 PM, Balderdash wrote:
>On 12/6/2022 8:01 AM, Wayne Shumaker wrote:
>>I came across a discussion on FM about how EFCS can affect bokeh at high 
>>shutter speeds, which often can happen when using fast lenses wide open.
>>"You are 100% right that the bokeh is busy in this shot. The reason is not 
>>the lens though. Those half-circles mean you're shooting using EFCS, which 
>>when combined with high shutter speed (due to f1.2) ultimately degrades 
>>background blur smoothness."
>Methinks this be balderdash. Made no sense to my brain. Didn't compute with my 
>fairly extensive experience with bokeh. Then I searched "cat's eye bokeh" and 
>got several hits, including a different FM thread and known competent sites. 
>All attribute it to optical effects of physical lens design.
>Squinting Moose

Looking at the original posted photo, it is a real EFCS effect. I have it on my 
list to test, and may be A7Rx EFCS related. Not all electronic shutters are the 

The original post was not about cat's eye, rather "half-circles" in the shot on 
the previous page. The background OOF has, what normally would be a blurred 
circle, a cut in half circle. This is highly likely due to EFCS since the cut 
is horizontal like the shutter travel. The lens was a sony 50mm 1.2 GM, which 
normally has very smooth bokeh, not cat's eye, and was shot at 1.2 with a fast 
shutter speed. 

Cat's eye is definitely the optics, but not these horizontally cut in half 
circles. No optics can do that.

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