On 8/16/2014 2:07 PM, Mike Gordon via olympus wrote:
Shuttered Moose writes:
<<I wonder if the DR effect in shadows is a result of quick flushing not being
quite complete.
Hmm,
This EFC stuff is almost as inscrutable as the DOF discussions usually
occurring in the depths of winter.
As I recall Sony has somehow allowed for flash on Nex and I am sure on the A7--all designed to have EFC and not a
firmware update.
I see reports of uneven exposure if pushing the sync speed with A7 using EFC. No Flash with EFC on Panny (and unlikely
on E-M1 either)--except with GM-1.
Yup, the GM1 has that advantage over GX7, flash with EFC. But it only has EFC or full electronic. Fortunately, it's on
the camera with which I'm most likely to want flash, although VERY seldom.
Artifacts (some are very cool) seen with EFC include banding in florescent light, banding if shooting panos moving the
cam or with moving objects, funky bokeh with high speeds/large apertures---gets squished.
The GM-1 is an engineering tour de force and has an obligate EFC. Above 1/500 sec the shutter is 100% electronic and
one loses a stop or so of DR----as best one can tell it is related to file only being
10 bit instead of 12---the sensor readout however is faster---1/25 sec or so instead of 1/15. I very much wonder how
the bokeh with specular highlights would look at high SS and largish aperture with long tele on GM-1 vs GX-7 with
latter using EFC. The faster readout should decrease the weird bokeh on the GM-1.
Panny enabled flash with EFC on GM-1 but sync speed is 1/50. On could only imagine the shutter shock on the tiny
GM-1 w/o EFC.
One feature of the GM1 is a completely different shutter mechanism, using a stepper motor, and much smaller and lighter.
So even if it implemented mechanical first curtain, it shouldn't have shutter shock. That's also why the 1/50 flash
sync, the stepper shutter is slowish.
Not sure how Fuji was able to almost completely avoid the shutter shock.
What I've read says all the µ4/3 cameras until the GM1 used the same shutter mechanism. Fuji probably uses a different
design.
http://www.imaging-resource.com/PRODS/panasonic-gm1/panasonic-gm1TECH.HTM
Ah well, all I said above, with much more detail. :-)
Soft Landing Moose
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What if the Hokey Pokey *IS* what it's all about?
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