On 10/13/2014 6:31 PM, Chuck Norcutt wrote:
Why do you need an Imatest? If you can't see it with your eye well...
you can't see it. Who wants to carry a shot filled bag for a
lightweight camera? If >>you consider it critical (I don't) then test
with and without a shot filled bag. If you can see a difference then
get rid of the camera *and* the shot filled >>bag and get a different
camera.
Weightless Moose responds
You tell 'em, Chuck!
Weightless Moose and Dr. Focus ganging up on speculative Mike, huh. I
do see your point but subjective endpoints with images are much more
problematic to use in order to characterize the nature and extent of an
effect when only a subtle residual exists. Imatest is an objective
reproducible technique.
Sony denies(d) Shutter shock (SS) exists at all on the A7r though ample
evidence existed in images that during some conditions it was obvious.
The Imatest data is unequivocal and defines the shutter speeds when SS
is an issue and the magnitude under tested conditions. Fortunately
The OM-D has on the quietest which correlates with least SS of any MFT
cam (no EFC used) and the 1/8 sec delay mitigates that. I would surmise
that on a tripod with a long light lens, some SS will remain. The A7r
was worse on a tripod especially if the cam hung off the back using a
lens with a tripod mount--normally expect that arrangement to be
better, but not with SS. Kudos to Oly in providing the firmware updates
to many of the MFT line but too bad it didn't seem to be possible for
the OM-D. The E-P5 had horrendous SS not immediately recognized as such
by DPRreview. It is not a cure all as it limits the shutter speeds
usuable, no burst mode, and no flash AFAIK. There can be odd artefacts
with moving subjects. In Nex with large apertures and fast speeds,
there are weird bokeh artefacts. I don't know if they would occur on
Oly MFT at speeds where EFC allowed. Oddly looking at the Oly manuals
the 0sec antishock setting is massively downplayed and difficult to
find as not even indexed in the one cam manual looked at.
If buying a cam with 36 megapickles, I don't want the image blurred
over several pixels and want full use of all pickles.
Speculative Shocked Mike
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