Thanks Tim,
So the lens must report focus distance to get all 5 axes stabilized
which explains why some non OSS Sony lenses are reported to have about
4.5 stops of stabilization. Perhaps the firmware
will be modified to allow manual input of focus distance with MF alts.
(My initial reaction to reading the German translation was ARGHHH!!!)
The stabilization in video doesn't appear as good as Oly's at first
glance in one review:
http://www.eoshd.com/2014/11/sony-a7-ii-review-5-axis-stabilisation-video-mode/
No great shakes Mike
Tim H writes:
I have an opinion on the contrast and flare etc with a little testing I
did, which I can share another time. Suffice to say the higher the
dynamic range of the sensor, the worse the star bursts look shooting
directly a led flashlight beam (sun etc), apart from any differences in
reflection of light off the sensor surface. A camera with a low
sensitivity sensor will look much better than a high sensitivity one
for example,at the same exposure fstop/shutter speed. You can do a
simple test yourself. Set a speed/aperture combo and vary the ASA and
look at what it does to the starbursts from a flashlight at night.
Here is a google translate from the German minolta/sony group about the
IS functions.
This commentator is the group moderator and is usually pretty accurate
in his comments.
To understand the comments: E mount lenses are the new Nex series and
later A7 lens mounts. The older A mount is is the minolta mount dating
back to the mid 80's and carried forward on Sony's larger DSLR's with
pentaprisms. There is an electronic adapter that allows Amounts to be
used on Emounts which has a motor for moving mecahnical parts of
Amount. So I have a Minolta 50mm F1.7 for example I have been playing
with,but I still prefer the Zuiko 50mm f1.8 though.
Dear Members,
certainly is the integrated five-axis image stabilizer of the new
Sony ILCE 7M2 (7 Alpha II), the main innovation of this full frame
camera, and even the entire system. I think we can assume that this
image stabilizer will hold the future in all larger E-mount enclosures
too, as in all A-mount enclosures.
ILCE_7M2_5_axis_stabilizer.jpg (148.17KB) Number of downloads: 8
Axis 1: nod - vertical rotatory tilt (pitch / "Y" -Tilt)
Axis 2: Yaw - horizontal rotatory pivoting (yaw / "X" -Tilt)
Axis 3: horizontal translation - parallel shift in the horizontal
direction (Sway / X-Shift)
Axis 4: vertical translation - parallel shift in the vertical
direction (Heave / Y Shift)
Axis 5: Roles / falter - rotation around the optical axis (roll)
(6 axis: distance change - parallel shift back and forth along the
optical axis (Surge / Z-Shift))
The previous anti shake and SteadyShot in A-mount housings stabilized
only the axes 3 and 4, whereas lens-side image stabilizers axes 1 and 2
stabilize in E-mount lenses.
That Sony ever bring out a chassis-based image stabilizer for E-mount
cameras, so begrßenswert as surprising there are in the E-mount lens
system, a wide range of lenses, which itself via an optical
stabilization (OSS = Optical Steady Shot) have - and from Sigma-A-mount
lenses with lens side stabilization (OS Optical Stabilizer), we know
that not both systems may be active simultaneously, since it can easily
happen otherwise, that the camera But Schütte conclusions not
compensated, but be strengthened. So how the five-axis stabilizer work
with lenses that have an optical stabilization?
Well, unlike Sigma system which operates entirely independent lens
and only the power of the camera needs (and therefore operates only
with cameras with eight contacts), found in Sony's solution to
communicate with the camera instead - with the result that the lens
side stabilizer may also be used by the camera integrated system, if it
leads to a better result.
One must distinguish a number of cases here:
E-mount lenses without OSS
The stabilization for all five axes (1, 2, 3, 4 and 5) is done via
the five-axis image stabilization of the camera.
An exception is made for use with front converters that change the
focal length (such as VCL ECF1 and VCL ECU1 for the SEL-16F28 and
SEL-20F28 and VCL ECF2? And VCL ECU2? For the SEL-28F20). In such
cases, the resulting focal length must be entered on the focal length
of the camera menu (see below), and the stabilization reduces to the
axes 1, 2 and 5. FIG.
E-mount lenses with OSS
In the general case of the OSS of the lens takes over the
stabilization of the axes 1 and 2, whereas the axles 3, 4 and 5 can be
stabilized on the camera side through the movable sensor.
However, there are two exceptions:
The OSS lenses SEL-P1650 SEL-1855, SEL and SEL-55210 18200LE not use
their stabilizer, instead, takes over the camera side stabilizer to
stabilize all five axes, as if it was non-OSS lenses. Whether the
camera automatically takes this decision on the basis of data stored in
the lens or whether it is a hard-wired (and, if necessary, only through
firmware updates extensible) are exceptions list with these lenses in
the camera's firmware is not yet known.
Sony itself, there is no front Converter for OSS lenses, but should
such lenses with focal length changing front converters used by
contractors, the resulting focal length must be entered using the
camera's menu, and the overall system then stabilizes only the axes 1,
2 and . 5
A-mount lenses
As with E-mount lenses without OSS operating at about LA-EA1, EA2
LA-LA-LA-EA3 or EA4 coupled A-mount lenses, the five-axis stabilization
in the camera. The following cases must be distinguished:
If it is a lens with built-in distance encoder (all lenses with eight
contacts are included, provided they are operated directly or eight
pole teleconverter or rings and it is not to xi lenses), all five axes
(1, 2 , 3, 4 and 5) stabilized. This is also true for Sigma lenses
with OS, but it must be disabled by the user - alternatively you can
also work with Sigma's OS, but then the camera side stabilizer must be
disabled. In general it can be said that all lenses with the
identifiers ( D), SSM or SAM have eight contacts, but since the Sony
identifier ( D) has not taken there at Sony also quite a number of
lenses without identifiers that have eight contacts (and distance
encoder).
If it is a lens without distance encoder (ie all lenses with five
contacts and all xi lenses and eight-pole lenses using teleconverters,
extension tubes or bellows with five contacts), which has no special
macro mode (or this is not activated) so only the axes 1, 2 and 5 can
be stabilized. Among the published by Sony lenses, there are only five
pieces that do not have built-in distance encoder feature (SAL-16F28
SAL-20F28 SAL-28F28 SAL-135F28 SAL-500F80) at Minolta and Konica
Minolta concerned the all lenses, which no (D) contributed in the
name.
In the event that there is a lens with macro mode is enabled (which
it was for Minolta times six pieces , all lenses with five contacts),
the image stabilizer may nevertheless all five lines (1, 2, 3, 4 and 5
) stabilize. This is of course not for those copies of these lenses,
the so modified that they also support in macro mode autofocus - these
are then stabilized only in the axes 1, 2 and 5 (and whether this will
succeed well in the macro range, must yet to be tested).
If A-mount lenses with focal length changing front converters used
(Foreign Companies), the resulting focal length must be entered using
the camera's menu, and the overall system stabilizes then in each case
only the axes 1, 2 and 5. FIG.
Electronically adapted foreign lenses
Electronically adapted foreign lenses must distinguish two cases:
Adapters that turn the lens protocol of the foreign lens more or less
completely to the E-mount protocol ( such as Canon EOS lenses:
Metabones EF-E Smart Adapter MB-EF-E-BM1 / 2/3/4, Metabones Speed
Booster MB_SPEF e-BM1 / 2, Deotech Techart Falcon EOS-NEX / II / III,
King Mount Adapter EF-e (α), Viltrox EF Mount Adapter NEX, commlite
Mount Adapter NEX-CM-EF, or eg for Contax G lenses: Deotech Techart
(Golden) Eagle TA GE1A / TA EN1B / TA-GA2 / TA-GA3) and those who
simply an objective of fixed focal length and without removal set to
"simulate" (like many later with chips provided MF lenses which have
been adapted for the A-mount lens, but also as the Sigma 1.6x AF
Multi-Converter MD-MA and MA Ai-Minolta SR and Nikon F lenses).
In the first case, there is at least the theoretical possibility that
the adapter converts in the existing lens distance information
correctly and, if necessary, even communication with a possibly present
in the lens image stabilizer. From the perspective of a camera lens
would then be adapted in such a indistinguishable from a real E-mount
lens; the camera could therefore also all five lines (1, 2, 3, 4 and
5) stabilize, if necessary. even with the aid of a lens-side stabilizer
(otherwise this would, if present, is absolutely off as described
above). At the very least, we can assume that these adapters transmit
the focal length of the attached lens properly. This information is
already enough to the camera side to allow stabilization of axes 1, 2
and 5. Which allow the addressed adapter if necessary. More, we have
to find out by tests.
This also works with "rechippten" MF-A-mount lenses for as long as
the chip reflect the focal length of the lens correctly (which was not
always the case in the early stages of such solutions). The Sigma 1.6x
Mount Converter also fall into this category, because they simulate a
50mm lens - a lens should therefore connected with approximately this
focal length be no problems in this regard are to be expected. Still,
it may be more appropriate in most cases to adapt Minolta SR and Nikon
F lenses directly to glassless E-mount cameras to avoid the usually
undesirable "teleconverter effect". Thus, although you lose autofocus
and the camera-side adjustability of the diaphragm, but since it is a
five-pin adapter that is anyway no distance information, you lose in
terms of image stabilization nothing: There are so or only the three
axes 1, 2 and 5 stabilized.
Corresponds to the transmitted focal length tatsächlchen not the
focal length of the lens, it must be set on the camera side (this is
also true in conjunction with front converters).
Purely mechanically adapted foreign lenses
The effective focal length of the lens (incl. Possibly. Existing
converter) must be set on the camera side. The camera's menu offers
here in stages focal length settings between 8mm and 1000mm on. The
camera can then stabilize the axes 1, 2 and 5.
Many size,
Matthias
------------------------------------------------------------
From: Mike Gordon via olympus <olympus@xxxxxxxxxxxxxxxxx>
To: olympus@xxxxxxxxxxxxxxxxx
Sent: Saturday, November 29, 2014 2:36 PM
Subject: Re: [OM] Sony A7II, IS more info
In the Sony supplied graphic if the lens has OSS the OSS, takes care of
the pitch/yaw stabilization, and the IBIS takes care of the rotational
and X/Y part.
I didn't see anything that implied that 5 Axis IBIS isn't available for
unstabilized lenses though. I hope that German group is incorrect.
Wouldn't make sense if the
IBIS is an up-sized Oly system.
Here is one common example of sensor flare on the A7--prominent on
night shots with the A7:
https://farm6.staticflickr.com/5606/15650158060_7e78bbac62_b.jpg
Note multicolored reflections--these are independent of the lens used.
Early informal testing suggests the sensor stack on the A7II has
changed and this cam may be free of this effect.
Mike
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