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Re: [OM] Sony A7II, IS more info

Subject: Re: [OM] Sony A7II, IS more info
From: Hughes <hi100@xxxxxxxxxxxxx>
Date: Sat, 29 Nov 2014 23:09:06 -0800
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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