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Re: [OM] Just anounced A7R ii ,New variant. Impressive technology

Subject: Re: [OM] Just anounced A7R ii ,New variant. Impressive technology
From: Hughes <timhughes@xxxxxxxx>
Date: Thu, 11 Jun 2015 18:01:38 +0000 (UTC)
Interesting, they don't have an anti-aliasing filter. 
This makes a lot of sense for a 42Mpix sensor, as the resolution of most 
lenses,and the depth of focus,will act as a built in anti-alias filter at that 
resolution.Tim Hughes

      From: Hughes <timhughes@xxxxxxxx>
 To: Olympus Camera Discussion <olympus@xxxxxxxxxxxxxxxxx> 
 Sent: Thursday, June 11, 2015 10:54 AM
 Subject: Re: [OM] Just anounced A7R ii ,New variant. Impressive technology
   
here is DPReview link which got removed in my post, by mailer:
http://www.dpreview.com/articles/8917769536/sony-alpha-a7r-ii-has-42-4mp-on-full-frame-bsi-cmos-sensor
     From: Hughes <timhughes@xxxxxxxx>
 To: Olympus Camera Discussion <olympus@xxxxxxxxxxxxxxxxx> 
 Sent: Thursday, June 11, 2015 10:32 AM
 Subject: [OM] Just anounced A7R ii ,New variant. Impressive technology
  
We will have to see how it tests, but being an engineer,I find the new 
technology, introduced sounds pretty interesting.
At a very quick skim of advertising hype, they seem to have made a FF sensor 
using their backilluminated "stacked" sensor technology ,first introduced in 
small sensors (where it makes a bigger difference).  PLUS they are stacking 
memory chips onto the back of sensor , so there is some direct faster parallel 
memory path to DRAM. They also have a completely electrical shutter mode you 
can select, for stealthier shooting.

Sony a7R II has 42.4MP on 4K-capable full-frame BSI CMOS sensor
There are also a couple of intermediate size cameras with similar sensors, at 
lower price points.
>>Sony has announced the a7R II, a 42.4MP mirrorless camera with an image 
>>stabilized full-frame BSI CMOS sensor. Unlike its predecessor, the camera 
>>includes on-sensor phase detection elements for faster autofocus, which 
>>continues to work with other brands' lenses. The camera also has a revised 
>>shutter mechanism, rated to 500,000 actuations but also promising less 
>>vibration than the one on its predecessor. The sensor is by far the largest 
>>backside illuminated CMOS chip to be released, allowing the maximum expanded 
>>ISO to rise two stops to 102,400. The camera will cost around $3,200.The a7R 
>>II also gains 5-axis image stabilization that is rated at 4.5 stops, 
>>according to CIPA standard.The camera can capture 4K (UHD) video at 30p/25p 
>>or 24p in the XAVC S 4K format. The 4K video can be taken either from the 
>>full sensor width or from a Super 35 crop. Even this smaller crop 
>>over-samples by around 1.4x.
With Amount lenses:
Sony says the on-sensor phase-detection AF can be used with A-mount lenses 
using the simpler LA-E3 adapter, rather than the LA-E4 that had an SLT 
mechanism built in. At the press launch in New York we even got a glimpse of 
the a7R II autofocusing Canon EF lenses using a Metabones electronic adapter. 
Focus appeared to be on par with OVF focus on a native Canon body, and the AF 
experience itself didn't appear to be limited simply because you're using a 
third party lens (full coverage and tracking are available).On-sensor phase 
detection elements cover 45% of the sensor, which may sound small but actually 
translates to around 67% coverage in each direction. While this is some way 
behind level of coverage offered on Samsung's NX1 (or even Sony's APS-C 
cameras), it's still a considerably larger area than that covered by any full 
frame DSLR's focus sensor.It also gains an electronic first curtain shutter 
option to eliminate shutter vibration, which was a problem with the original 
a7R at longer focal lengths. It also offers a fully electronic silent 
shutter.<<<
Tim Hughes
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