Reading through the specs for the Sony FF cameras they mention that the signal
processing is done at two levels, analog preprocessing on sensor chip, along
with normal digital processing. But not only is there on chip preprocessing,
they do the A/D conversion on sensor chip, along with some digital processing.
It is not clear how the processing,control logic and DSP is parsed out,
but just doing the A/D conversion, gain setting,black level,RGB channel
ofsetting etc. is likely quite a lot of extra silicon along with potential heat
generation, which contributes to dark current noise. Quite gutsy with such a
large imaging chip to make it even bigger. One upside is data rates must be
very high with 24Mpixels, so may be a good thing not having to take signals off
chip before A/D conversion. Downside is potential extra digital noise coupling
into sensor.
Tim Hughes
--- On Tue, 10/6/09, usher99@xxxxxxx <usher99@xxxxxxx> wrote:
From: usher99@xxxxxxx <usher99@xxxxxxx>
Subject: [OM] OM to Sony alpha adapter-- f/u
To: olympus@xxxxxxxxxxxxxxxxx
Date: Tuesday, October 6, 2009, 9:43 AM
Hi Iwert,
I see what you mean regarding the orange ring. I don't have the
testosterone to perform potentially irreversible camera mount phlange
surgery to create FF digital film given the price of these things nice
as though it would be at base ISO. Being able to use some of that
nice Zeiss glass is another attraction of a non-destructive adapter.
The alphas really aren't that much less than a Canyon 5D11 with live
view that can work fine as digital film for Zuikos.
Mike
http://a.img-dpreview.com/news/0908/Sony_alpha/A850/DSLR-A850_front.jpg
Mike,
would it be possible to take the alpha mount out and replace it with
an OM-mount?
(that would do away with the horrid orange ring as well :). It should
just be 6 screws?
I suppose that sticking out lever can be hidden inside the extra
thickness of the OM-moun?
YouI wouldn't use AF glass anyway... would you?
Iwert
2009/10/5 <usher99@xxxxxxx>:
> Bah,
> As promised, I pinged my favorite oddball adapter fabricator:
> Technical advisor at Srb Griturn took another look. As Tim observed,
> the diameters of the OM and Alpha bayonets are almost identical
> and no easy way to have OM lens turn in the alpha throat turn and be
> able construct a latch/stopdown mechanism. Srb doesn't think it is a
> viable option.
> Would take some fancy engineering if it is even possible at all w/o
> mucking up the Sony.
>
> Mike
> --
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