A7S left/right sensor split

Started Nov 29, 2015 | Discussions
sharkmelley
sharkmelley Senior Member • Posts: 1,715
A7S left/right sensor split

I'm noticing a curious feature in an astrophotography master flat frame.  I've taken 16 flat frames at ISO 100 and summed them.  Stretching the result I see a vertical (left/right) discontinuity precisely at the centre line of the sensor:

If I completely saturate the colour I see wide horizontal banding effect on the left hand side whilst the right hand side looks completely normal:

These effects appear to happen at all ISOs and on both telescopes and lenses.

I wonder what might be causing it?

Mark

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Sony a7S +1 more
Sony a7S
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exdeejjjaaaa
exdeejjjaaaa Veteran Member • Posts: 8,263
Re: A7S left/right sensor split
1

sharkmelley wrote:

I'm noticing a curious feature in an astrophotography master flat frame. I've taken 16 flat frames at ISO 100 and summed them. Stretching the result I see a vertical (left/right) discontinuity precisely at the centre line of the sensor:

If I completely saturate the colour I see wide horizontal banding effect on the left hand side whilst the right hand side looks completely normal:

These effects appear to happen at all ISOs and on both telescopes and lenses.

I wonder what might be causing it?

Mark

big sensors are manufactured from more than one exposure in lithography process

for example = http://blog.teledynedalsa.com/2012/02/the-art-of-making-large-image-sensors-or-quilting-with-silicon/

http://www.rawdigger.com/howtouse/rawdigger-histograms-overexposure-shapes = fig. 30

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Sony a7R II Sony FE 55mm F1.8 Phase One Capture One Pro +25 more
sharkmelley
OP sharkmelley Senior Member • Posts: 1,715
Re: A7S left/right sensor split

exdeejjjaaaa wrote:

big sensors are manufactured from more than one exposure in lithography process

for example = http://blog.teledynedalsa.com/2012/02/the-art-of-making-large-image-sensors-or-quilting-with-silicon/

http://www.rawdigger.com/howtouse/rawdigger-histograms-overexposure-shapes = fig. 30

Thanks for that very helpful reply.

Mark

 sharkmelley's gear list:sharkmelley's gear list
Sony a7S +1 more
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