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Sony Alpha a7s: Full HD Recording in XAVC and 4:2:2 UHD 4K Output via HDMI.


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Old March 11th, 2015, 11:07 AM   #1
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Dark band in upper part image, with short shutter speeds

I noticed something very awkward with my Sony A7: when using a vintage Nikon lens (any older manual Nikkor), with an adapter, and a very short shutter speed (1/4000th of a second), I get a very dark band in top of the image (picture 1). This happens only with short shutter speeds, if I choose a longer exposure, for example 1/400th, the banding is gone (picture 2). With the Zeiss 24-70 it is also gone. Anyone have any idea what could cause this?
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Dark band in upper part image, with short shutter speeds-4000sec.jpg   Dark band in upper part image, with short shutter speeds-400sec.jpg  

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Old March 13th, 2015, 04:00 AM   #2
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Re: Dark band in upper part image, with short shutter speeds

I just found this last weekend - I was shooting with a Nikon 70-300 on my A7s at 1/8000 second and had exactly the same issue. I will post a photo later.
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Old March 13th, 2015, 07:35 AM   #3
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Re: Dark band in upper part image, with short shutter speeds

Here are a couple of images with the dark band - shot at 1/5000 sec. The band doesn't appear on pictures taken at a slower shutter speed. The lens was a Nikon 70-300 zoom with a cheap tube NEX- Nikon adapter.
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Dark band in upper part image, with short shutter speeds-dsc02000.jpg   Dark band in upper part image, with short shutter speeds-dsc02008.jpg  

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