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Sony Alpha and NEX Camera Systems
Sony cameras with interchangeable E-mount lenses.


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Old October 11th, 2016, 04:07 AM   #1
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Poor video from a5100 a focus issue?

A while back I bought an a5100 to use in multicam setup along with ax100 and others. Primarily to be used at university convocations as a wide shot camera with either the kit lens or a 55-20.
The issue is muddy video. It looks just fine when shooting but when viewing the mix, it is quite apparant that the video is drastically inferior to that of the ax100 or even the cx550v. At first I thought it was just soft but now I'm wondering if the very complicated focus system is screwing me around
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Old October 11th, 2016, 04:26 AM   #2
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Re: Poor video from a5100 a focus issue?

Soft focus could also be caused by diffraction, what lens was on the sony and what was the f-stop? 2 years ago I had to edit a wedding that included some a5100 footage and I remember it being more detailed then a nex-ea50 that was used as a-cam. If it can't match a cx550 in detail then something has to be wrong.
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Old October 11th, 2016, 06:00 AM   #3
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Re: Poor video from a5100 a focus issue?

used 2 lenses the 16-50 @50 and a 55-210 @55 (similar results)
kept the fstop at the supposid sweet spot of about 8. The focus system is so complex in the options that I'm starting to think I might stop worrying about potential diffraction and start shooting this scene at f16 or even 22 to fully engage deep dof because when shooting close ups the a5100 is as good as any, it's the wide shots where it is soft/muddy/out of focus. Could be it is picking some spot in the near ground to focus on. I need a lesson on this cam I think
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Old October 11th, 2016, 06:11 AM   #4
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Re: Poor video from a5100 a focus issue?

Don't you have a way to check focus like peaking or screen magnification?
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Old October 11th, 2016, 06:24 AM   #5
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Re: Poor video from a5100 a focus issue?

it looks ok during the shoot
The cam itself does not record. I use the hdmi out to a mixer with the other cameras
maybe its something to do with the hdmi out settings
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Old October 11th, 2016, 07:32 AM   #6
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Re: Poor video from a5100 a focus issue?

Does it have picture profile adjustments, if so is sharpness turned down?
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Old October 11th, 2016, 09:59 AM   #7
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Re: Poor video from a5100 a focus issue?

there a 22 menu items regarding focus any one of which could be amiss
Oh how I long for the simplicity of a range-finder focus system
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Old October 11th, 2016, 11:44 AM   #8
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Re: Poor video from a5100 a focus issue?

Changing shutter speed which I'm assuming they call framerate does make a difference. Much sharper recording when the a5100 outputs thru hdmi 1080p shutter 1/60 than 1080p 1/250 although mI hink at the venue i would have used 1/30 same as the ax100

LiveWedge officially supports the following resolutions and frame rates. If the device connected to LiveWedge does not output one of the below resolutions and frame rates, LiveWedge may not work correctly.

Supported HDMI resolutions and frame rates

HDMI inputs

480i/60 (59.94)Hz
576i/50Hz
480p/60 (59.94)Hz
576p/50Hz
720p/60 (59.94)Hz
720p/50Hz
1080i/60 (59.94)Hz
1080i/50Hz
1080p/60 (59.94)Hz
1080p/50Hz
640480/60Hz
800600/60Hz
1024768/60Hz
1280768/60Hz
12801024/60Hz
1366768/60Hz
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