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


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Old April 20th, 2015, 11:35 AM   #1
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Bristol Harbourside, England

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Old April 20th, 2015, 12:38 PM   #2
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Re: Bristol Harbourside, England

Kevin, does the focus in this look right to you?

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Old April 20th, 2015, 03:15 PM   #3
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Re: Bristol Harbourside, England

Quote:
Originally Posted by Andrew Smith View Post
Kevin, does the focus in this look right to you?

Andrew
Unless it's just the youtube encoding, certainly looks too soft here... How does a frame capture look?
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Old April 20th, 2015, 03:25 PM   #4
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Re: Bristol Harbourside, England

I am finding there's a definite loss of quality when uploaded to YouTube.
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Old April 21st, 2015, 07:13 AM   #5
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Re: Bristol Harbourside, England

Kevin - in my opinion is something wrong with your lens. Definitelly bad loss of shapness near edges. And most time it looks worse on left then on the right side.
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Old April 21st, 2015, 08:24 AM   #6
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Re: Bristol Harbourside, England

Really noticeable at 0:38 - What lens/adapter are you using?
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Old April 22nd, 2015, 02:31 PM   #7
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Re: Bristol Harbourside, England

Ivan, I think you may be right about the lens. It appears to be worse on wide shots and better when zoomed in.

I used a Sony 18-105mm OSS F4 lens.

Looking at other videos I've shot using the Sony Zeiss FE 55mm lens, the softness isn't there.
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Old April 29th, 2015, 11:21 AM   #8
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Re: Bristol Harbourside, England

Is there anything that can be done if the lens is at fault?
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Old April 29th, 2015, 08:15 PM   #9
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Re: Bristol Harbourside, England

Yup. New lens.

You're welcome. :-)

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Old May 3rd, 2015, 03:09 PM   #10
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Re: Bristol Harbourside, England

Following some research, it appears this lens has some distortion problems when used with cameras without 'in camera' correction. Apparently the FS700 had a firmware update to sort the issue. I presume the A7s doesn't have this feature. Does anyone have any more info on this?
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Old May 3rd, 2015, 08:37 PM   #11
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Re: Bristol Harbourside, England

It's a bit of a concern that a lens has distortion that bad, and requires in-camera correction for it to be able to be usable.

I can always shoot some video footage with my A7II and upload if it helps. I've got the Sony FE 28-70mm lens on it (only $300-ish worth). You might find that the night and day comparative results enough that you wouldn't even mess around with that lens any more.

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Old May 3rd, 2015, 08:46 PM   #12
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Re: Bristol Harbourside, England

Actually, I've got a feeling that the flange distance in the camera mount for the lens will be what is doing this. If this is the case then the idea thing would be to have some sort of adapter. Else, use a crop factor mode when shooting with that lens.

Have a go at this (the crop mode) and see how it works for you.

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Old May 4th, 2015, 04:34 AM   #13
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Re: Bristol Harbourside, England

Thanks for the info. The FE 28-70mm is a very good value zoom. I'm sure it won't be as good as some of the other FE zooms but they're much higher priced. It could be a good back up to my FE 55mm Prime.
How do you find yours for video?
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Old May 4th, 2015, 07:26 AM   #14
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Re: Bristol Harbourside, England

Better for video than I was expecting. I've only done a few quick test shots to check out the recording ability and not any serious filming. I actually bought the camera for only shooting stills, having a Sony PMW-300 that I do my video shooting with.

Those more expensive FE mount lenses are made by Zeiss and have better optics. Apparently they are pretty dang impressive and you do get what you pay for. I just haven't had one of them to play with yet.

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Old May 4th, 2015, 07:45 AM   #15
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Re: Bristol Harbourside, England

He's a very rudimentary video that I shot with the camera and lens. I've barely even read the manual. The focus is hunting around but there is enough to give you an indication of the quality.

I've uploaded the raw .mts video file directly to YouTube and the camera would have been shooting video at roughly ASA2000 (based on on-screen feedback in photo mode).

Andrew

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