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Sony A99 video fault

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pantic View Drop Down
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Post Options Post Options   Quote pantic Quote  Post ReplyReply Direct Link To This Post Topic: Sony A99 video fault
    Posted: 13 November 2017 at 14:08
At still shootin mode when I push video button, quality is awfull with auto iso.
What probably cause this blurring problem ?
https://www.youtube.com/watch?v=b5Z6MZ6IR0s

 



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stiuskr View Drop Down
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 13 November 2017 at 17:47
Not sure. Have you tried changing your auto ISO settings? Put them both at their upper and lower max. limits and see what happens.
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pantic View Drop Down
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Post Options Post Options   Quote pantic Quote  Post ReplyReply Direct Link To This Post Posted: 13 November 2017 at 20:12
A99 have not auto iso limits. I've tried maybe all settings and only what have an effect is set iso manual. All contrast and sharpening off, lens corrections off,stabilsatin off, hdr off.
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sybersitizen View Drop Down
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 13 November 2017 at 20:48
Originally posted by pantic pantic wrote:

A99 have not auto iso limits.

Yes, it does.

I've tried maybe all settings and only what have an effect is set iso manual. All contrast and sharpening off, lens corrections off,stabilsatin off, hdr off.

What lens did you use? What File Format (AVCHD or MP4)? What Record Setting? I can test my A99 with the same settings and see what happens.
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Post Options Post Options   Quote pantic Quote  Post ReplyReply Direct Link To This Post Posted: 13 November 2017 at 21:51
Yes indeed there are limitations I just had not ever needed. The squirrel in video 70-210 beercan but appears on all lenses. The problem is displayed in all video formats, though 50p is perhaps better. Normally I use mp4 format, manual mode, center autocus, center weigted exposure, stabilization on. I shoot motor sports and no art videos. The small size of the video is the most important thing.
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Post Options Post Options   Quote Photosopher Quote  Post ReplyReply Direct Link To This Post Posted: 14 November 2017 at 00:07
Originally posted by pantic pantic wrote:


What probably cause this blurring problem ?
https://www.youtube.com/watch?v=b5Z6MZ6IR0s


It looks to me like you may have Steady Shot set to manual mode and have the wrong focal length dialed in.
That's a lot of weird panning back and forth with jittering.

I sure hope you remove that video after isolating your problem.
The title suggests that it is "a99II video fault". A bit unfair and misleading until the problem is determined.
Good quality video requires good quality technique from operator.
 



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stiuskr View Drop Down
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 14 November 2017 at 02:13
With video wouldn't you be better off staying with a fixed ISO instead of auto? Unless you're piecing together a bunch of 3 second clips?
Rob Suits Jr.
a99M2 a99 a77 a700 KM7D|Min24/2.8 Min35/2 So50/1.4 So50/2.8 Min85/1.4G Tam90/2.8 Tam180/3.5|Tam17-50 KM28-75D So70-200G1 So70-300G So70-400G1|MFC-1000w/1200AF Metz54MZ-4i SonyF60
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Post Options Post Options   Quote pantic Quote  Post ReplyReply Direct Link To This Post Posted: 14 November 2017 at 08:38
I shoot moto trial in the dark forest and sunlit cliffs under varying lighting conditions so auto iso. I take still pictures and videos crosswise and there is often no time or remember to change settings when the contest is running. The pictures I take with the m position and would be the fastest push just the video recording button without the rotation of the dial. The problem with trial videos is still worse than the squirrel video.
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 14 November 2017 at 17:36
Originally posted by Photosopher Photosopher wrote:

It looks to me like you may have Steady Shot set to manual mode and have the wrong focal length dialed in.

The A99 has no way to manually enter a focal length - but I suppose it could have some kind of SS problem.

For the OP:

Have you clearly established that you do not see this problem when using manual ISO at the ends or midpoint of the ISO range (100, 800, 6400)? Note that ISO for video is limited to the range of 100-6400, even when using Auto ISO.

Possibly Auto ISO is choosing a very low number, which would require a long shutter speed, which would cause a lot of motion blur - especially in shade and the 'dark forest' scenes you mentioned.

A little experimentation with my own A99 seems to support this hypothesis. Shooting a heavily shaded scene with Auto ISO produces motion blur that looks similar to shooting the same scene with ISO 100. The motion blur disappears as ISO is raised. (I have autofocus enabled, which always limits the aperture to nothing wider than f/3.5. Are you also using autofocus?)
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pantic View Drop Down
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Post Options Post Options   Quote pantic Quote  Post ReplyReply Direct Link To This Post Posted: 14 November 2017 at 20:00
Yes I use autofocus. The quick test gave the results that the problem comes when the shutter speed drops to 1 / 25s, so indeed iso goes too low. I have to test more tomorrow in the woods. Thanks for the tips!
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Post Options Post Options   Quote pantic Quote  Post ReplyReply Direct Link To This Post Posted: 15 November 2017 at 09:30
The problem did not resolve but the cause came to light. It's a shutter speed that drops too down . I just need to find a right settings for the auto iso limits, that is suitable for both video and still images and change settings when I come from a forest to a brighter place. Thanks for the tips!
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 15 November 2017 at 10:37
Most movies are shot using a 180 degree shutter speed meaning the shutter speed is locked at half the frame rate. I would try that and then allow auto ISO to choose any value. That will give a normal a mount of motion blur.

The fully auto mode also tries to keep the shutter speed at half the frame rate.
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stiuskr View Drop Down
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 15 November 2017 at 12:23
Originally posted by pantic pantic wrote:

...I just need to find a right settings for the auto iso limits, that is suitable for both video and still images and change settings when I come from a forest to a brighter place...


When you do find the settings that work you can then assign them to the Memory mode.

Pg. 190
Rob Suits Jr.
a99M2 a99 a77 a700 KM7D|Min24/2.8 Min35/2 So50/1.4 So50/2.8 Min85/1.4G Tam90/2.8 Tam180/3.5|Tam17-50 KM28-75D So70-200G1 So70-300G So70-400G1|MFC-1000w/1200AF Metz54MZ-4i SonyF60
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 15 November 2017 at 17:37
Originally posted by QuietOC QuietOC wrote:

Most movies are shot using a 180 degree shutter speed meaning the shutter speed is locked at half the frame rate. I would try that and then allow auto ISO to choose any value. That will give a normal a mount of motion blur.

You're talking about using S mode to guarantee a specific shutter speed? The big problem with that plan is that video autofocus is not available in S mode (or A or M mode).

If you need video autofocus, P is the only mode available, and the aperture is locked at f/3.5 or smaller. That means the shutter speed will always float as needed ... and Auto ISO will of course float as well, leaving virtually no user control.

Since Auto ISO seems to lean toward the low numbers, the best solution to avoid blur is to manually choose the optimal ISO for the specific scene.
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