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Alex Pratt
登録日: 2012.01.17 記事: 35
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日時: Thu May 17, 2012 6:51 am 記事の件名: Shutter speed settings for Watec 902H2 camera |
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Hi SonotaCo,
I run my Watec 902H2 at its default (shipment) shutter setting. This is shutter mode OFF, which fixes the shutter speed to CCIR 1/50th. (I live in the UK).
I see in a previous topic, you said that you use
AE Mode Control 8 EI:OFF which is CCIR 1/50 - 1/100000
Why do you choose this setting?
Many thanks,
Alex. |
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SonotaCo Site Admin
登録日: 2004.08.07 記事: 12671 所在地: 139.67E 35.65N
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日時: Thu May 17, 2012 8:58 am 記事の件名: Re: Shutter speed settings for Watec 902H2 camera |
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Alex Pratt wrote: | I see in a previous topic, you said that you use |
which topic?
Well....
I am always saying that slow shutter nor frame stacking should not be used for motion detection.
But it is not concerning Watec 902H2Ultimage, because it has no such function.
The reason of not using slow shutter is that they decrease the contrast of moving objects
(brightens only slow or stopping objects (back ground) and not moving objects).
Also they decrease the time resolution and decrease the velocity measurement accuracy.
Faster shutter than field rate is not the problem for motion detection, but it decreases all lights so it will not be used for night sky naturally.
But EI and auto-iris might conflict each other and sometime cause so called "hunting". So EI:OFF is recommended for night sky.
OK? |
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Alex Pratt
登録日: 2012.01.17 記事: 35
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日時: Thu May 17, 2012 7:50 pm 記事の件名: Re: Shutter speed settings for Watec 902H2 camera |
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SonotaCo wrote: | Alex Pratt wrote: | I see in a previous topic, you said that you use |
which topic?
Faster shutter than field rate is not the problem for motion detection, but it decreases all lights so it will not be used for night sky naturally.
But EI and auto-iris might conflict each other and sometime cause so called "hunting". So EI:OFF is recommended for night sky.
OK? |
Hi,
Thank you for your helpful reply.
The topic I read about camera settings is '日時: Mon Jan 04, 2010 7:59 am 記事の件名: possiable settings for new camera.'
I use my Watec 902H2 for meteor detection, so I will now set my camera to use
Shutter Mode ON
AE Mode Control 8 EI : OFF
which should stop it 'hunting' in early twilight conditions.
Many thanks,
Alex. |
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