Deactivated image stabilisation: is it completely switched "off"? at DVinfo.net

Michael Mann · December 21st, 2006, 10:04 AM

Shooting with deactivated image stabilisation does not look as if it is totally "off". I am wrong?
By the way: What happens mechanically when image stabilisation is deactivated?

Chris Hurd · December 21st, 2006, 10:16 AM

When shooting in Green Box (easy recording) mode, image stabilisation is actually on even though it might be turned off in the menu! Otherwise, maybe you're just talented in the skill of holding a camera steady by hand? I would like to think that's the case. A good test is to see how still you can get the image with OIS switched off while zoomed into full telephoto...?

I'm not sure, but I think when image stabilisation is deactivated, the Lens Shift mechanism returns to its center default position and doesn't move, making it transparent to the image acquisition process. But that's just a guess. Lens Shift uses two different image movement detection methods, gyro and vector, and it's probably safe to assume that they're simply switched off when OIS is disabled.

Michael Mann · December 21st, 2006, 10:35 AM

Quote:

Originally Posted by Chris Hurd

Otherwise, maybe you're just talented in the skill of holding a camera steady by hand? I would like to think that's the case. A good test is to see how still you can get the image with OIS switched off while zoomed into full telephoto...?.

I am flattered, thank you!
Seriosly, I have been shaking the A1 (OIS switched OFF) and it looks like there is a very slight motion delay followed by an acceleration, in principle like in OIS "on"-mode, but very damped.

John Huling · December 21st, 2006, 12:20 PM

I belieive this is the same thing I have seen on 2 different A1's. To me it looks like pulsing 2x per second.

Richard Hunter · December 22nd, 2006, 04:48 AM

Quote:

Originally Posted by Michael Mann

I am flattered, thank you!
Seriosly, I have been shaking the A1 (OIS switched OFF) and it looks like there is a very slight motion delay followed by an acceleration, in principle like in OIS "on"-mode, but very damped.

Hi Michael. Is it possible this is just viewfinder lag?

Richard

Michael Mann · December 22nd, 2006, 05:59 AM

Richard, I am not quite sure, since I did not record my "test shaking" yet, just watched it on the viewfinder. But I am going to verify this.

Michael Mann · December 22nd, 2006, 09:32 AM

Meanwhile I have recorded some "test shaking" with OIS switched OFF (25F, 1/50). The shaking looks very "good" (normal) in playback, like in good old shaky handheld 16 mm days.

So I got probably irritated by the delay of the display, which I find very noticable, compared to my sold FX1. But the A1 probably has to compute just a little more ...

Raymond Toussaint · December 22nd, 2006, 10:10 AM

Glad to hear that. Its no fault.

December 21st, 2006, 10:04 AM	#1
Michael Mann Major Player Join Date: Dec 2005 Location: Kelkheim, Germany Posts: 375	Deactivated image stabilisation: is it completely switched "off"? Shooting with deactivated image stabilisation does not look as if it is totally "off". I am wrong? By the way: What happens mechanically when image stabilisation is deactivated? __________________ Michael

December 21st, 2006, 10:16 AM	#2
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,368 Images: 513	When shooting in Green Box (easy recording) mode, image stabilisation is actually on even though it might be turned off in the menu! Otherwise, maybe you're just talented in the skill of holding a camera steady by hand? I would like to think that's the case. A good test is to see how still you can get the image with OIS switched off while zoomed into full telephoto...? I'm not sure, but I think when image stabilisation is deactivated, the Lens Shift mechanism returns to its center default position and doesn't move, making it transparent to the image acquisition process. But that's just a guess. Lens Shift uses two different image movement detection methods, gyro and vector, and it's probably safe to assume that they're simply switched off when OIS is disabled. __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

December 22nd, 2006, 05:59 AM	#6
Michael Mann Major Player Join Date: Dec 2005 Location: Kelkheim, Germany Posts: 375	Richard, I am not quite sure, since I did not record my "test shaking" yet, just watched it on the viewfinder. But I am going to verify this. __________________ Michael Last edited by Michael Mann; December 22nd, 2006 at 09:37 AM.

December 22nd, 2006, 09:32 AM	#7
Michael Mann Major Player Join Date: Dec 2005 Location: Kelkheim, Germany Posts: 375	Meanwhile I have recorded some "test shaking" with OIS switched OFF (25F, 1/50). The shaking looks very "good" (normal) in playback, like in good old shaky handheld 16 mm days. So I got probably irritated by the delay of the display, which I find very noticable, compared to my sold FX1. But the A1 probably has to compute just a little more ... __________________ Michael Last edited by Michael Mann; December 22nd, 2006 at 11:24 AM.

December 21st, 2006, 12:20 PM	#4
John Huling Regular Crew Join Date: Nov 2006 Location: USA Posts: 172	I belieive this is the same thing I have seen on 2 different A1's. To me it looks like pulsing 2x per second.

December 22nd, 2006, 10:10 AM	#8
Raymond Toussaint Regular Crew Join Date: Nov 2005 Posts: 173	Glad to hear that. Its no fault.