Full zoom with OIS shadowing corners at DVinfo.net

Charles Dasher · January 23rd, 2008, 10:53 PM

I am not sure if this should go in the vignetting thread as this problem seems a bit different.

My camera came back from California re-aligned. This morning I shot some surfing with clear blue skies. At full telephoto with the OIS on there is substantial shadowing in the corners as the camera pans. Testing at home on the ceiling it seems to improve with the OIS off.

Can some let me know if there camera is totally free from this effect.

If I am shooting on sticks it is not a problem to shut the OIS off but if I am zoomed in handheld, when the OIS is most beneficial, the shadowing effect renders the OIS unusable IMHO.

I put a sample of this up on BLIP

http://blip.tv/file/619918?filename=...estClip536.mov

Thanks
Dasher

Alister Chapman · January 24th, 2008, 03:49 AM

Could also be the iris being close to fully closed.

Charles Dasher · January 24th, 2008, 07:05 AM

I will test a bit more today but the iris was pretty open with the ND2 and a 120 shutter speed.

Piotr Wozniacki · January 24th, 2008, 07:21 AM

Doesn't look good. I guess the fall-off effect is exaggerated by some evident colour banding - evidently insufficient blue color resolution... How did you encode it?

Steven Thomas · January 24th, 2008, 07:56 AM

Yes, it does seem a bit much. Also, the OIS moves it around quite a bit.
The color banding is from the highly compressed internet file.

Paul Joy · January 24th, 2008, 08:04 AM

I'm pretty sure this is inherent in the lens, I've seen a similar natural vignetting at the far end of the zoom too. I had to bin a shot last week for the same reason.

It's different from the other vignetting issue though, it just feels like a limitation of the lens rather than an alignment problem etc.

Charles Dasher · January 24th, 2008, 09:48 AM

Thanks for the feedback

This concerns me because these are the conditions I will be using the EX in much of the time. Blue sky background and zoomed in completely.

Paul were are you seeing this effect with the OIS off?

I truly want to work with the EX but if this is an inherent limitation of the lens then I may not be able to work around it. Would you all consider this a deffect?

Paul Joy · January 24th, 2008, 11:12 AM

Hi Charles

OIS was off and I didn't notice the effect until I reduced the video in size to 640 wide (it was for web delivery). Once reduced the effect seemed to be more apparent.

It doesn't look as bad as yours though, probably due to the OIS being off. Personally I'm not worried about it for my needs but it certainly ruins that shoot you have posted.

Screen grab attached

Paul

Charles Dasher · January 24th, 2008, 02:01 PM

I just got in from shooting and testing the tele end of the zoom range with OIS off. Now that I am looking for it is quite easy to see in the VF. It is there all the time but dose not jump into the frame as much when I pan.

I called my dealer and showed him the clip. He said he forwarded it on to the SONY rep.

From the limited feed back I have received from 2 other EX owners, they are seeing it as well. One stated he has returned his camera. This was someone who commented on the blip.tv site.

I am still very interested to hear if anyone has EX's that do not exhibit this problem at all.

Thanks for any info.

January 23rd, 2008, 10:53 PM	#1
Charles Dasher Regular Crew Join Date: May 2006 Location: Juno Beach FL Posts: 169	Full zoom with OIS shadowing corners I am not sure if this should go in the vignetting thread as this problem seems a bit different. My camera came back from California re-aligned. This morning I shot some surfing with clear blue skies. At full telephoto with the OIS on there is substantial shadowing in the corners as the camera pans. Testing at home on the ceiling it seems to improve with the OIS off. Can some let me know if there camera is totally free from this effect. If I am shooting on sticks it is not a problem to shut the OIS off but if I am zoomed in handheld, when the OIS is most beneficial, the shadowing effect renders the OIS unusable IMHO. I put a sample of this up on BLIP http://blip.tv/file/619918?filename=...estClip536.mov Thanks Dasher

January 24th, 2008, 03:49 AM	#2
Alister Chapman Inner Circle Join Date: Dec 2005 Location: Bracknell, Berkshire, UK Posts: 4,957	Could also be the iris being close to fully closed. __________________ Alister Chapman, Film-Maker/Stormchaser http://www.xdcam-user.com/alisters-blog/ My XDCAM site and blog. http://www.hurricane-rig.com

January 24th, 2008, 07:21 AM	#4
Piotr Wozniacki Inner Circle Join Date: Aug 2006 Location: Poland Posts: 4,086	Doesn't look good. I guess the fall-off effect is exaggerated by some evident colour banding - evidently insufficient blue color resolution... How did you encode it? __________________ Sony PXW-FS7 \| DaVinci Resolve Studio; Magix Vegas Pro; i7-5960X CPU; 64 GB RAM; 2x GTX 1080 8GB GPU; Decklink 4K Extreme 12G; 4x 3TB WD Black in RAID 0; 1TB M.2 NVMe cache drive

January 24th, 2008, 08:04 AM	#6
Paul Joy Major Player Join Date: Mar 2007 Location: Norfolk, UK Posts: 627	I'm pretty sure this is inherent in the lens, I've seen a similar natural vignetting at the far end of the zoom too. I had to bin a shot last week for the same reason. It's different from the other vignetting issue though, it just feels like a limitation of the lens rather than an alignment problem etc. __________________ Blog: www.pauljoy.com Company: www.videotrader.co.uk

January 24th, 2008, 11:12 AM	#8
Paul Joy Major Player Join Date: Mar 2007 Location: Norfolk, UK Posts: 627	Hi Charles OIS was off and I didn't notice the effect until I reduced the video in size to 640 wide (it was for web delivery). Once reduced the effect seemed to be more apparent. It doesn't look as bad as yours though, probably due to the OIS being off. Personally I'm not worried about it for my needs but it certainly ruins that shoot you have posted. Screen grab attached Paul Attached Thumbnails __________________ Blog: www.pauljoy.com Company: www.videotrader.co.uk Last edited by Paul Joy; January 24th, 2008 at 11:48 AM.

January 24th, 2008, 07:05 AM	#3
Charles Dasher Regular Crew Join Date: May 2006 Location: Juno Beach FL Posts: 169	I will test a bit more today but the iris was pretty open with the ND2 and a 120 shutter speed.

January 24th, 2008, 07:56 AM	#5
Steven Thomas Trustee Join Date: Sep 2005 Location: Gilbert, AZ Posts: 1,896	Yes, it does seem a bit much. Also, the OIS moves it around quite a bit. The color banding is from the highly compressed internet file.

January 24th, 2008, 09:48 AM	#7
Charles Dasher Regular Crew Join Date: May 2006 Location: Juno Beach FL Posts: 169	Thanks for the feedback This concerns me because these are the conditions I will be using the EX in much of the time. Blue sky background and zoomed in completely. Paul were are you seeing this effect with the OIS off? I truly want to work with the EX but if this is an inherent limitation of the lens then I may not be able to work around it. Would you all consider this a deffect?

January 24th, 2008, 02:01 PM	#9
Charles Dasher Regular Crew Join Date: May 2006 Location: Juno Beach FL Posts: 169	I just got in from shooting and testing the tele end of the zoom range with OIS off. Now that I am looking for it is quite easy to see in the VF. It is there all the time but dose not jump into the frame as much when I pan. I called my dealer and showed him the clip. He said he forwarded it on to the SONY rep. From the limited feed back I have received from 2 other EX owners, they are seeing it as well. One stated he has returned his camera. This was someone who commented on the blip.tv site. I am still very interested to hear if anyone has EX's that do not exhibit this problem at all. Thanks for any info.