Vignette problem at DVinfo.net

Paul Joy · November 20th, 2007, 04:44 PM

I've noticed that my EX1 is suffering from a vignette problem whilst in the mid zoom ranges. Have a look at the top left corner in these screen shots, you can see it's fine at each end of the scale, but throughout the middle ranges it appears.

This is happening with the IRIS fully open and in low light if that makes any difference.

Can this be solved?

Evan Donn · November 20th, 2007, 04:52 PM

not encouraging - Adam Wilt mentioned this in his review of the pre-release model here:

http://www.uemedia.net/CPC/cinematog...le_16640.shtml

Quote:

There is vignetting at wide apertures from 10mm onwards, but Sony tells me that it's due to a bug in this engineering sample's auto-focus system, so I'll refrain from further commentary until I have a production model to work with.

Steven Thomas · November 20th, 2007, 04:54 PM

What the...
That's odd it's in one corner! Also in mid travel?
Wow, we need to tests these cam as soon as possible.
This should not be happening.
Why one corner?

I thought I read that in Wilt's article for the pre-ex1..... hmmmm.
Sony is going to have A LOT of upset buyers, or not buyers.

Craig Seeman · November 20th, 2007, 04:57 PM

Try shooting something with a solid color. It might make it more obvious.
Note, Adam's comments mention this specific it wide apertures at 10mm on so this seems like a different issue.

Paul Joy · November 20th, 2007, 04:57 PM

Yup, well they'll certainly be getting this one back :(

Steven Thomas · November 20th, 2007, 05:00 PM

It's as if something is hanging on the edge of the optical path.

Craig Seeman · November 20th, 2007, 05:02 PM

Are you using any kind of clear or UV filter on the front?

Maybe you can slow zoom through and see something that might indicate what/why this is happening.

Paul Joy · November 20th, 2007, 05:06 PM

In order to do a solid colour one I need more light and a larger area, I'll try it tomorrow against a wall.

No, there is not a filter attached.

Paul Joy · November 20th, 2007, 05:10 PM

Quote:

Originally Posted by Craig Seeman

Note, Adam's comments mention this specific it wide apertures at 10mm on so this seems like a different issue.

he says "from 10mm onwards" That sounds the same to me as the aperture is fully open.

Steven Thomas · November 20th, 2007, 05:10 PM

Paul, I'm sorry to hear this. Looking at the stuff posted on the FTP site I do not see this issue.
I would contact my dealer as soon as possible and get the next one before they send it out to someone else. I know these cameras are going to be hard to get.
It sounds like Craig is right, this seems like a different issue from Wilt's pre-model.

Craig Seeman · November 20th, 2007, 05:11 PM

To me it also has a blue cast rather than a simple darkening in the corner. That's why I'm not sure if it's a vignette problem or something that's manifesting itself in such a fashion that it can be mistaken for a vignette problem.

Maybe try various aperture settings as well as macro function and see if it's a lens aberration of some sort.

Paul Joy · November 20th, 2007, 05:22 PM

Quote:

Originally Posted by Craig Seeman

To me it also has a blue cast rather than a simple darkening in the corner

No, I think the blue is coming from my mac screensaver, it is a reflector after all :)

I've attached a small clip.

Steven Thomas · November 20th, 2007, 05:34 PM

So other than the "real" let down with your problem, how was the footage, short of the no light high gain?

Paul Joy · November 20th, 2007, 05:40 PM

Quote:

Originally Posted by Steven Thomas

So other than the "real" let down with your problem, how was the footage, short of the no light high gain?

I haven't really spent long enough with the camera to say, my initial tests were just sitting with the camera experimenting with the camera a 12db gain (it's default high setting) and they looked much brighter than the actual room did, but obviously looked grainy too. It's definitely a lot more sensitive than my A1. I'd to try and get some nice shots but I think it's going to have to go back to the supplier, I'm certainly not waiting for Sony to fix it when it's been like this from delivery.

Craig Seeman · November 20th, 2007, 05:42 PM

I see it starts at about frame 55 or at least that's when I see it encroach. It still doesn't look like a "typical" vignette issue to me since it doesn't seem to happen at other corners.

Do try it against an evenly lit surface when you get the chance.

It's really predominate in the upper left. I don't really notice it at the other corners.

Quote:

Originally Posted by Paul Joy

No, I think the blue is coming from my mac screensaver, it is a reflector after all :)

I've attached a small clip.

November 20th, 2007, 04:44 PM	#1
Paul Joy Major Player Join Date: Mar 2007 Location: Norfolk, UK Posts: 627	Vignette problem I've noticed that my EX1 is suffering from a vignette problem whilst in the mid zoom ranges. Have a look at the top left corner in these screen shots, you can see it's fine at each end of the scale, but throughout the middle ranges it appears. This is happening with the IRIS fully open and in low light if that makes any difference. Can this be solved? Attached Thumbnails __________________ Blog: www.pauljoy.com Company: www.videotrader.co.uk

November 20th, 2007, 04:57 PM	#5
Paul Joy Major Player Join Date: Mar 2007 Location: Norfolk, UK Posts: 627	Yup, well they'll certainly be getting this one back :( __________________ Blog: www.pauljoy.com Company: www.videotrader.co.uk

November 20th, 2007, 05:06 PM	#8
Paul Joy Major Player Join Date: Mar 2007 Location: Norfolk, UK Posts: 627	In order to do a solid colour one I need more light and a larger area, I'll try it tomorrow against a wall. No, there is not a filter attached. __________________ Blog: www.pauljoy.com Company: www.videotrader.co.uk

November 20th, 2007, 04:54 PM	#3
Steven Thomas Trustee Join Date: Sep 2005 Location: Gilbert, AZ Posts: 1,896	What the... That's odd it's in one corner! Also in mid travel? Wow, we need to tests these cam as soon as possible. This should not be happening. Why one corner? I thought I read that in Wilt's article for the pre-ex1..... hmmmm. Sony is going to have A LOT of upset buyers, or not buyers.

November 20th, 2007, 04:57 PM	#4
Craig Seeman Inner Circle Join Date: Feb 2004 Location: Brooklyn, NY, USA Posts: 3,841	Try shooting something with a solid color. It might make it more obvious. Note, Adam's comments mention this specific it wide apertures at 10mm on so this seems like a different issue.

November 20th, 2007, 05:00 PM	#6
Steven Thomas Trustee Join Date: Sep 2005 Location: Gilbert, AZ Posts: 1,896	It's as if something is hanging on the edge of the optical path.

November 20th, 2007, 05:02 PM	#7
Craig Seeman Inner Circle Join Date: Feb 2004 Location: Brooklyn, NY, USA Posts: 3,841	Are you using any kind of clear or UV filter on the front? Maybe you can slow zoom through and see something that might indicate what/why this is happening.

November 20th, 2007, 05:10 PM	#10
Steven Thomas Trustee Join Date: Sep 2005 Location: Gilbert, AZ Posts: 1,896	Paul, I'm sorry to hear this. Looking at the stuff posted on the FTP site I do not see this issue. I would contact my dealer as soon as possible and get the next one before they send it out to someone else. I know these cameras are going to be hard to get. It sounds like Craig is right, this seems like a different issue from Wilt's pre-model.

November 20th, 2007, 05:11 PM	#11
Craig Seeman Inner Circle Join Date: Feb 2004 Location: Brooklyn, NY, USA Posts: 3,841	To me it also has a blue cast rather than a simple darkening in the corner. That's why I'm not sure if it's a vignette problem or something that's manifesting itself in such a fashion that it can be mistaken for a vignette problem. Maybe try various aperture settings as well as macro function and see if it's a lens aberration of some sort.

November 20th, 2007, 05:34 PM	#13
Steven Thomas Trustee Join Date: Sep 2005 Location: Gilbert, AZ Posts: 1,896	So other than the "real" let down with your problem, how was the footage, short of the no light high gain?