Lens Question at DVinfo.net

John Steele · October 8th, 2003, 04:36 PM

Guys,

Just noticed something today when using my Sony DSR-390. I was zooming into an object on a white wall and during the zoom the outside edges of the image started to get darker as the zoom progressed. It also happens on my vx2000 so I figured it's a normal side effect of a zoom lens. Is this the case?

John.

Dylan Couper · October 8th, 2003, 05:18 PM

Yep, it's normal.
It's called tunneling, or keyholing, depending on who you ask.
Use the search feature at the top right of the screen with one of those two keywords, and you will find several threads talking about this effect.

October 8th, 2003, 04:36 PM	#1
John Steele Major Player Join Date: Jul 2002 Location: Scotland, UK Posts: 216	Lens Question Guys, Just noticed something today when using my Sony DSR-390. I was zooming into an object on a white wall and during the zoom the outside edges of the image started to get darker as the zoom progressed. It also happens on my vx2000 so I figured it's a normal side effect of a zoom lens. Is this the case? John.

October 8th, 2003, 05:18 PM	#2
Dylan Couper Wrangler Join Date: Jun 2002 Location: Vancouver, British Columbia Posts: 8,314	Yep, it's normal. It's called tunneling, or keyholing, depending on who you ask. Use the search feature at the top right of the screen with one of those two keywords, and you will find several threads talking about this effect. __________________ Need to rent camera gear in Vancouver BC? Check me out at camerarentalsvancouver.com