which lens, what apertures, and are you sure the wall is evenly illuminated?
Herb...
----- Original Message ----- From: "Cory Papenfuss" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Saturday, March 26, 2005 10:43 AM
Subject: Vignetting on -DS 1-stop?
Hey all... I was just looking to take a "white-wall" out-of-focus picture to look for dust on my -DS. When I examined the RAW file (with linear curve, even) it appears that's there's fairly obvious vignetting on the photo. I measured it, and the difference between the linear intensity at the center and the corner is almost magically around 1.4-1.5. It's prevalent on all my lenses (most older), but also on the kit 18-55 that came with it. I even tried it with just a 2x teleconverter, and *no* lens. The latter two weren't quite as pronounced, but there still wasn't an even exposure
Is this a normal and acceptable amount of falloff? I guess it's just illustrating how sensitive the CCD is to the *angle* the light is coming in from, no?
