Green stripe

[Glen]

Hi All,
I took a shot on the weekend in front of a mirror with flash. I got a green stripe, almost in line with the flash, vertically down the image. Does anyone know if this is a ccd quirk (most likely), something unusual about flash in front of mirror or something else?

Thanks for any clues, just trying to avoid this again.

Glen

[Flyer]

Hi Glen,

See here:
http://forums.dpreview.com/forums/read. ... ge=9676179

and here (6th picture down):

http://forums.dpreview.com/forums/read. ... ge=9089812


Hope this helps.

Arek

[Glen]

Thanks Flyer, seems like I had blooming which the sensor on the D70 is sensitive to. Caused by a bright light source on the edge of the sensor.

[Onyx]

It's not quite blooming. When it's near the edge, as Ken Rockwell explains:

http://www.kenrockwell.com/nikon/d70perf.htm#blooming

"Guess what: this isn't blooming. Look carefully and you'll notice that the disk of the sun is outside the top of the image. The dozens of similar images with the sun actually in the photo as I intended and the horizon straight were fine. What happened is that the sun leaked through the black paint on the edge of the CCD. CCDs need to see black along the edges outside the image so they can calibrate the rest of the active image to what black should look like. If you are stupid enough to focus the direct light of the sun on the very edge of the calibration area of the CCD with an ultra-wide angle lens then the CCD presumes that the elevated brightness of the direct sun sneaking under the black paint should be black. The camera's circuits then corrected this elevated level back to black and at the same time corrected the rest of the image which left the darkened band. Moral? Compose correctly and you'll be fine."

[Glen]

Spot on Onyx, not sure what else to call it, but that is what it was. It happened because the mirror in the background reflected the flash and hit the edge. Here is the photo and you can see how it happened.