![]() Then I found a nice thread on flickr from some real geniuses ( I would link to it, but I don't know the rules on links to other sites.is that okay?). To fix it, at first I tried simply taking my macro photos with a black background, and that helped, but not completely. There were some slightly too shiny surfaces inside, and from doing extensive research I found that these surfaces can cause non image forming light to bounce around in the tube and do this.even though there is no light leaks. It was the macro extension tube I was using. It wasn't light off the sensor, well, not exactly. A quick update for you, and others in this thread (by the way, is there a way I can update my thread where everyone who posted will get a notification?):Īnyway, I found out the culprit. It's been my experience that this only shows up under certain conditions and you seem to have found one. It wasn't a problem in film days so most lenses from that era don't have that. When you see that a lens was "designed for digital photography", many times that means the rear elements of the lens were coated to help prevent flare from the sensor. I'm going to vote for light reflecting off the sensor, too. In post a localized loss of contrast can usually be compensated for, but sometimes you get a fairly hard aperture-shaped hot spot that is blue or purple with definitive edges - a bit more challenging. Play around with it and different angles and apertures to see when it gets better/worse. ![]() Very often background diffuse light is a bigger problem than direct light (photographing something indoors with a bright window behind it, even if the light source isn't in the shot), but it just depends. The angle of the light in the scene can also make a difference. Also look for light leaks around the mounts when using any weird set-ups. Also crappy extension tubes that might not be as light-absorbing along the edges as they could be (or anything scratched in the light path that has become silvery/shiny). (And an old lens might have loss of interior paint, etc). Using a lens normally you have to watch out for older lenses with flat rear elements and there are a few with aperture blades that cause reflections. Any sort of reversed lens will be somewhat unpredictable - new or old could cause a problem - depends on lens shape and coatings.
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