What causes these phantom lights?

[Doug Pardee]

Originally Posted by overseasJJ

I guess these are coming form the lens and can't be avoided? Maybe something to do with it being a $99 lens?

That'd be my guess. Those are still 180-degree "ghosts", so they're almost certainly the result of re-reflection from a flat surface. As I mentioned, the back side of the front element is flat on just about all "popularly-priced" lenses, and with an inexpensive lens it's possible the manufacturer scrimped on the coatings.

[Claudia5573]

I just came across this thread and found it very helpful as I had the same issues with the ghosting or flare and had no idea why I was getting it. I am new to photography this past year and just got my 50mm this past month so have tried it out on a good amount of Christmas lights. The UV filter I have been using is one of the VERY affordable ones. If I am understanding correctly some of you are not UV filter advocates. Is this in general or more specifically on the 50mm. Also I see noted that if using a UV filter it should be mulit-coated. Anything more specific to look for, type or number of coatings?
As always, I appreciate all your responses and time given.

[Doug Pardee]

Originally Posted by Claudia5573

If I am understanding correctly some of you are not UV filter advocates. Is this in general or more specifically on the 50mm.

I'm an advocate of "no UV filters" on digital cameras. UV filters don't improve your image, they can only degrade it. The claimed protective nature of UV filters is nothing more than claims and anecdotes. The front element of modern lenses is designed to be protective, and doesn't need further protection. A solid-type lens hood will provide protection against most hazards while improving image quality, and when the lens is not in use, a lens cap is superior to a UV filter for providing protection.

Originally Posted by Claudia5573

Also I see noted that if using a UV filter it should be mulit-coated. Anything more specific to look for, type or number of coatings?

Although there are different variations of "multi-coated", it's difficult to get any sense of one being better than another. Certain varieties tend to be easier to clean without leaving streaks, but I don't know which ones those are.

[spazoid1965]

Originally Posted by overseasJJ

....I guess these are coming form the lens and can't be avoided? Maybe something to do with it being a $99 lens? Interestingly, when I rotated to landscape, I didn't see any ghosting.

It could still be reflection, Caused by the lens elements.