what causes this "reflection?" ?
Jan 3, 2012 09:40:47 #
I just went and looked up CA, and what I was seeing doesn't quite sound like that. Further searching identifies it as "Lens Flare". I was getting pretty much complete images of the moon in different colors (non-overlapping images). Here's two online examples of what I was seeing:
http://en.wikipedia.org/wiki/File:%27Perception_of_Christ_Ascending_to_Heaven%27_Dome_of_the_Rotunda_of_the_church_of_the_Holy_Sepulchre_Jerusalem_Victor_Grigas_2011_-1-19.jpg
http://en.wikipedia.org/wiki/File:CCTV_Lens_flare.jpg
http://en.wikipedia.org/wiki/File:%27Perception_of_Christ_Ascending_to_Heaven%27_Dome_of_the_Rotunda_of_the_church_of_the_Holy_Sepulchre_Jerusalem_Victor_Grigas_2011_-1-19.jpg
http://en.wikipedia.org/wiki/File:CCTV_Lens_flare.jpg
Jan 3, 2012 10:00:23 #
senad55verizon.net
Loc: Milford, NJ
These are the kinds of ghost images that can result from internal reflections within the lens. It's exactly what antireflective surface coatings of various kinds, like Nikon's "Super multi-coating", are designed to prevent.
A lens hood is a really good idea but won't help with this problem, which crops up around high luminance areas in an otherwise low luminance background. The dark background is what allows them to appear in the image.
These things are present but are not so obvious in other pix with smaller luminance gradients, where they just degrade the quality of the image in more subtle ways...
Solution: a better (read more expensive) lens with higher quality internal surface coatings.
A lens hood is a really good idea but won't help with this problem, which crops up around high luminance areas in an otherwise low luminance background. The dark background is what allows them to appear in the image.
These things are present but are not so obvious in other pix with smaller luminance gradients, where they just degrade the quality of the image in more subtle ways...
Solution: a better (read more expensive) lens with higher quality internal surface coatings.
Jan 3, 2012 10:24:15 #
docrob
Loc: Durango, Colorado
cowboybobs wrote:
Hi, br I'm somewhat new to using the manual mode ... (show quote)
Lots of people say well use a lens hood or a filter. Me, I just say pay attention and use your feet. Can't say for sure but sorta doubt that a lens hood is your answer or a filter (unless you want to change the color of the reflection.......best answer look and move
Jan 3, 2012 11:00:17 #
cowboybobs wrote:
Ahh.. no lens hood.. didnt get one with the lens....I'll have to get me one..thanks!
CaptainC wrote:
Sure looks like a reflection from one of those neon signs. Like snowbear asked, it could be a reflection on a filter - especially if it is not multi-coated.
But it could be right off the front lens element, filter or not.
Do you use the lens hood? IMO, that should always be on the lens - it will keep light sources off to the side from doing this.
But it could be right off the front lens element, filter or not.
Do you use the lens hood? IMO, that should always be on the lens - it will keep light sources off to the side from doing this.
Ahh.. no lens hood.. didnt get one with the lens....I'll have to get me one..thanks!
Two nights ago I took a shot of the moon and got that same type of reflection. Yep, had a UV filter on. Removed it, reflection gone, even when I drastically overexposed the moon.
It appears that you might have up to three reflections, one to the far left of center at 9 o'clock and one that's turned a sign green near the center of the shot.
The one one you ask about, on the guy's back, is rectangular and reflects a point source at its right edge. I'll bet that's from either the window or the monitor (TV or ??). The others appear to be from neon signs. All appear to be reflections off a UV filter.
A lens hood won't help with light sources in the lens' field of view, like the window. You've got to minimize glass surfaces and keep them clean, for that. The lens hood will save you from all of the light sources that are not directly in your lens' field of view, and there always seem to be some that we aren't paying attention to because we are focused on the FOV.
Jan 3, 2012 11:11:40 #
docrob
Loc: Durango, Colorado
always kinda interesting that the simple answers get lost in the mass of confusion of more complications......just sayin
Jan 3, 2012 11:21:58 #
photocat wrote:
Check the canon site for specs on which lens hood goes with that camera. The wrong one can create issues of another kind.
I also vote for lens flare, altho square is strange. Even light coming from the viewfinder back would not be so even, and that usually occurs with long exposures.
I also vote for lens flare, altho square is strange. Even light coming from the viewfinder back would not be so even, and that usually occurs with long exposures.
No, the lens hood is peculiar to the individual lens, not to the camera body.
By the time you get down to 28mm and below the lens hood is going to be quite narrow to avoid vignetting, hence less effective as a hood.
If I spot a problem light in the viewfinder, I try to get someone to hold a piece of blocking paper or something in front of it.
In this case, however, I agree it is a bogey coming in through the viewfinder. Easy to determine. Hold your thumb over the view finder to see if that solves the problem.
An interesting photo.
Good luck!
Jan 3, 2012 12:50:39 #
digicamking
Loc: Raleigh, NC
cowboybobs wrote:
Hi, br I'm somewhat new to using the manual mode ... (show quote)
I had this happen to me about a year ago and it turned out that it was light going thru the viewfinder. I covered the viewfinder and never had the problem again.
Jan 3, 2012 15:28:23 #
frasher101
Loc: Houndsfield N.Y.
Looks like his right arm is swung out and the green is coming from his arm pit. The reflection off the table top from the green neon light on the left side. It is not on his back.
Jan 3, 2012 15:35:29 #
frasher101
Loc: Houndsfield N.Y.
He could be playing a table top pin ball game like GOLF
and the green is the fairway
and the green is the fairway
Jan 3, 2012 17:54:23 #
cowboybobs wrote:
yes, a UV filter
It is the cheap filter...take it off...I took pics at a vigil and had these enomolies. They were confirmed by checking the back of my camera and seeing them again when i was shooting the Christmas parade!!!
Jan 3, 2012 19:46:22 #
eugene666
Loc: Westchester
To me it looks like he is getting up from the table in front of him, not golf. If you look to the wall/doorway on the left edge of the picture you can see a similar (maybe same) green light. I can't say how it got there, but would say it is definitely a reflection from somewhere off to the left of the scene.
Jan 3, 2012 22:18:10 #
Do neon lights pulse like fluorescent lights? If they do, could this be part of the problem? Just a thought.
Jan 4, 2012 14:15:19 #
I'm going to go with the lights in the bar as this color shows up in the upper left corner and some on the bottom rail of the chalk board over head. Guessing there are so many different types of light sources your light meter had a hard time making the correct white balance.
Jan 4, 2012 19:10:32 #
RTR wrote:
Playing devil's advocate here. Are you guys sure that this is a reflection coming in through the lens? It looks really rectangular and has sharp edges (compared to reflections in my photos :) ). My Nikon D5100 came with a cover for the viewfinder and the manual says to use it to block light from getting in the shot when you are not taking photos with the camera up to your eye.
When the exposure is made, the mirror is up and no light from the viewfinder will affect the image. The reason for blocking the viewfinder is to keep any light entering the camera through that area from affecting the metering.
So I think digicamking's solution may have seemed like the answer, I do not see how. When the mirror is up, the only light path to the sensor is from the lens. That is why the viewfinder goes black at the moment of exposure.
Jan 4, 2012 20:02:36 #
CaptainC wrote:
quote=RTR Playing devil's advocate here. Are you ... (show quote)
That makes sense! I am learning.
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