what causes this "reflection?" ?
Jan 2, 2012 20:03:08 #
Hi,
I'm somewhat new to using the manual mode on my Canon T1i, but I know I'll never go back to auto mode again.
Anyway, I've been noticing on a few photos I've taken indoors with just natural lighting ( no flash ) I occasionally get ghosted reversed images or "reflections" usually from neon signs. ( The the attached photo ) What causes this?
Like I said I'm using manual mode, and in this case I believe I was using a 28mm f1.8 lens, probably set around f2.?-f3.?, probalby ISO 800 or 1600, shutter probalby around 1/60 ( these are my typical starting points for lighting as in this picture)
Sometimes the reflection looks pretty cool, but then sometimes it may be across someones face or elsewhere that just ruins the shot...and as I said, its aleays from a neon light, like a bar sign....
I'm somewhat new to using the manual mode on my Canon T1i, but I know I'll never go back to auto mode again.
Anyway, I've been noticing on a few photos I've taken indoors with just natural lighting ( no flash ) I occasionally get ghosted reversed images or "reflections" usually from neon signs. ( The the attached photo ) What causes this?
Like I said I'm using manual mode, and in this case I believe I was using a 28mm f1.8 lens, probably set around f2.?-f3.?, probalby ISO 800 or 1600, shutter probalby around 1/60 ( these are my typical starting points for lighting as in this picture)
Sometimes the reflection looks pretty cool, but then sometimes it may be across someones face or elsewhere that just ruins the shot...and as I said, its aleays from a neon light, like a bar sign....
see the green "reflection" on his back
Jan 2, 2012 20:05:07 #
Jan 2, 2012 21:08:36 #
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.
Jan 3, 2012 00:11:20 #
CaptainC is the leader of the lens hood parade! And I'm right behind him!
Don't EVEN bother to trip the shutter without a lens hood firmly attached to your lens. Trouble is...from about 35mm lenses on down (20mm, 18mm, etc.) it's so easy for a lens hood to cause vignetting.
I often us a compendium type lens hood when things get critical, it can be a pain in the rear, but well worth it.
Don't EVEN bother to trip the shutter without a lens hood firmly attached to your lens. Trouble is...from about 35mm lenses on down (20mm, 18mm, etc.) it's so easy for a lens hood to cause vignetting.
I often us a compendium type lens hood when things get critical, it can be a pain in the rear, but well worth it.
Jan 3, 2012 00:42:55 #
Jan 3, 2012 00:44:22 #
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!
Jan 3, 2012 00:49:44 #
so whats a good suggestion for a 28mm f1.8 canon lens for this T1i? I'm assuming one thats not too long, or narrow, because of the wide lens.. am I right, and are hoods rated by size or is it a hit and miss thing?
Jan 3, 2012 05:41:50 #
Jan 3, 2012 07:01:42 #
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.
Jan 3, 2012 07:52:14 #
Jan 3, 2012 07:54:05 #
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.
That's what I was thinking....
Jan 3, 2012 08:06:02 #
photocat
Loc: Atlanta, Ga
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.
Jan 3, 2012 08:06:03 #
I've had similar reflections doing moon shots with a long lens and long exposure. I've been told the reflection is light bouncing between elements in the lens. I usually got a green moon slightly offset from the over-exposed moon, and when I went REALLY long on the exposure, got a second magenta reflection offset again from the green reflection. (Nikon D200, Nikkor 120-400 zoom lens)
I didn't think to take off the UV filter to see if that changed things.... gonna try that next full moon!
I didn't think to take off the UV filter to see if that changed things.... gonna try that next full moon!
Jan 3, 2012 08:46:59 #
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.
I'm not positive about anything. This is also a good possibility. I'd try one thing at a time to make sure.
Zerbphlatz wrote:
I've had similar reflections doing moon shots with... (show quote)
The green and magenta sounds like chromatic aberration (CA).
Jan 3, 2012 09:38:08 #
Lens hoods are designed for each lens. Has to do with the field of view.
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