4th of July Pictures - Mirrored Image

[MentalNoiz]

Let me start off by saying I am in the beginner category of photography .

With that said, a good friend and I went out on the fourth for a first attempt at capturing fireworks . Some images turned out well, but the following images below have us stumped . What would be causing the mirrored image ?

It did not show up in all of the shots we took, approximately fifteen percent I'd gander .

The pictures were all taken on a tripod with a 20D & 70-200 f/2.8 L NON-IS .

Some stats from the Extended Info :

Shutter Speed - 2 sec.
Lens Aperature - F/2.8
Focal Length - 70mm
F-Number - F/2.8
Exposure Time - 2 sec.
ISO Speed - ISO-400
Metering Mode - Pattern
Exposure Program - Shutter Priority
Exposure Comepensation - +0.3 step

Any advice or information would be greatly appreciated, thanks .

EDIT: The second image has a shutter speed of 4 sec with everything else being the same .

[Pekka]

Did you have any filters on that lens?

[the.digital.guy]

Post a "Good" Photo and your camera settings.
I need to do a comparison............there could be many reasons.

Most of the Fireworks that I have shot in the past have been with:
Canon 70-200mm f/2.8 IS w/20D
Most of my settings were:

Bulb setting
70mm(lens focus to infinity)MF
ISO 100
f/8-f/11
1-2 seconds(mostly 1 second)

I used a tripod and a remote

[Hellashot]

Looks like filter flare, plus you should have probably used a little higher f - of at least 4 - those look blown out.

[MentalNoiz]

Thank you all for the responses .

Pekka & Hellashot : I did forget to mention we had a Canon 77mm Haze UV-1 Glass Filter (L-39 Sharp Cut) on while shooting .

the.digital.guy : After going through a lot of the pictures we took, quite a few of the better ones were at a higher F number . We still have a lot to learn it appears . Its very enjoyable though .

Here are a couple of the better pictures along w/ the exif info :

EXIF - fire1.jpg (http://www.rabungap.com/images/Misc/fire1.txt) (F3.2)

http://www.rabungap.com/images/Misc/fire1.JPG

EXIF - fire2.JPG (http://www.rabungap.com/images/Misc/fire2.txt) (F10.0)

http://www.rabungap.com/images/Misc/fire2.JPG

[mdenigris]

Those are reflections caused by a flood of light inside the lens. Good fireworks exposures are ISO 200, f8-f16, and 2-4 seconds. You're at f2.8 ISO 400 -- there's way too much light for that.