Help. Whats in the sky of this picture

Nikon AF-S DX NIKKOR 18-200mm f/3.5-5.6G ED VR II

07/23/2009 03:35:37 AM · #1

Can anyone tell me whats causing the artifacting to the right of the fireworks in this picture ? I beleive its from a city light near by where i was shooting or it could be just my exposure time or ISO. Any one have any ideas what could be causing this. It should up in almost all my images at the end of the night. Im shooting with a 40D and a 70-200 IS 2.8L.

Any help would be great as im going to go to this spot again and would like to know what i can do to prevent this. It didn't show up in this shot earlier on and less zoomed in.

Thank you

Message edited by author 2009-07-23 03:41:01.

dacrazyrn

Nikon D300

07/23/2009 03:48:22 AM · #2

which way was the wind blowing? It looks like it might be the "smoke" from the firecrackers explosion drifting off and reflecting light (????). All the shots you see this in...are they in the same identical spot? Can you stack them and they would be in the exact same place? or if you "flip" through them are they moving?

Message edited by author 2009-07-23 03:49:04.

paynekj

Pentax K10D

Pentax DA 18-55mm f/3.5-5.6 AF

07/23/2009 03:48:31 AM · #3

If you look carefully in your second shot you'll see the same artefacts, just higher in the frame. As this mirrors the position of the city lights in the frame, I'd say that's your problem - internal reflections in the lens/camera.

Intelli

Nikon D300

Nikon AF-S DX Zoom-Nikkor 17-55mm f/2.8G IF-ED

07/23/2009 04:31:36 AM · #4

I would say that is smoke..

david1707

Nikon D90

Tamron AF 18-200mm f/3.5-6.3 XR Di II for Nikon

07/23/2009 07:43:35 AM · #5

Are you using a filter? I have found that if my UV filter is a bit dirty it can cause this. Sometimes even if it is clean I'll get reflections from it of the lenses glass. Try to duplicate this with another light source then remove the filter and see if it goes away.

07/23/2009 11:47:49 AM · #6

Originally posted by paynekj:

There pretty much in the same spot but do move a bit

Sony FE 200-600mm f/5.6-6.3 G OSS

07/23/2009 12:02:17 PM · #7

Originally posted by david1707:

David you could be on to something . Ill def have to play with this some more to figure out a defintive answer. My first thoughts were OMG I SCRATCHED my 70-200. I must have tooken 20 shots when i got home to make sure my baby was ok. LOL :)

vawendy

Sony Alpha 1

07/23/2009 12:05:26 PM · #8

Originally posted by benfica:

Originally posted by david1707:
Are you using a filter? I have found that if my UV filter is a bit dirty it can cause this. Sometimes even if it is clean I'll get reflections from it of the lenses glass. Try to duplicate this with another light source then remove the filter and see if it goes away.

David you could be on to something . Ill def have to play with this some more to figure out a defintive answer. My first thoughts were OMG I SCRATCHED my 70-200. I must have tooken 20 shots when i got home to make sure my baby was ok. LOL :)

I've gotten reflections off of my filter many times -- when shooting a candle, the sun, etc. Never had it before, don't know why it's happening, but I just remove the filter and there's no problem. (even with a clean filter, it happens...)

07/23/2009 12:07:09 PM · #9

Bingo !!! i think i may have found my answer.

Excellent example of UV filter flare on and off

Looks like i have to stop down the apeture to stop the light from bouncing back. And remove the UV filter

Message edited by author 2009-07-23 15:36:42.

MelonMusketeer

Nikon D7000

Nikon MF 50mm f/1.4

07/23/2009 12:22:38 PM · #10

Here's a better example, and yes, filters can cause reflections. Light bounces back and forth between the flat UV filter over the sensor, and the back of any filter on the front of the lens. With some it's worse, and others, not so bad. I don't know if changing aperture would make any difference, as you would just expose longer, and get about the same result. Some of what you were seeing in your shots may be smoke in the air. It does show up like that at fireworks show shots.
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