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Old 4th of June 2011 (Sat)   #1
Acquiesce
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Default Unexplained Phenomenon.

Guys,
need your help. i have shot a few of the same shots and now noticed that there's a green dark shadow.

these test shot are at H1 ISO and all with the same settings.

I would probably guess its time to service the camera body or change the shutter mechanism. Your thoughts?







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Old 4th of June 2011 (Sat)   #2
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Default Re: Unexplained Phenomenon.

What camera and lens? Check and change the shutter mechanism...most likely
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Old 4th of June 2011 (Sat)   #3
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Default Re: Unexplained Phenomenon.

No problems at all.. It's just the cycling of the lights.

A very common phenomenon.
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Old 4th of June 2011 (Sat)   #4
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Default Re: Unexplained Phenomenon.

Quote:
Originally Posted by yogestee View Post
No problems at all.. It's just the cycling of the lights.

A very common phenomenon.
^ this
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Old 4th of June 2011 (Sat)   #5
Acquiesce
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Default Re: Unexplained Phenomenon.

@jackies35: 5dm2+24-70

yogestee: some of the photos taken has really ugly green banding as if the floor is lighted with a green gel.
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Old 4th of June 2011 (Sat)   #6
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Default Re: Unexplained Phenomenon.

Assuming it's fluorescent lighting, that is what yogestee has said: cycling of the lights.
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Old 4th of June 2011 (Sat)   #7
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Default Re: Unexplained Phenomenon.

Quote:
Originally Posted by Acquiesce View Post
@jackies35: 5dm2+24-70

yogestee: some of the photos taken has really ugly green banding as if the floor is lighted with a green gel.
Florescent lighting. It isn't the floor that's green. It's just coincidentally that the green band is over the bit of floor in your picture.

Decrease shutter speed until it's lower than the cycling rate and it should disappear (I think).
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Old 4th of June 2011 (Sat)   #8
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Default Re: Unexplained Phenomenon.

Was your main light Florescent lights ? if so they cycle at a certain rate and you need a shutter speed to compensate for the lights or shoot RAW and fix in post .

At this time I cant remember the shutter speed that will help

David


Edit : or use your flash to overpower the Florescent lights .
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Last edited by dpds68 : 4th of June 2011 (Sat) at 11:20.
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Old 4th of June 2011 (Sat)   #9
Acquiesce
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Default Re: Unexplained Phenomenon.

Thanks guys. i ran some further tests and found the following results

the shots are mostly on H1 ISO setting and that will 'attract' the recycling of lights effect, well it kinda made me realized that "thats why its called ISO sensitivity"

anyhow thanks for the pointers. really appreciated it! Cheers!
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Old 4th of June 2011 (Sat)   #10
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Default Re: Unexplained Phenomenon.

Quote:
Originally Posted by Acquiesce View Post
Thanks guys. i ran some further tests and found the following results

the shots are mostly on H1 ISO setting and that will 'attract' the recycling of lights effect, well it kinda made me realized that "thats why its called ISO sensitivity"

anyhow thanks for the pointers. really appreciated it! Cheers!
It'll only happen with fluorescent lights
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Old 4th of June 2011 (Sat)   #11
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Default Re: Unexplained Phenomenon.

I work in fluorescent lighting all the time and if you shoot at 1/15, 1/30/ 1/60 and 1/125 you will avoid the frequency cycles but no higher than 1/125 but at even shutter speeds of 1/8, 1/15, 1/30 and 1/125 you should be OK.
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Old 4th of June 2011 (Sat)   #12
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Default Re: Unexplained Phenomenon.

Quote:
Originally Posted by jackies35 View Post
What camera and lens? Check and change the shutter mechanism...most likely
What caused you to tell him that? As others have pointed out, it's caused by the recycling of flourescent lighting.

David
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Old 4th of June 2011 (Sat)   #13
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Default Re: Unexplained Phenomenon.

Quote:
Originally Posted by Woodworker View Post
What caused you to tell him that?
Nikon!
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Old 4th of June 2011 (Sat)   #14
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Default Re: Unexplained Phenomenon.

Quote:
Originally Posted by airfrogusmc View Post
I work in fluorescent lighting all the time and if you shoot at 1/15, 1/30/ 1/60 and 1/125 you will avoid the frequency cycles but no higher than 1/125 but at even shutter speeds of 1/8, 1/15, 1/30 and 1/125 you should be OK.
Yes. If you're in North America, that is, where the power line frequency is 60 Hertz.

Elsewhere it's probably 50 Hz, and the speeds would be 1/100, 1/50, 1/25.

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Old 4th of June 2011 (Sat)   #15
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Default Re: Unexplained Phenomenon.

Quote:
Originally Posted by yogestee View Post
No problems at all.. It's just the cycling of the lights.

A very common phenomenon.
Quote:
Originally Posted by Sdiver2489 View Post
^ this
^that



See this:
http://photography-on-the.net/forum/...d.php?t=308607
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