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Thread started 04 Jun 2011 (Saturday) 10:56
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Unexplained Phenomenon.

 
Acquiesce
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Jun 04, 2011 10:56 |  #1

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?

IMAGE: http://farm3.static.flickr.com/2298/5796444323_ed0b5e0632_z.jpg

IMAGE: http://farm3.static.flickr.com/2607/5796447663_a0ecf264c0_z.jpg

IMAGE: http://farm3.static.flickr.com/2754/5796450179_1a3a7fb0f7.jpg



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jackies35
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Jun 04, 2011 11:02 |  #2

What camera and lens? Check and change the shutter mechanism...most likely


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yogestee
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Jun 04, 2011 11:05 as a reply to jackies35's post |  #3

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

A very common phenomenon.


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Sdiver2489
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Jun 04, 2011 11:10 |  #4

yogestee wrote in post #12534984external link
No problems at all.. It's just the cycling of the lights.

A very common phenomenon.

^ this


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Acquiesce
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Jun 04, 2011 11:12 as a reply to yogestee's post |  #5

@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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cjd
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Jun 04, 2011 11:15 |  #6

Assuming it's fluorescent lighting, that is what yogestee has said: cycling of the lights.


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MARK1992
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Jun 04, 2011 11:16 |  #7

Acquiesce wrote in post #12535009external link
@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. :p

Decrease shutter speed until it's lower than the cycling rate and it should disappear (I think).




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dpds68
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Jun 04, 2011 11:17 |  #8

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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Acquiesce
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Jun 04, 2011 11:27 as a reply to dpds68's post |  #9

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" :o

anyhow thanks for the pointers. really appreciated it! Cheers!




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Sdiver2489
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Jun 04, 2011 11:40 |  #10

Acquiesce wrote in post #12535064external link
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" :o

anyhow thanks for the pointers. really appreciated it! Cheers!

It'll only happen with fluorescent lights


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airfrogusmc
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Jun 04, 2011 11:43 as a reply to Sdiver2489's post |  #11

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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Woodworker
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Jun 04, 2011 13:31 |  #12

jackies35 wrote in post #12534964external link
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


David

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Hermeto
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Jun 04, 2011 13:44 |  #13
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Woodworker wrote in post #12535600external link
What caused you to tell him that?

Nikon! ;)


What we see depends mainly on what we look for.

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number ­ six
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Jun 04, 2011 15:17 |  #14

airfrogusmc wrote in post #12535153external link
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.

-js


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S.Horton
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Jun 04, 2011 15:26 |  #15

yogestee wrote in post #12534984external link
No problems at all.. It's just the cycling of the lights.

A very common phenomenon.

Sdiver2489 wrote in post #12535000external link
^ this

^that

;)

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


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Unexplained Phenomenon.
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