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Forums Lobby MASTER YOUR NIKON CAMERA Nikon D60/D50/D40 (Public) topic #19375
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Subject: "D50: Digital Green Dot on photo" Previous topic | Next topic
brandon_w   Madison, US  Registered since 23rd Apr 2007 Sat 30-Jun-07 07:05 PM
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"D50: Digital Green Dot on photo"



Has anyone else ever had this happen:

http://www.coffeestain.org/bwisch/albums/userpics/10001/DSC_0195-1.JPG

Towards the lower right hand corner there is a green dot. I left the image kind of big so it is noticable. This happened in two out of about 200 pictures I took last night while doing some sunset photo taking.

-Brandon

  

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Fish_Face   UK  Registered since 29th Jun 2007 Sat 30-Jun-07 07:16 PM
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#1. "RE: D50: Digital Green Dot on photo"
In response to Reply # 0



I'm no expert but it looks very much like ghosting, caused by the bright light of the sun reflecting inside the lens. If you have a protective filter on the front of the lens, it may well be better, if not gone, when that's removed.
My protective filter is already horrible and smeary, and in challenging lighting it doesn't seem to introduce flare, but makes existing flare pretty nasty.

--
D40, 18-55

  

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brandon_w   Madison, US  Registered since 23rd Apr 2007 Sat 30-Jun-07 09:26 PM
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#2. "RE: D50: Digital Green Dot on photo"
In response to Reply # 1



That makes sense, I've never seen the flare manifest itself in that way but it does make sense. I'll take my filter off next time.

That shot is actually of the moon last night, took it after the sun was down, not much of a shot.

Thanks,
Brandon

  

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alembicbassman   The North, UK  Registered since 30th Oct 2004 Sun 01-Jul-07 09:17 AM
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#3. "RE: D50: Digital Green Dot on photo"
In response to Reply # 2



Light also reflects back off the low pass filter onto the rear lens element and is then re-reflected onto the sensor where it is recorded as a green spot.

Nikon is improving coatings on rear elements to reduce this, but only on the more expensive lenses.

  

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MotoMannequin Moderator Awarded for his extraordinary skills in landscape and wildlife photography   Livermore, CA, US  Nikonian since 11th Jan 2006 Sun 01-Jul-07 04:15 PM
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#4. "RE: D50: Digital Green Dot on photo"
In response to Reply # 0



That's one of the classic side-effects of light bouncing off the sensor, against some lens element (usually a "protective" UV filter, lenses themselves are pretty well designed to not do this). The tell-tale sign is your green ghost appearing 180º around center from a bright light source.

Larry - a Bay Area Nikonian
My Nikonians gallery

Larry - a Bay Area Nikonian
My Nikonians gallery

www.tempered-light.com

  

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Forums Lobby MASTER YOUR NIKON CAMERA Nikon D60/D50/D40 (Public) topic #19375 Previous topic | Next topic