Have recently been experimenting with night time photography with long exposures (around 30 second shutter speed). Have found if i have the aperature set to F2, the photograph produced is vibrant and colourful! However, if the aperature is set to F16, the image is darker and red! I understand that F16 has a smaller iris/aperture, so less light gets to the sensor, making it darker, but why the redness? Is this something to do with light bending like redshift??????
2007-10-23 01:57:56 · 4 answers · asked by Anonymous in Arts & Humanities ➔ Visual Arts ➔ Photography
at F2.8 you are letting in 16 times more light then at F16, so hence the manmade amber light is being picked up alot more at F2.8 than at F16
the light is "spilling" onto the black (or where it should be black)..........
what iso are you using??? without that no more geussing from me....
i find 100iso F8 - F16 handles most 30sec exposures around manmade ambient light/ night shots - without a lot of red/orange spill
EDIT: i agree with Zanas sypnosis also, mostly i use transparencies for long exposures as i prefer reproprosity failure and the characteristics of transparency in long exposures (no noise etc)
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2007-10-23 02:12:43 · answer #1 · answered by Antoni 7 · 2⤊ 0⤋
It could be what we call 'an artifact' produced by the sensor. What could have happened is under low light the sensor, which may be more sensitive to red light, will record red better than the other colours, resulting in a scene which is mostly red pixels. When there is adequate exposure/light, all the colours are registered and, when mixed, produce normal colour.
2007-10-23 02:16:16 · answer #2 · answered by Anonymous · 1⤊ 0⤋
The redness in night-time photographs is caused by the colour temperature of any light source. Aperture really shouldn't affect the colour, stopping down just makes the exposure longer, resulting in deeper depth of field. To rid yourself of the red problem set the white balance on your camera to 'night time' (or similar).
2007-10-23 23:00:15 · answer #3 · answered by tim h 4 · 0⤊ 0⤋
You have some good answers.
I've used these settings for successful night photography:
ISO 100
f5.6 @ 15 seconds
f8 @ 30 seconds
f11 @ 60 seconds
ISO 200
f5.6 @ 8 seconds
f8 @ 15 seconds
f11 @ 30 seconds
Taken from my FotoSharp (fotosharp.com) Day & Night Exposure Guide
I have 2 examples at flickr.com/photos/8184104@N06. Both were at ISO 200, f8 for 15 seconds. In one I zoomed in from 70mm to 210mm.
2007-10-23 04:49:12 · answer #4 · answered by EDWIN 7 · 1⤊ 0⤋