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01/18/2004 11:46:30 AM · #1 |
| I heard somewhere that the higher the aperature, 8.0, the highest on my camera, produces less noise then an aperature of 3.5 Is this true? |
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01/18/2004 11:48:08 AM · #2 |
I don't think the aperture setting is related to noise levels. I suppose it could be if you used a smaller aperture to underexpose your photo tho.
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01/18/2004 11:50:47 AM · #3 |
| Or maybe a wide aperture is associated with low light/dark photography where noise levels will be higher? |
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01/18/2004 12:00:30 PM · #4 |
For equally-exposed shots in normal situations, you should see little difference, though there IS a difference. An f/8 aperture lets in 4x less light than, say, f/4. The exposure thus needs to be 4x longer, and this will raise the amount of noise in the resulting photo. that said, at shutter speeds normally used for hand-held shots, this effect should be minimal with most cameras. For longer expossures (tripod in low light, exposures of multiple seconds), this effect can certainly be a problem.
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01/18/2004 02:24:16 PM · #5 |
Aperture isn't directly related to noise, only indirectly via the ISO and shutter speed required for a proper exposure. And the indirect adjustments for the larger aperture value (smaller physical aperture) will result in more noise, not less.
Perhaps what you heard is that the larger aperture value results in less blurriness. This is true because the larger value gives a larger depth of field, so more objects will generally appear in focus. |
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01/18/2004 03:06:20 PM · #6 |
An interesting semantic puzzle. When I hear the phrase "large aperature", I always intrepret that to mean a wider or lower f stop (lower number). "Small aperture" to me means a narrow or higher f stop (higher number). I almost lost what dr rick was actually saying. Might be regional dialect, but I was confused for a minute.
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I would lean in the camp of Setzler & dr rick. I think their observations have some merit. To be sure other variables might come into it.
Message edited by author 2004-01-18 15:33:46. |
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01/18/2004 04:36:11 PM · #7 |
think about it this way... you take several exposures of the same scene in late afternoon/evenig with fading light. You are in "aperture preferred" mode, so your camera compensates for the fading light by increasing exposure time (ISO is constant).
As the light fades and exposure time increases, the image will get noisier. Taking this to the extreme, if you continue to shoot well past dusk, the exposure will be very long (minutes) and the noise may be quite high.
This example is the same as changing the aperture; the lower the rate at which light gets to the sensor, the less signal-to-noise ratio you will have.
ISO does not have to change in order to observe this effect.
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