Higher ISO = Bluer Sky?

<p>I heard this quick blurb on a LightenUpAndShoot.com video about bumping up the ISO can get more blue out of the sky. This wasn't a 30 minute dissertation on the subject, just a brief comment in passing. </p>

<p>Can anyone speak to this? He seemed to state that around sunset bumping the ISO higher might tend to bring out more blue in the sky. I've heard another photographer talk about shooting right at sunset - I mean at the moment - and changing a setting and the sky goes blue. Seems to be Bryan Peterson on the west coast in this video<br>

<a href="http://www.youtube.com/user/ppsop2009#p/u/21/OcpwOTSNFI8">http://www.youtube.com/user/ppsop2009#p/u/21/OcpwOTSNFI8</a></p>

<p>Anyone have experience with this?</p>

<p>Bumping ISO allows for shorter exposure times (aperture held constant) or smaller aperture (exposure time held constant.</p>

<p>In either case, the exposure remains exactly the same. Why blue should become "bluer" (whatever that may means) is beyond the physics of photography: just a simple, maybe even silly myth.</p>

<p>Lenses used at wider apertures generally lose contrast. At a higher ISO, you're likely shooting more stopped down, and thus getting better contrast out of the lens.</p>

<p>Perhaps they mean that you can up the ISO and keep shooting as it gets darker, since the later in the evening you go the cooler/bluer the light will get.</p>

<p>As to that video you linked to, I don't think I could take advice from anyone with hair like that. :-) </p>

<p>Perhaps I'm confused, but Bryan Peterson doesn't say anything about an ISO/blue connection. In fact, in that video he shot the scene at ISO 200 (f/11 for 10 seconds).</p>

<p>I think Peterson's "trick" is his filter. It's a magenta filter which would boost blue? Correct? I understand bumping up ISO to get a shorter exposure. It was the other blurb I'm trying to find that is interesting about blue. I wouldn't change Peterson's hair for anything! And he must spend every waking moment in the sun. </p>

<p>one suggestion though for blue sky, try manually set tungsten in color correct setting I might be wrong but that what I hear from somewhere </p>

<p>I didn't see anything in that video that suggested higher ISOs. In fact he shot both shots at ISO 200.</p>

<p>Chin, I've heard that. I know you can set the WB to florescent and make just about everything blue. That's neat trick I'll try. </p>

<p>Peterson didn't say anything about a high ISO making things blue it was the LightenUpAndShoot guy. And I can't find it. It was on a Lens flare tutorial. Ya, crazy. But we all gained something I hope. </p>

<p>One way to get bluer skies is to underexpose a bit. I suspect when people say things like "Higher ISO gives you a bluer sky" what they really mean (though they don't realize it) is that their camera happens to auto-expose a little lower at higher ISOs or at smaller apertures.</p>

<p>I wouldn't set a digital camera to tungsten white balance in daylight; the picture will just look weird. What might help a little (which sometimes may be enough) is to use some lightly-tinted filter that cuts blue just a bit, such as a UV or skylight filter.</p>

<p>Noreen and Dan are right. Nothing in the video said anything about ISO or making the sky bluer. The FLW filter takes the green cast out of fluorescent lights in buildings and can make sunsets pop. I've carried one for a while now...read it in a Joe McNally book.</p>

<p>Why would you want a blue sky at sunset? It will look unnatural. To get deep blues during the day, underexpose.</p>

<p>I shoot raw and then play with color and wb in post.</p>

<p> </p>