michaelvandijk
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Posts: 16
Joined: Fri Jul 05, 2013 8:03 pm

Does Temperature Affect Photo Sharpness?

Sat Aug 24, 2013 6:23 am

So, in the summer pictures are suffering from heat haze.

Do pictures with a subject distance That is around 20-50 meters also suffer from heat haze?

When in the summer there is heat haze, will your pictures be sharper in winter because of lower temperatures? I just started photographing couple of months ago and i only took pictures in the summer.

Thanks for the Info's
 
vikkyvik
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Joined: Thu Jul 31, 2003 1:58 pm

RE: Does Temperature Affect Photo Sharpness?

Sat Aug 24, 2013 7:06 am

Quoting michaelvandijk (Thread starter):
So, in the summer pictures are suffering from heat haze.

Heat haze can occur during all times of year. It's not dependent on absolute temperature, but rather on temperature gradients in the air. Basically, as it's usually created, the sun warms the ground, which then heats up the air immediately above it. That air is then hotter than the air above it, so you get convection, and hence heat haze as the differing air temperatures mix.

It tends to be worse in the summer, yes, but I've seen it pretty bad in the winter too (then again, winter in LA isn't exactly cold).

Quoting michaelvandijk (Thread starter):
Do pictures with a subject distance That is around 20-50 meters also suffer from heat haze?

Technically, as long as you have any air between you and your subject, you can get heat haze. But it's more noticeable with greater subject distance, and with higher zoom. I've certainly noticed it at air shows at not too great a subject distance.
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Scooter01
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RE: Does Temperature Affect Photo Sharpness?

Sat Aug 24, 2013 9:16 am

Quoting vikkyvik (Reply 1):
but rather on temperature gradients in the air.

Good example:

View Large View Medium
Click here for bigger photo!

Photo © Jason McDowell



Scooter01   
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JakTrax
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Joined: Thu Jun 30, 2005 3:30 am

RE: Does Temperature Affect Photo Sharpness?

Sat Aug 24, 2013 12:55 pm

There are two ways to reduce (but not always eliminate) the effects of heat-haze: getting as close to your subject as you can, and increasing your elevation.

Here in the UK we had an incredibly cold Mar/Apr, with early morning temperatures frequently dipping to -5C. However because the sun was rising quite high in the sky it was warming the ground nicely, giving us massive temperature variations between the air immediately above ground and that a little higher up. It produced some of the worst haze I've ever seen!

A primary reason why haze tends to be far less in winter is because the sun struggles to get high enough above the horizon to create the necessary temperature differences. Its rays can't penetrate enough of the atmosphere to do any real damage.

A good little trick I use for static aircraft is to wait for a large cloud to come over; the cloud casts its shadow and cools the ground, subduing any haze. When the cloud finally gives way I shoot the subject in the first hint of sunshine. Doesn't always work but effective 90% of the time, providing your subject isn't too far away.

Karl

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