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NZ107
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RE: Pre-Screening/Comair25

Sat Jun 30, 2012 8:06 pm

1. Seems slightly blurry in some places. You might want to reduce the exposure too.
2. High in frame
3. Doesn't seem too bad but could be brought down in the frame a little
4. Again maybe slightly too blown out on the top.
5. Overexposed top too, not sure on the motive with regards to cropping some of the engine off like that
It's all about the destination AND the journey.
 
vikkyvik
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RE: Pre-Screening/Comair25

Sat Jun 30, 2012 9:59 pm

The light doesn't look very good in a bunch of them - looks like the sun was pretty high up in the sky.
I'm watching Jeopardy. The category is worst Madonna songs. "This one from 1987 is terrible".
 
Tomskii
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RE: Pre-Screening/Comair25

Sat Jun 30, 2012 11:36 pm

5th one is a no go due to a lot of heat haze  
Nikon D90 + Nikkor f4.5-5.6 18-105mm + Tamron f4-5.6 70-300mm
 
JakTrax
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RE: Pre-Screening/Comair25

Sun Jul 01, 2012 12:09 am

Quoting Tomskii (Reply 3):
5th one is a no go due to a lot of heat haze

I was just about to point it out until I saw this. Like a bowlful of jelly so I'd say a definite no-go.

Karl
 
henkita217
Posts: 461
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RE: Pre-Screening/Comair25

Sun Jul 01, 2012 6:04 am

I have a question regarding the crop of photo #5, disregarding the other issues, whilst focussing only on the crop and motive.
As raised by NZ107, the crop questions a possibility of motive issues. I am in the process of working on an image where I need to consider the crop of the engine carefully.

If I could use the following image as example or "inspiration" for the crop I am planning to do...


View Large View Medium
Click here for bigger photo!

Photo © Thierry Balzer



As can be seen from the photo, the engines were cut off in the crop.

I guess my question would be, when is it appropriate to do such crop? Is it subjective?
I am aware the image was added in 2008. Perhaps the leniency of the rule has changed between then and now?

What are your thoughts?
 
comair25
Topic Author
Posts: 214
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RE: Pre-Screening/Comair25

Sun Jul 01, 2012 2:22 pm

thx guys Ill try and fix what I can. Ya both days the sun was pretty high not much I could do about it
 
Tomskii
Posts: 451
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RE: Pre-Screening/Comair25

Sun Jul 01, 2012 4:04 pm

Quoting comair25 (Reply 6):
thx guys Ill try and fix what I can. Ya both days the sun was pretty high not much I could do about it

Best you can do on days that are hazy is to get the planes on approach. That way the heat haze isn't so prominent anymore and thus you have a lot less to none of it in your picture.  
Nikon D90 + Nikkor f4.5-5.6 18-105mm + Tamron f4-5.6 70-300mm
 
comair25
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RE: Pre-Screening/Comair25

Sun Jul 01, 2012 6:10 pm

Quoting Tomskii (Reply 7):

Well I didn't mean the head haze. I know there is nothing I can do about that lol
 
JakTrax
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RE: Pre-Screening/Comair25

Sun Jul 01, 2012 10:36 pm

Heat haze is an often misunderstood phenomenon, and isn't always down to heat; although it's certainly much more prevalent on warmer days. While avoiding subjects on the ground and getting as close to your subject as you can help, such methods of avoidance are by no means guaranteed to work. Heat haze is also very often present in the air, so the most effective method is to put as little distance as you can between yourself and what you want to shoot. Airborne heat haze is slightly different and involves either warm air rising as thermals, or air layers of differing temperatures atop one another. Poor air quality (e.g. hazy days) is also guilty of producing heat haze and heat haze-like effects.

Karl
 
vikkyvik
Posts: 11757
Joined: Thu Jul 31, 2003 1:58 pm

RE: Pre-Screening/Comair25

Mon Jul 02, 2012 5:20 am

Quoting JakTrax (Reply 9):

I have to admit I'm a bit confused; heat haze is always an airborne phenomenon, whether it's near the ground or not.

In pretty much every case, it's a result of convection - warmer air rising over cooler air. Whether the air is heated by the ground or the sun, it still causes convection, and hence heat haze.

Ultimately, it's a result of temperature differentials, which as you said, can occur on warm or cool days.
I'm watching Jeopardy. The category is worst Madonna songs. "This one from 1987 is terrible".
 
Tomskii
Posts: 451
Joined: Sat May 14, 2011 10:42 am

RE: Pre-Screening/Comair25

Mon Jul 02, 2012 11:35 am

Quoting JakTrax (Reply 9):

True but heat haze is also caused by the warm tarmac/buildings etc isn't it?
Nikon D90 + Nikkor f4.5-5.6 18-105mm + Tamron f4-5.6 70-300mm
 
JakTrax
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RE: Pre-Screening/Comair25

Mon Jul 02, 2012 3:31 pm

Vik's making things complicated again.....  

Most people think heat-haze only exists immediately above ground, so I described it as 'airborne' with reference to that which develops way above ground level (as in 500ft in the air). Whilst the phenomenon is usually much worse the closer to the ground you get (because the ground heats up and releases energy quickly) the belief that shooting aircraft high in the air eliminates it isn't true. Sure, the chances can be improved but you'll find a lot of people who think it is only generated by the earth/ground. As Vik says it isn't generated by the ground per se but by layers of air at different temperatures. Since these layers normally have greater temperature differences close to the ground (due to the heating of the ground) that's where you tend to most often see it.

No way of eliminating it but you can reduce the risk by...

a) getting as close to your subject as you can
b) Getting significantly elevated
c) shooting early morning or late afternoon/evening
d) not using your lens at 400mm at mid-day in July on a subject two miles away!

Karl
 
vikkyvik
Posts: 11757
Joined: Thu Jul 31, 2003 1:58 pm

RE: Pre-Screening/Comair25

Mon Jul 02, 2012 8:42 pm

Quoting JakTrax (Reply 12):
Vik's making things complicated again.....

Sorry, I'm REALLY good at that!

Quoting JakTrax (Reply 12):
so I described it as 'airborne' with reference to that which develops way above ground level (as in 500ft in the air).

Ah, I gotcha.

I've gotten some pretty bad heat haze on relatively cool days. Always a bit frustrating!
I'm watching Jeopardy. The category is worst Madonna songs. "This one from 1987 is terrible".
 
JakTrax
Posts: 4635
Joined: Thu Jun 30, 2005 3:30 am

RE: Pre-Screening/Comair25

Mon Jul 02, 2012 9:42 pm

I guess the term 'heat-haze' covers a few very similar phenomena. Distortion high in the air can be caused by warm air rising in thermals, and so is very similar. This can be a big problem here in the UK when sodden ground releases energy, which rises in columns and forms cumulus cloud at the tops.

I've also noticed that hazy air produces distortion in photos, but I'm guessing it's due to similar reasons.

Whatever you want to call it, and however it's triggered, it's exactly why I tend not to shoot between 09:30 and 17:00 this time of year (unless I'm really, really close to the aircraft)!

One has to wonder how many decent copies of long lenses get erroneously returned as faulty due to people mistaking the effects of heat-haze for a fault with the lens.....

Karl

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