Blue Sky With Two Shades: OK this I don't understand hope someone can help. If you go about 2/3 up in the center of the picture you will see a straight line running at a slight angle...

to old Loc: New York

OK this I don't understand hope someone can help. If you go about 2/3 up in the center of the picture you will see a straight line running at a slight angle form left to right downward with a darker shade of blue on top. Could it be the polarized filter on the lens or is it the camera. Rebel T1i with 18-55mm lens.

Rongnongno Loc: FL

err.. Post the original?

PixelStan77 Loc: Vermont/Chicago

Did you have a Polarizer on the lens? Did you rotate it before you created the image and see any difference?

to old Loc: New York

yes i had the polarizer on and did rotate it, but I differently did not see that line in my view finder.

CO

I don't see the line you describe but I do see the darker blue area you describe. I never use a polarizer on the sky with a focal length less than 50mm. You can often get uneven polarization across the sky when using polarizers on wide angle lenses.

mrjcall Loc: Woodfin, NC

to old wrote:

OK this I don't understand hope someone can help. If you go about 2/3 up in the center of the picture you will see a straight line running at a slight angle form left to right downward with a darker shade of blue on top. Could it be the polarized filter on the lens or is it the camera. Rebel T1i with 18-55mm lens.

Appears to just be what we normally call a 'sun ray' caused by the sun shining through and clouds and creating a sharp shadow effect in the moisture in the atmosphere. Nothing so mysterious as polarizing issues.... 8-)

Trentc Loc: Denver, CO

Without the original, it is hard to tell, but it looks like maybe a high cloud behind the larger clouds. Just a thought.

CatMarley Loc: North Carolina

to old wrote:

OK this I don't understand hope someone can help. If you go about 2/3 up in the center of the picture you will see a straight line running at a slight angle form left to right downward with a darker shade of blue on top. Could it be the polarized filter on the lens or is it the camera. Rebel T1i with 18-55mm lens.

Looks like the effect of sun on water vapor. Quite normal in sky.

to old Loc: New York

To mrjcall;
After a considerable amount of e-mail to canon techs they agree with your explanation and suggest that when I frame just the sky and clouds I should not use a polarizer, it will just make effect worse depending on the moisture in the air and the angle of the sun. Thanks for the input.

mrjcall Loc: Woodfin, NC

to old wrote:

To mrjcall;
After a considerable amount of e-mail to canon techs they agree with your explanation and suggest that when I frame just the sky and clouds I should not use a polarizer, it will just make effect worse depending on the moisture in the air and the angle of the sun. Thanks for the input.

No problem. I actually like the effect btw.... 👍

CatMarley Loc: North Carolina

to old wrote:

To mrjcall;
After a considerable amount of e-mail to canon techs they agree with your explanation and suggest that when I frame just the sky and clouds I should not use a polarizer, it will just make effect worse depending on the moisture in the air and the angle of the sun. Thanks for the input.

Polarizers darken the blue sky and make for more dramatic cloud formations. So what if it accentuates atmospheric effects like your two toned blues it makes the picture all the more dramatic. Go for it. Keep the polarizer!

James R. Kyle Loc: Saint Louis, Missouri (A Suburb of Ferguson)

CatMarley wrote:

Polarizers darken the blue sky and make for more dramatic cloud formations. So what if it accentuates atmospheric effects like your two toned blues it makes the picture all the more dramatic. Go for it. Keep the polarizer!

+++++++++++++++

Yep!

I was going to write something on the order of what "Cat" wrote...

Thank you, "Cat"... ;-)

mcveed Loc: Kelowna, British Columbia (between trips)

Yes, the dark blue is simply a shadow of one of the clouds. In the lighter area water vapour in the air is being lit up by sunlight. Polarizer has nothing to do with this effect but will emphasize it by darkening th entire sky.