View Single Post
  #9  
Old 26th November 2013
Nick Temple-Fry's Avatar
Nick Temple-Fry Nick Temple-Fry is offline
Full member
 
Join Date: Nov 2007
Location: Wiltshire
Posts: 4,395
Thanks: 17
Thanked 190 Times in 142 Posts
Likes: 0
Liked 5 Times in 5 Posts
Re: Two lenses, same subject, different colors...

I suspect the answer is quite complicated.

First of all there are the exposure and white balance decisions made by the camera - the fov varies between the two images so the camera will make different decisions.

Secondly there is Brewsters angle (the angle at which light becomes polarised when it hits a surface - which for fresh water is 53 degrees). You can see this if you stand by any body of water, the water close by has a natural colour/translucence whilst the water further away is opaque and may well be bright or dazzling. The further away you are the more pronounced the effect will be (which is why sometimes the sea near the horizon will appear painfully bright). The further away the subject is over water the more polarised glare the camera will have to cope with in making exposure/white balance decisions.

And thirdly, because wide angle lenses are hit by light from a greater range of incident angles I suspect that either in the coating or the lens glass components there is some correction for polarisation, just to maintain colour consistency across the image

Nick
__________________
Nick Temple-Fry

Medicine as a science ranks somewhere between archaeology and economics.

www.theChurchPhotographer.co.uk 90 Churches -- Fairford St Mary's, exceptionally splendid
www.temple-fry.co.uk
Reply With Quote
The Following User Says Thank You to Nick Temple-Fry For This Useful Post:
Turek (27th November 2013)
The Following User Liked This Post:
Graham_of_Rainham (27th November 2013)