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  #1  
Old 25th November 2013
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Two lenses, same subject, different colors...

Hello all,

I started this topic yesterday on our mini meetup in Greenwich, basically I am having issues with my 9-18mm to reproduce same or similar colors compared to 35-100mm F2.

To get an idea please look on those photos: https://drive.google.com/folderview?...1A3bVpLQmpCMGM
Included original .orf files and some processed .jpg for quick preview.

They were both take one after another, just after changing lenses. Different exposure though. First one comes from 35-100mm and the other while we were getting closer is from 9-18mm ad colors are completely different. Especially the sea.

On all of the photos that I took that time (this was during 3 days) the ones from 9-18mm are like that - too green I would say.

Is this because of the quality of both lenses? Or there are other things involved?

Thanks!
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Old 25th November 2013
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Re: Two lenses, same subject, different colors...

Hi Tomasz - this is an interesting technical topic that we discussed

I looked at the two shots and I can see the one with the wider view, which I assume is the 9-18, in the RGB green channel the histogram is further to the bright end of the scale than the other channels. By adjusting all three colour channels so they are lined up with each other the colour changed a lot and was less green.

This is similar to the case of the picture I was discussing with you where Auto adjustment of the camera image brought back the blue reflection in the surface of the water in the canal.

Ian
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Old 25th November 2013
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Re: Two lenses, same subject, different colors...

Thanks Ian, well after adjusting those levels properly it goes to blue but it's still different color of the water... some deep dark blue..

Was this caused by using aperture priority mode (which I was using)?
If I go manual would it change?
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Old 25th November 2013
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Re: Two lenses, same subject, different colors...

I don't think the exposure mode is the solution.

I wonder if it is a characteristic of a very wide angle lens compared to a telephoto lens.

Ian
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Old 25th November 2013
Ulfric M Douglas Ulfric M Douglas is offline
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Re: Two lenses, same subject, different colors...

Post two photos. Oh c'mon, it's not hard is it?
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Old 25th November 2013
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Re: Two lenses, same subject, different colors...

There is a link to those photos...
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Old 25th November 2013
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Re: Two lenses, same subject, different colors...

Check the exif re White balance, if you have auto white balance switched on, it could be the answer, 2 different readings.
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Old 26th November 2013
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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
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Old 26th November 2013
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Re: Two lenses, same subject, different colors...

I'm no expert but my first impression was that they have different polorisation.
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