03-28-2013, 11:24 PM
Glass will absorb some colours of light more than others. The more elements there are, the stronger this effect can be. Some of my earlier budget Tamron and Sigma lenses in particular looked particularly yelow. The lens coatings can also have an effect on this, although now they will try to use it to balance the colour at the possible cost of a little light loss.
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.