10-13-2010, 07:28 PM
[quote name='wim' timestamp='1286989047' post='3614']
Just one addition: DG generally also means that the rearmost lens element has been coated if that wasn't the case already.
You can check this by shooting with a bright light just outside the frame, and compare the shots against another lens, known to be of DG (any Canon EF lens) under the same conditions. If you do get a lot of flare, glare of veiling, it likely isn't coated, and may cause similar effects under "normal" shooting circumstances, if les spronounced. This because for film there wasn't the necesaity to do extensive coating on the back of the last element: film only reflects 2 to 3 % of the light received, while a digital sensor reflects about 40 to 60 %.
In short, check that it works with your camera, adn check that it doesn't show any significant amount of veiling, flare or glare.
Kind regards, Wim
[/quote]
I have the non-DG version and yes it suffers from a bit of flare and low-contrast if you are shooting directly into the light. However with this type of lens it is very rare to shoot in these circumstances and so is rarely a problem.
Allan
Just one addition: DG generally also means that the rearmost lens element has been coated if that wasn't the case already.
You can check this by shooting with a bright light just outside the frame, and compare the shots against another lens, known to be of DG (any Canon EF lens) under the same conditions. If you do get a lot of flare, glare of veiling, it likely isn't coated, and may cause similar effects under "normal" shooting circumstances, if les spronounced. This because for film there wasn't the necesaity to do extensive coating on the back of the last element: film only reflects 2 to 3 % of the light received, while a digital sensor reflects about 40 to 60 %.
In short, check that it works with your camera, adn check that it doesn't show any significant amount of veiling, flare or glare.
Kind regards, Wim
[/quote]
I have the non-DG version and yes it suffers from a bit of flare and low-contrast if you are shooting directly into the light. However with this type of lens it is very rare to shoot in these circumstances and so is rarely a problem.
Allan