10-24-2019, 07:07 AM
(This post was last modified: 10-24-2019, 07:16 AM by Brightcolours.)
You call it "bubbles" when there is strong outlining. You mean "discs" I guess.
The reason why the DS sharper wide open is because in effect it is closed down, because of the defocus smoothing coating. So, even more impressive MTF results (it is not as if the non-DS is not impressive!), due to the stopped down character.
Why the non-DS? Obvious!
The DS has less shallow DOF (obviously, as the DS is "stopped down" by the DS coating). So if you are after that, you need the non-DS. The DS also takes in less light. And is more expensive.
The purple dashed lines show where (and on which elements) the DS coating technology is applied:
https://cweb.canon.jp/eos/rf/lineup/rf85...uction.png
- So, get the DS if bokeh smoothness is most important.
- Get the non-DS if shallow DOF or low light performance is most important. And save a bit of money ($300).
The reason why the DS sharper wide open is because in effect it is closed down, because of the defocus smoothing coating. So, even more impressive MTF results (it is not as if the non-DS is not impressive!), due to the stopped down character.
Why the non-DS? Obvious!
The DS has less shallow DOF (obviously, as the DS is "stopped down" by the DS coating). So if you are after that, you need the non-DS. The DS also takes in less light. And is more expensive.
The purple dashed lines show where (and on which elements) the DS coating technology is applied:
https://cweb.canon.jp/eos/rf/lineup/rf85...uction.png
- So, get the DS if bokeh smoothness is most important.
- Get the non-DS if shallow DOF or low light performance is most important. And save a bit of money ($300).