RoamingScott wrote:
Alex does some really nice comparison videos, and to me, the rendering (and that includes sharpness and contrast) of the 1.8 clearly stands out from the 1.4.
Thanks for the helpful link! I "watched" with audio off so as to not be distracted by Alex's views before I formed my own.
I largely agree with you. If one's goal is to make the background less distracting the 1.8 is actually doing a better job even when the 1.4 is shot wide open. Yeah, the 1.4 bokeh is slightly "bigger", but it is also much more "busy" at the same time drawing attention to itself. The background "disappears" much more effectively in the 1.8 shots. And of course the 1.8 is also sharper at the plane of focus, not that the 1.4 is "soft" by any means.
All that said, sometimes folks want a blurred background that doesn't "disappear" but instead intend it as part of the composition. In that case the 1.4 bokeh is potentially advantageous as drawing attention to itself may be the photographer's desire.
To make a lame analogy, woodwind players are forever jumping between playing as part of an ensemble within the orchestra and playing as a solo accompanied by the orchestra. In both cases the woodwind is playing at the same time as much of the rest of the orchestra. The difference is in whether the woodwind is meant to "stand out" in that particular piece or passage. Players will use vibrato and sharper articulations to stand out from the orchestra in a solo accompanied section while they will use a steadier note and smoother articulation to blend in during ensemble sections. Neither playing technique is "more correct" or "better" than the other, they each have their use and place within orchestral music, often within the very same piece of music.
Anyway, that's an excellent comparison video that should help people better understand which lens is going to better suit their intent.