Reply to thread

Message

<blockquote data-quote="aroy" data-source="post: 324998" data-attributes="member: 16090">. A fast lense gets more light wide open, so it is generally faster in AF.. Many fast lenses are sharper and more even across the field when stopped down. For example a F1.2 lense (or an F1.4 for that matter), may be much better at F4 than an F2.8 lense. So at times fast lenses are preferred even if you stop them.. Some fast lenses are designed for low light shooting. Here the &quot;comma&quot; reduction plays an important role. Comma is when a point of light (or say a candle) does not appear as a point but as a point with a tail. The &quot;Noctulux&quot; series are such lenses. In contrast he Nikon 50mm F1.2 is not a low light lense as it has a lot of comma, but at F1.2 it has tremendous bokeh, and beyond F2.8 it is better than most Nikon 50mm lenses.. Some lenses are designed to perform best at full aperture (most get better as you stop them down). The Zeiss 135mm F2 APO is one such lense. You gain very little in sharpness as you stop it down.In short in today's scenario a fast lense will focus faster, have a shallow DOF and may be sharper stopped down compared to slower lenses.</blockquote>

[QUOTE="aroy, post: 324998, member: 16090"] . A fast lense gets more light wide open, so it is generally faster in AF. . Many fast lenses are sharper and more even across the field when stopped down. For example a F1.2 lense (or an F1.4 for that matter), may be much better at F4 than an F2.8 lense. So at times fast lenses are preferred even if you stop them. . Some fast lenses are designed for low light shooting. Here the "comma" reduction plays an important role. Comma is when a point of light (or say a candle) does not appear as a point but as a point with a tail. The "Noctulux" series are such lenses. In contrast he Nikon 50mm F1.2 is not a low light lense as it has a lot of comma, but at F1.2 it has tremendous bokeh, and beyond F2.8 it is better than most Nikon 50mm lenses. . Some lenses are designed to perform best at full aperture (most get better as you stop them down). The Zeiss 135mm F2 APO is one such lense. You gain very little in sharpness as you stop it down. In short in today's scenario a fast lense will focus faster, have a shallow DOF and may be sharper stopped down compared to slower lenses. [/QUOTE]

Verification