Worst is one stop down? I think not. I do not ever remember seeing this fact on any MTF charts at Photozone.de. But, maybe I am wrong. Link please.
gasrocks Cream of the Crop  13,432 posts Likes: 2 Joined Mar 2005 Location: Portage, Wisconsin USA More info | Feb 26, 2011 13:58 | #16 Worst is one stop down? I think not. I do not ever remember seeing this fact on any MTF charts at Photozone.de. But, maybe I am wrong. Link please. GEAR LIST
LOG IN TO REPLY |
egordon99 Cream of the Crop 10,247 posts Likes: 3 Joined Feb 2008 Location: Philly 'burbs More info | Feb 26, 2011 14:43 | #17 JeffreyG wrote in post #11918485  The 24-70 will be at its sharpest at f/5.6 to f/8, but it should still be very sharp close to wide open. I generally don't pick apertures based on sharpness, I just pick the aperture I need for the depth of field I want. Agreed....You should concentrate more on lighting, exposure, and composition than trying to get the sharpest picture.
LOG IN TO REPLY |
anscochrome Senior Member  443 posts Likes: 37 Joined Jan 2010 More info | Feb 26, 2011 18:35 | #18 One other point-sharpness chasing MUST be accompanied by a stable platform-stable tripod (not a 40 dollar special), stable tripod head (again, not a 40 dollar special), mirror lockup/or live view (mirror lockup is used with live view by default). remote release-otherwise the point of eeking the very last bit of sharpness from a lens is moot. http://anscochrome.zenfolio.com
LOG IN TO REPLY |
whiteflyer Goldmember  More info | Feb 26, 2011 18:54 | #19 As above each lens is different and most will say a stop or two down is best. The Digital Picture website wrote: DLA (Diffraction Limited Aperture) is the result of a mathematical formula that approximates the aperture where diffraction begins to visibly affect image sharpness at the pixel level. Diffraction at the DLA is only barely visible when viewed at full-size (100%, 1 pixel = 1 pixel) on a display or output to a very large print. As sensor pixel density increases, the narrowest aperture we can use to get perfectly pixel sharp images gets wider. DLA does not mean that narrower apertures should not be used - it is simply the point where image sharpness begins to be compromised for increased DOF and longer exposures. And, higher resolution sensors generally continue to deliver more detail well beyond the DLA than lower resolution sensors - until the "Diffraction Cutoff Frequency" is reached (a much narrower aperture). The progression from sharp the soft is not an abrupt one
LOG IN TO REPLY |
Manu2009 Member 77 posts Joined Feb 2011 Location: Gatineau, Qc Canada More info | Feb 26, 2011 19:12 | #20 This is maybe not the best tool but it's a start. Gear: Canon 50D + Tamron 17-50mm f/2.8 + Canon 55-250mm IS f/4-5.6
LOG IN TO REPLY |
Feb 27, 2011 05:53 | #21 BestVisuals wrote in post #11918769 The worst f/stop is one stop down from wide open, for many lenses. Most lenses are optimized for wide-open resolution, but f/8 is generally the best compromise between sharpness, DOF and diffraction. gasrocks wrote in post #11918809 Worst is one stop down? I think not. I do not ever remember seeing this fact on any MTF charts at Photozone.de. But, maybe I am wrong. Link please. I think not as well. Indeed, this is the opposite of almost every comment I've read on this subject. Frank Hollis - Retired mass spectroscopist
LOG IN TO REPLY |
RoyMathers I am Spartacus!  43,850 posts Likes: 2915 Joined Dec 2006 Location: Hertfordshire, United Kingdom More info | Feb 27, 2011 06:07 | #22 BestVisuals wrote in post #11918769 The worst f/stop is one stop down from wide open, for many lenses. Most lenses are optimized for wide-open resolution.... Where on earth did you get this from?
LOG IN TO REPLY |
 | x 1600 |
| y 1600 |
| Log in Not a member yet?
Register to forums
Registered members may log in to forums and access all the features: full search, image upload, follow forums, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, all settings, view hosted photos, own reviews, see more and do more... and all is free. Don't be a stranger - register now and start posting!
|
| ||
| Latest registered member is IoDaLi Photography 1744 guests, 136 members online Simultaneous users record so far is 15,144, that happened on Nov 22, 2018 | |||
