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Forums > Back > Do-it-yourself centering sanity check
Klaus
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#15
04-06-2011, 04:32 PM
I was asked why it is easier to spot the problem in a defocused image.



Here's a reference again from the Sony lens.

You can surely spot that the to edges to the top and right appear to be "closer to focus" than the other two which are much softer.





[Image: defocus.jpg]





Here's the in-focus reference again:



[Image: shiftedcentering.jpg]



Just to mention - this is not a rule for the image borders. This is only a sanity check which can be performed on the image center. At the borders we've all kinds of funny aberrations (optical defects) which can, more or less, resemble a centering issue (e.g. field curvature).
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Messages In This Thread
Do-it-yourself centering sanity check - by Klaus - 04-05-2011, 07:27 PM
Do-it-yourself centering sanity check - by popo - 04-05-2011, 07:40 PM
Do-it-yourself centering sanity check - by Klaus - 04-05-2011, 07:52 PM
Do-it-yourself centering sanity check - by IanCD - 04-05-2011, 10:01 PM
Do-it-yourself centering sanity check - by netrex - 04-06-2011, 12:11 AM
Do-it-yourself centering sanity check - by Klaus - 04-06-2011, 05:27 AM
Do-it-yourself centering sanity check - by Ayoh - 04-06-2011, 06:23 AM
Do-it-yourself centering sanity check - by Klaus - 04-06-2011, 06:44 AM
Do-it-yourself centering sanity check - by Steinar1 - 04-06-2011, 08:56 AM
Do-it-yourself centering sanity check - by Klaus - 04-06-2011, 09:12 AM
Do-it-yourself centering sanity check - by Guest - 04-06-2011, 11:33 AM
Do-it-yourself centering sanity check - by Steinar1 - 04-06-2011, 12:48 PM
Do-it-yourself centering sanity check - by mst - 04-06-2011, 01:31 PM
Do-it-yourself centering sanity check - by Klaus - 04-06-2011, 01:47 PM
Do-it-yourself centering sanity check - by Klaus - 04-06-2011, 04:32 PM
Do-it-yourself centering sanity check - by Steinar1 - 04-06-2011, 10:02 PM
Do-it-yourself centering sanity check - by DenisLV - 08-24-2012, 07:52 AM
Do-it-yourself centering sanity check - by Rainer - 08-24-2012, 06:42 PM
Do-it-yourself centering sanity check - by DenisLV - 08-25-2012, 09:02 AM
Do-it-yourself centering sanity check - by ouki - 10-04-2013, 11:31 PM
Do-it-yourself centering sanity check - by Klaus - 12-28-2013, 08:28 AM
Do-it-yourself centering sanity check - by josa - 02-17-2014, 11:00 AM
Do-it-yourself centering sanity check - by mst - 02-17-2014, 03:00 PM
Do-it-yourself centering sanity check - by josa - 02-17-2014, 06:26 PM
Do-it-yourself centering sanity check - by casual snapper - 02-17-2014, 08:47 PM
Do-it-yourself centering sanity check - by Guest - 02-18-2014, 04:12 PM
Do-it-yourself centering sanity check - by casual snapper - 02-21-2014, 03:36 PM
Do-it-yourself centering sanity check - by TomPhillpotts - 11-20-2014, 01:50 AM
Do-it-yourself centering sanity check - by Klaus - 11-20-2014, 08:48 AM
Do-it-yourself centering sanity check - by TomPhillpotts - 11-20-2014, 10:48 AM
Do-it-yourself centering sanity check - by davidmanze - 11-20-2014, 09:29 PM
Do-it-yourself centering sanity check - by Klaus - 11-21-2014, 11:39 AM
Do-it-yourself centering sanity check - by Klaus - 11-22-2014, 11:39 AM
Do-it-yourself centering sanity check - by Bghead8che - 12-05-2015, 11:49 PM
Do-it-yourself centering sanity check - by Guest - 12-06-2015, 01:19 PM
Do-it-yourself centering sanity check - by toni-a - 06-21-2016, 07:42 PM
Do-it-yourself centering sanity check - by Reinier - 10-01-2016, 02:21 PM
Do-it-yourself centering sanity check - by Klaus - 02-13-2018, 11:45 PM

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