Lens Calibrating


Feb 18, 2011
198
0
0
JB and Singapore
#1
Hi all.. I am quite new. I am currently on Canon lenses. How often do I need to calibrate my lenses? When do I know its time to be done? Can be done DIY or must send to Canon to do it? Thanks!! :)
 

liveevil

New Member
Jan 10, 2006
697
1
0
#2
If there is no front/back focusing problem you dont need to calibrate anything at all
 

SkyStrike

Moderator
Staff member
Nov 29, 2010
3,444
11
38
Somewhere
#4
Meaning.. if it can focus... no need to do anything? Unless it cant focus? Thanks.
Try http://focustestchart.com/chart.html. This document in the website explains what is Front/Back Focusing and tells you how to check if such problem exists on your lens.

As for calibration of lens, I think for many lens, you will have to head down to the respective service centers to do it. (Do a google search to see if DIY calibration is possible...http://www.steves-digicams.com/knowledge-center/how-tos/troubleshooting-repair/digital-camera-how-to-perform-your-own-lens-calibration.html)

Hope this helps
 

Octarine

Moderator
Staff member
Jan 3, 2008
12,516
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48
Pasir Ris
#6
Meaning.. if it can focus... no need to do anything? Unless it cant focus? Thanks.
There are more than one reason for the symptom 'cannot focus'. The test chart helps to determine the focus accuracy. But there are situations (low light / low contrast) where the AF sensor simply cannot get a lock. That's not a fault of the lens and no calibrating will help.
 

Octarine

Moderator
Staff member
Jan 3, 2008
12,516
30
48
Pasir Ris
#7
Meaning.. if it can focus... no need to do anything? Unless it cant focus? Thanks.
There are more than one reason for the symptom 'cannot focus'. The test chart helps to determine the focus accuracy. But there are situations (low light / low contrast) where the AF sensor simply cannot get a lock. That's not a fault of the lens and no calibrating will help.
 

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