Lens appears to front focus, but actually isn't?


Jun 11, 2009
741
0
0
31
Singapore
#1
Anyone ever experience such a weird situation with large aperture prime whereby the lens appears to have front focus on focus chart and "battery test" but yet is focusing correctly in real world usage?
 

xtunbox

New Member
Jul 5, 2010
194
0
0
#3
I encountered it with a prime lens 50mm f1.7 which I have recently purchased. I thought either my lens or camera went bonkers..
I even plan to send my camera in for service. :sweat:
 

luckyorange

Senior Member
Jan 13, 2011
2,839
0
0
Ang Mo Kio
#4
I encountered it with a prime lens 50mm f1.7 which I have recently purchased. I thought either my lens or camera went bonkers..
I even plan to send my camera in for service. :sweat:
50mm f1.8 i guess?
 

pinholecam

Moderator
Staff member
Jul 23, 2007
10,932
85
48
#8
Can be a couple of things :
1. Check your viewfinder diopter. You can adjust that.
2. Focus screen is not properly calibrated wrt AF sensor. (so sensor is accurate but screen is not); Can try service center or focus screen need adjustments via shimming.
3. AF inaccuracy
4. Something else, go to service center.
 

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