Hello, pentaxians,
Yesterday I was asked by my facebook friend to do "image in focus repeatability test", using new Pentax-D FA* 50/1,4 on the Pentax K-1 camera.
I always focus with central focusing point and recompose after, but my friend is using non-central points too.
I have done lens focus microadjustment +6 after I bouhgt the lens, and focus with central point is accurate in most situations (about 70 percent).
But I was completely disappointed with non-central point focusing ability - absolutely all images are slightly out of focus. I tried different focusint points on the edge of focusing area, I shot different objects, but every time they were slightly out of focus (not so much, but not tack sharp as using central point). The accuracy of central point was about 70 percent.
Then I tried another lens - FA* 85/1,4. And about 70 percent of shots were in good focus using non-central focusing point.
This "test" was done handheld, at the evening, using 400W halogen lighting, ISO400. 10 shots series were done, every time I defocused the lens manualy.
What would be your thoughts and suggestions?
My friens said that he has such a problem with 24-70/2,8 lens, that focused pretty good 2 years ago.
Could the firmware updates be associated with focus points decalibration? I have heard that after update some people complain about the need to remake focus microadjustments of the same lenses.
Last edited by Medex; 09-21-2018 at 12:14 AM.