I make many photos around an object , but I can not find more pointers visible  in all image,how can I do a good Calibration ?
 
    Can I do as following?
 
    marker 1-8 visible in image 1-5
    marker 4-16 visible in image 3-8
    ....

Hello,
 
  Yes you can do this, but you need an overlap of 4/5 markers (Seems the case in your example).
 
The best case is "all markers are visible in all images", but this is almost never the case ...
So try to find markers that are visible in the most images first.
Markers should be visible in at least 3 images (forget markers visible only in 2 images).
 
Best,
 
Stef

Thank you!!