Agisoft Metashape

Agisoft Metashape => Camera Calibration => Topic started by: rexsham on July 05, 2014, 11:49:50 AM

Title: Minimum size of calibration pattern and near limit of camera
Post by: rexsham on July 05, 2014, 11:49:50 AM

Hi,
We need to calibrate a Full Frame DSLR Camera using 35mm lens for aerial survey.
We will fly at a height of 300m so we set the focus to a point that the subject distance is 300m and the near limit of Depth of field is around 5m.

That means within a 5m distance, our camera will not be able to acquire a sharp image.
I see that the lens calibration software is using the monitor to display the checker board, since the monitor is small, if I use this lens focus ring setting to calibrate, I will get a blurry result if I do not turn the ring to refocus on the screen.

I want to know, if the calibration still works if I calibrate with the same focus ring setting for a 300m subject and acquire a blurry image of the checker board or should I turn the focus ring to make a sharp image when doing the calibration?

Title: Re: Minimum size of calibration pattern and near limit of camera
Post by: rexsham on July 05, 2014, 11:51:10 AM

Another way of asking the question is:
Will turning the focus ring affect the calibration results?

Title: Re: Minimum size of calibration pattern and near limit of camera
Post by: Jamin on September 03, 2014, 12:30:41 AM

I too would like to know the answer to this.

I'm working with a d810 coupled to a 28mm...infinity focus would require a massive checkerboard....