Why does the imaging look blurry?

Imaging might be blurry without calibrating camera parameters in prior (ex. out of focus). Please calibrate camera parameters by following the steps below before taking photos.

1) Adjust Focusing/diopter ring until the imaging clearly shown;
2) Clean the dust covers on camera lens via rubber suction bulb. Stubborn stain can be clean via soft cloth;
3) Calibrate the shutter.

If the imaging are still blurry, pls contact us for further assistance.