[jsmoraes (Jorge)]

Dunk, this image hasn't a star with spikes, therefore it is hard to say about focus. Althought if you analyse the center of stars, they don't show problem with focus.
I didn't strong sharp. I always prefer some blur around stars, it seems to me more natural than a well delimited spot.

Really, I can not say if there is some problem with focus. At Astrobin, in full resolution mode, the image is with native resolution of CR2 RAW file from Canon T3: around 0.7 arcsec ( I prefer to think around 1.4 arcmin because of the oscilation of guinding). With my set of equipment and Canon when I have problem with focus the stars loose the round shape. They strech vertical or horizontal.

note:
I have only one identification of star in Astrobin.

If I consider the resolution of 0.7"/px, the star HD 133063 has 17 pixels, or 11.9 arcsec of diameter.

If I consider the resolution of 1.4"/px, it has 23.8 arcsec

If we find the apparent angular diameter of this star... we can know if the image is with good focus. I didn't find this information, yet.