Here is a halftone at 30 degrees ( 10lpi, 720 dpi, round dots, 70%

gray src, shading added to illustrate the angle pf the dots ).

You would expect the dots to be at a 30 degree angle.

Measure it with the ruler tool WTF, 26.6 degrees? Ok maybe photoshop's

ruler tool doesn't work, let's just double check the math. This image is 5697x2857 pixels

DEGREES(ATAN(2857/5697)) = 26.6012456003

gray src, shading added to illustrate the angle pf the dots ).

You would expect the dots to be at a 30 degree angle.

Measure it with the ruler tool WTF, 26.6 degrees? Ok maybe photoshop's

ruler tool doesn't work, let's just double check the math. This image is 5697x2857 pixels

DEGREES(ATAN(2857/5697)) = 26.6012456003