I calculated the ideal (one) column width / line length for 9 and 10 pt Helvetica Neue Light.
I based a three column grid on the above calculation… The main text column width equals / spans two grid columns, the other column is for image captions.
Now… even with ample margins the main text column looks really narrow (on 312 x 237 mm paper)
If I increase the column width till visually pleasing, character count per line ends up way above acceptable.
Two narrow columns (each equal to one grid column) for the main text also doesn’t seem to work as there are too much long words / ends up below acceptable character count per line.
What are my options besides suggesting a different paper size?