Originally posted by TechGuru Question: So what is the lowest f stop number I should be using at 300mm to avoid distortion/fringing? 16? According to the chart only 22 goes out to 300mm but it don't list the 16. Any idea why "16" is blue? Nothing else is blue.
All go to 300; it's just too cluttered as the lines will be so close to each other at 300mm; just extrapolate
Same reason why f/4, f/8 and f/16 are not indicated with lines; just estimate (f/16 is somewhere between f/11 and f/22)
Don't know about the blue; maybe optimum apertures.
And to prevent fringing, just don't shoot high contrast scenes
I would say, just try it and see.