>>The AP had more false color on Mars, worst near the edge of the field where a violet streak was seen (but not on stars, anywhere). >>
Lateral color (off-axis color) is always caused by the eyepiece. It is not caused by the objective lens. Eyepieces will always show more aberrations off-axis the faster the scope. At F6, the aberrations are 2 times worse than at F8, and 4 times worse than at F10. You will see lateral color even in a Newtonian.
Roland Christen
Lateral color (off-axis color) is always caused by the eyepiece. It is not caused by the objective lens. Eyepieces will always show more aberrations off-axis the faster the scope. At F6, the aberrations are 2 times worse than at F8, and 4 times worse than at F10. You will see lateral color even in a Newtonian.
Roland Christen