I enjoyed this eyepiece at nighttime with a 6 f/8 APO. In the daytime, the entire outer field is bright orange. Ive read some reports of it being insignificant, I have no idea how someone could come to that conclusion, it was bright, orange, and obvious. Id guess the outer field color correction is just as bizarre at night, except that its too dim to pick up on. I never tried it on the moon or Venus off axis. For the cost and the daytime performance, I could never love this eyepiece.

Al really came off the rails on this one. As indicated by others, it has a terrible orange band at the edge, and yes you can reduce it quite a bit ... by holding your eye at exactly the right place. Its very similar to the movement constrictions of a 55mm Plossl. What good is edge correction (that is only a bit better than the 35 Panoptic) if it forces you to hold such a strict eye position to use it? Plus, eye relief is dismal, and at $620 it is a total disssapointment. Get the 35 Panoptic and the 22 Panoptic for only $25 more than the price of this single bloated overweight money sucker. Just look at the specs and then plot the FOV, Im loosing less than 4 arc. min of FOV to the 31, with a 35 in my 20 Obsession. Look at the reviews for the 35 and 22 Panoptics.

Was very disapointed with this EP, the entire outside perimeter is all yellow. It is not defective, I spoke to others and everyone observed the same. I know the manufacturer wants to boast the extreme wide view, but that entire color soaked area should have been masked out.