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Message: <blockquote data-quote="brocknroller" data-source="post: 3199700" data-attributes="member: 665">Squint Swedpat,"Theoretically" being the operating word. In practice, the perception of depth varies among bins of the same magnification due to Porro vs. roof, the speed of the focuser, and field curvature as mentioned in an earlier post. In comparing the old 8x32 EL to the 8x30 SLC, the EL gives a better perception of depth. In comparing the 8x30 EII to the 8x32 LX/HG, the EII gives a very noticeably better perception of depth. In comparing the 10x42 SE and the 10x42 SLC-HD, the SE gives a better perception of depth. In comparing the 8x32 SE to the 8x30 M7, the SE gives a better perception of depth. On paper all the eights have the same DOF, and all the tens have the same DOF but in the eye of the beholder they look different. The "eyes" have it!As to the 3-D effect only being perceived at a short distance, I can still see it at a distance of 300 ft. probably more, but that's as far as the treeline is from the house. Someone, it might have been Kimmo, said that he could still see the 3-D effect at a very long distance with a 15x60. Again, in "theory," perhaps this shouldn't be because of the Parallax Effect, but in practice, the 3-D effect extends beyond the PE point, perhaps because you're also seeing objects one in back of the other in the foreground within the PE distance. Joe Sixpack</blockquote>