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Message: <blockquote data-quote="brocknroller" data-source="post: 3283877" data-attributes="member: 665">Another non-ersatz parameter impacting the 3-D effect... This reminded me of something that Surveyor wrote a while back, namely, that companies can purposely impact the 3-D effect by tweaking the alignment of the lenses and prisms. I don't remember the details, but this wasn't a haphazard misalignment but rather something that companies did purposely to enhance the view. If anyone remembers what he wrote, please chime in. He wrote this in response to my surprise that the ZR 7x36 ED2 roof seemed to have about as good a 3-D view as my 8x30 EII porro. I thought that perhaps this was due to the 7x having better depth of field than 8x, but this alone didn't seem enough considering it was still a roof vs. porro. When looking at a group of people standing in a circle at a distance (~400 ft.) I could see them separated from each other at a distance that was close to what I could see naked eye, maybe a bit less. What really surprised me is that the group seemed to be separated apart a bit more through the ED2. With the 8x32 LX, which Kimmo said has the objectives slightly close together than the EPs, the people seemed to be standing right in front of each other rather than a few feet apart. According to Surveyor, the perception of greater depth was due to the way the optics were aligned in the 7x ED2, which he had examined. This could explain why some roofs (all with S/P prisms) seem to show better 3-D than others. Other factors that Henry mentioned such as field curvature might also contribute to these differences so that when all added up, one roof of the same magnification looks noticeably different than the other in regard to depth perception and 3-D effect. Brock</blockquote>

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