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Message: <blockquote data-quote="Zamdrang" data-source="post: 3222037" data-attributes="member: 131657">Paddy and David,  thanks for pointing out those links, very helpful.   It sounds like I was on the right track with the edge of the prism being the culprit for the spikes.   I am undecided whether it is a big deal to me, but with this pair at least it is very apparent and impossible to overlook..  maybe i'm spoiled by porros <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />  This purchase for me was just a general all around comfortable bino, with low light and astro use being part of that so I need to weigh it vs the cost of finding some that don't exhibit this.  Truthfully as much as I enjoy the science and evaluation of things, I don't really have the enthusiasm to spend reading up on the subject.   I need to try them on some stars, it has been cloudy since I got them.  As you said David... streetlights are not a primary target...<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />     The 8.5 replacement should be here next week and I will see how they stack up as well.  Thanks again.</blockquote>