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Message: <blockquote data-quote="Chosun Juan" data-source="post: 3623350" data-attributes="member: 92780">Nicely put Bill  :t:  I hope the OP takes note   :cat:When EP's and Brightness in two instruments are so similar that we are getting to the thresholds of human perception, the question of which one is 'better' as the sun dips over the ol' horizon and off to warm (or fry! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> someone else's cockles, becomes a bit like shuffling deck chairs on the Titanic ..... there might be some momentary advantage - but ultimately you're not going to be seeing much!  :eek!:I've compared two bins during that lovely time of afternoon as the light engoldens  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />  and the shadows lengthen and with the p**fteenth in difference between the Swift Audubon 8.5x44 ED and another similarly parametered bin, I can detect a difference (on the day, and for a particular MOMENT, and considering whether or not I've had carrots for lunch! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />  :cat:  ..... but it's like horse race:-It's Brightness by half a length, but here comes EP - It's Brightness - it's EP, it's EP - it's neck and neck ,oh and with a late charge down the outside it's their progeny - Effective Brightness by a short half head!Ultimately, other factors come in to play, like the feel and balance of the instrument, the ergonomics,  and  the particular 'flava' of the AR Coating recipe and resultant colour rendition (unless you prefer color! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> and how you like all of those. .....  :cat:"And, would the findings of ONE HOUR be the same for the [SAME] individual under different physiological and environmental conditions, the next? Different tests performed at different times with different subjects having different ranges of accommodation for different visual acuities under different conditions will produce different results."  ..... definitely a Second Ed paragraph right there Bill  :t:Finally, let the OP be informed enough about the Zeiss x54 HT that they go and read the threads here on BF of reputable testers who've eyeballed the thing and had some consequential things to say ..... !  Fair warning.   :cat:Chosun    :gh:</blockquote>

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