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Message: <blockquote data-quote="denco@comcast.n" data-source="post: 3630191" data-attributes="member: 25300">Where did you read that? Everything I have read says the 10x56 slc is brighter. It would be highly unlikely that a 50mm would be brighter than a 56mm given equal quality optics especially since the SLC has AK prisms and the EL does not and the SLC has a transmission of 93% with the EL only being 90% .<a href="https://www.cloudynights.com/topic/585519-swarovski-el-10x50-vs-swarovski-slc-10x56/" target="_blank">https://www.cloudynights.com/topic/585519-swarovski-el-10x50-vs-swarovski-slc-10x56/</a>"Zeiss have long used a special type of prism that is neither a Porro nor a Schmidt-Pechan, but something called an Abbe-König - strictly another type of roof prism. The good thing about this type of prism is that the light is bent around by total internal reflection (just like porros), with no mirror coatings required (unlike conventional roofs). This means the 10x56 SLCs, like the Zeiss FLs and Dialyts, simply transmit more light than even the best conventional roofs. Swarovski quote 93% light transmission: that’s 3% more than the Swarovski ELs and so the view is a little brighter in the daytime. Interestingly, Swarovski don’t advertise this feature at all; I only know about it from reading a technical post on their blog and by noting it omits their ‘Swarobright’ mirror coatings (because it doesn’t have mirrors!)"</blockquote>