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<blockquote data-quote="Vespobuteo" data-source="post: 3488003" data-attributes="member: 120830"><p>I suspect it's the eye cup design and depth that is the difference.</p><p>All (large) manufacturers most likely follow the ISO standard for ER measurements.</p><p></p><p>SV:s the eye cup rim steals about 5-6 mm of effective ER. Eye glasses are seldom completely flat either so if not pushing them against eye cup, the loss might be even more.</p><p></p><p><strong>Swaro should definitely supply shallower eye cups (more eye glass friendly) as an alternative. </strong></p><p><strong>(They do for the ATX scopes)</strong></p><p></p><p>Noctivid's eye cup looks shallower to me than SV's:</p><p></p><p><a href="https://us.leica-camera.com/resizer/image?width=1003&height=564&url=https://i.vimeocdn.com/video/587349554_1280.jpg" target="_blank">https://us.leica-camera.com/resizer/image?width=1003&height=564&url=https://i.vimeocdn.com/video/587349554_1280.jpg</a></p><p></p><p>Assume it's 4 mm, 19mm - 4mm would be more than 20mm - 6mm.</p><p>1 mm can make a significant difference in eye relief.</p></blockquote><p></p>
[QUOTE="Vespobuteo, post: 3488003, member: 120830"] I suspect it's the eye cup design and depth that is the difference. All (large) manufacturers most likely follow the ISO standard for ER measurements. SV:s the eye cup rim steals about 5-6 mm of effective ER. Eye glasses are seldom completely flat either so if not pushing them against eye cup, the loss might be even more. [B]Swaro should definitely supply shallower eye cups (more eye glass friendly) as an alternative. (They do for the ATX scopes)[/B] Noctivid's eye cup looks shallower to me than SV's: [url]https://us.leica-camera.com/resizer/image?width=1003&height=564&url=https://i.vimeocdn.com/video/587349554_1280.jpg[/url] Assume it's 4 mm, 19mm - 4mm would be more than 20mm - 6mm. 1 mm can make a significant difference in eye relief. [/QUOTE]
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