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Binoculars & Spotting Scopes
Binoculars
8x42mm bins...comparison of measurable features
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<blockquote data-quote="Kevin Purcell" data-source="post: 1344111" data-attributes="member: 68323"><p>But they're not all these standard numbers. And they're not far off ...</p><p></p><p>Zeiss 8x42 FL is 42/8 = 5.25mm. That's correct.</p><p></p><p>Leica 8x42 is 5.2mm that's 42/8 truncated to 1 decimal place. Marketers, what can you do!</p><p></p><p>Nikon 8x42 is 5.3mm that's 42/8 rounded up to 1 decimal place. That's correct.</p><p></p><p>Hawke 8x<strong>43</strong> is 5.34mm which is a little off from 43 / 8 = 5.37500 (internal stop? copying error?) but I doubt 35 microns is going to bug anyone.</p><p></p><p>Steiner is 8x<strong>44</strong> is 5.5mm which is correct: 44 / 8 = 5.5</p><p></p><p>Swaro EL is <strong>8.5</strong>x<strong>44</strong> so 44 / 8.5 = 5.17647059 is quoted at 4.9mm which is what Swaro say it is! Does it have an internal stop smaller than the image of the aperture at that point? I suspect it does. So it's effective aperture is 41.65mm. Perhaps Swaro didn't want to use the outer 1mm or so of the lens.</p><p></p><p><a href="http://www.swarovskioptik.at/" target="_blank">http://www.swarovskioptik.at/</a></p></blockquote><p></p>
[QUOTE="Kevin Purcell, post: 1344111, member: 68323"] But they're not all these standard numbers. And they're not far off ... Zeiss 8x42 FL is 42/8 = 5.25mm. That's correct. Leica 8x42 is 5.2mm that's 42/8 truncated to 1 decimal place. Marketers, what can you do! Nikon 8x42 is 5.3mm that's 42/8 rounded up to 1 decimal place. That's correct. Hawke 8x[B]43[/B] is 5.34mm which is a little off from 43 / 8 = 5.37500 (internal stop? copying error?) but I doubt 35 microns is going to bug anyone. Steiner is 8x[B]44[/B] is 5.5mm which is correct: 44 / 8 = 5.5 Swaro EL is [B]8.5[/B]x[B]44[/B] so 44 / 8.5 = 5.17647059 is quoted at 4.9mm which is what Swaro say it is! Does it have an internal stop smaller than the image of the aperture at that point? I suspect it does. So it's effective aperture is 41.65mm. Perhaps Swaro didn't want to use the outer 1mm or so of the lens. [url]http://www.swarovskioptik.at/[/url] [/QUOTE]
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8x42mm bins...comparison of measurable features
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