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Message: <blockquote data-quote="Kevin Purcell" data-source="post: 1751136" data-attributes="member: 68323">It's not "low frequency" contrast either (I think).contrast == white level / black level == brightness / scattered lightThe brightness (transmission) of the bin sets the maximum white level.The scattered light in the black parts of the image sets the black level.If you make the bin brighter and have the same fraction of scattered light you get the same contrast. If you can control (minimize) the scattered light then you improve the contrast. If you turn down the brightness then the scattered light will drop and perhaps it ceases to be detectible by you. That might be perceived as high contrast.It might be a change in contrast with spatial frequency (i.e. what an MTF measures) where the measured contrast decreases as the spatial frequency increases and eventually you get no contrast at the limit of resolution of the binoculars (you can see no detail in the features at or below the resolution limit). The shape of that curve may be different between the two bins and that's what we are perceiving.Color biases in between bins can have an effect here. In the same way that a flat audio system sounds "less real" after you've been adding some bass enhancement. In this case the SE is warmer and the Zeiss more neutral. Or bluer as most people say having been biased by warmer/redder bins or even slightly (blue?) greener I think as Henry described them.The effect I'm talking about is not sharpness (the perceptual version of resolution) as both of these bins have sharpness below that of your eye. And the FLs actually control longitudinal and lateral CA better than the SEs which probably contributes to sharpness in the FL.The effect is something oddly different. I bet you the German's have a word for it <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /></blockquote>

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