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<blockquote data-quote="WayneF" data-source="post: 136932" data-attributes="member: 12496">Sorry, diffraction is caused by only the lens aperture.&nbsp; You are right only in this degree:&nbsp; Opening the f/stop (wider aperture) makes the edge effect be less significant, less of the total light passing through is affected by the edge -&nbsp; whereas stopping it down makes diffraction much more significant (much more edge effect to total area).&nbsp;&nbsp; It absolutely is 100% caused by the lens aperture.Not sure I would name it an aberration, as much as a property... that is, it cannot be corrected,&nbsp; Wider aperture is better though, in this one property.When a photo lens test report shows the measured resolution dropping off the more it is stopped down, what do you imagine causes that?&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />When a smaller telescope has less theoretical resolution (larger Airy Disk) than a larger one, why do you imagine that is?Greater diffraction is why that is.&nbsp; It has nothing to do with the sensor.</blockquote>

[QUOTE="WayneF, post: 136932, member: 12496"] Sorry, diffraction is caused by only the lens aperture. You are right only in this degree: Opening the f/stop (wider aperture) makes the edge effect be less significant, less of the total light passing through is affected by the edge - whereas stopping it down makes diffraction much more significant (much more edge effect to total area). It absolutely is 100% caused by the lens aperture. Not sure I would name it an aberration, as much as a property... that is, it cannot be corrected, Wider aperture is better though, in this one property. When a photo lens test report shows the measured resolution dropping off the more it is stopped down, what do you imagine causes that? :) When a smaller telescope has less theoretical resolution (larger Airy Disk) than a larger one, why do you imagine that is? Greater diffraction is why that is. It has nothing to do with the sensor. [/QUOTE]

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