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<blockquote data-quote="WayneF" data-source="post: 136940" data-attributes="member: 12496">Not at all familiar with it, but you said built in aperture, whatever that is.&nbsp; It would be hard to believe much of a camera would not have adjustable f/stop - but I suppose you just mean a fixed non-adjustable aperture.&nbsp; &nbsp;&nbsp; Brownie box cameras were like that.&nbsp;&nbsp; Nevertheless, that lens had a diameter, adjustable or not, so there was diffraction there, caused by it.All optical lenses have a diameter, and thus they have an aperture. It may not be adjustable, but they definitely all have a computed f/stop number for that aperture.&nbsp;&nbsp; Mirror lenses for example.&nbsp; They say f/8 or something.&nbsp; They have a diameter, which causes diffraction.Even Telescopes, same thing.&nbsp; It may not be adjustable, but their diameter is the aperture.&nbsp; If you want to discuss it, you ought go read up on this first. Start here:&nbsp; <a href="http://en.wikipedia.org/wiki/Airy_disk" target="_blank">http://en.wikipedia.org/wiki/Airy_disk</a></blockquote>

[QUOTE="WayneF, post: 136940, member: 12496"] Not at all familiar with it, but you said built in aperture, whatever that is. It would be hard to believe much of a camera would not have adjustable f/stop - but I suppose you just mean a fixed non-adjustable aperture. Brownie box cameras were like that. Nevertheless, that lens had a diameter, adjustable or not, so there was diffraction there, caused by it. All optical lenses have a diameter, and thus they have an aperture. It may not be adjustable, but they definitely all have a computed f/stop number for that aperture. Mirror lenses for example. They say f/8 or something. They have a diameter, which causes diffraction. Even Telescopes, same thing. It may not be adjustable, but their diameter is the aperture. If you want to discuss it, you ought go read up on this first. Start here: [URL]http://en.wikipedia.org/wiki/Airy_disk[/URL] [/QUOTE]

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