diffraction
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From: egbert_no_bacon on 21 Dec 2009 19:03 what is diffraction, and do you have an example or know where an image of such is posted for me to see please
From: Better Info on 21 Dec 2009 19:11 On Mon, 21 Dec 2009 16:03:24 -0800 (PST), egbert_no_bacon <egbert_no_bacon(a)hotmail.co.uk> wrote: >what is diffraction, and do you have an example or know where an image >of such is posted for me to see please In order for diffraction effects to become visible and apparent, they'd have to have diffraction-limited optics. Few if any DSLR glass owners possess such equipment. If their lenses show poorer performance at any wider apertures then that glass is not diffraction-limited. The only thing they will ever be able to show is how poorly their glass is figured at all apertures.
From: Jeff R. on 21 Dec 2009 19:26 "egbert_no_bacon" <egbert_no_bacon(a)hotmail.co.uk> wrote in message news:59ce6c6d-8b34-48f3-aaea-04e69a04302a(a)v30g2000yqm.googlegroups.com... > what is diffraction, and do you have an example or know where an image > of such is posted for me to see please Here is one of mine from a few years ago: http://www.mendosus.com/armidale/uralla.jpg Nikon D50, f/22, 8 seconds, 24-120 zoom set at 24mm. Two frames poorly merged (but that doesn't matter). -- Jeff R.
From: egbert_no_bacon on 21 Dec 2009 19:57 On Dec 22, 12:26 am, "Jeff R." <cont...(a)this.ng> wrote: > "egbert_no_bacon" <egbert_no_ba...(a)hotmail.co.uk> wrote in message > > news:59ce6c6d-8b34-48f3-aaea-04e69a04302a(a)v30g2000yqm.googlegroups.com... > > > what is diffraction, and do you have an example or know where an image > > of such is posted for me to see please > > Here is one of mine from a few years ago:http://www.mendosus.com/armidale/uralla.jpg > > Nikon D50, f/22, 8 seconds, 24-120 zoom set at 24mm. > Two frames poorly merged (but that doesn't matter). > > -- > Jeff R. am i looking for here, what i would call 'air dust bubbles' in daylight shots but 'light refection' as if a mirage, is this diffraction i thank you
From: Jeff R. on 21 Dec 2009 20:05 egbert_no_bacon wrote: > On Dec 22, 12:26 am, "Jeff R." <cont...(a)this.ng> wrote: >> "egbert_no_bacon" <egbert_no_ba...(a)hotmail.co.uk> wrote in message >> >> news:59ce6c6d-8b34-48f3-aaea-04e69a04302a(a)v30g2000yqm.googlegroups.com... >> >> > what is diffraction, and do you have an example or know where an >> > image of such is posted for me to see please >> >> Here is one of mine from a few years >> ago:http://www.mendosus.com/armidale/uralla.jpg >> >> Nikon D50, f/22, 8 seconds, 24-120 zoom set at 24mm. >> Two frames poorly merged (but that doesn't matter). >> >> -- >> Jeff R. > > am i looking for here, what i would call 'air dust bubbles' in > daylight shots but 'light refection' as if a mirage, is this > diffraction > > i thank you You are looking for the "spikes" radiating from the lights. Not visible at wide apertures (this one was f/22). The general softening caused by diffraction is not obvious here. -- Jeff R.
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