Airy Disks

RobertP · 04-11-2005, 21:01

Bit quiet here so I've been looking at some of my bookmarks.

This Site was one I chanced upon. No idea where I got it from - but anyway.... there is some fascinating stuff there.

Edit: think it may have been from a thread about monitor calibration here some time.

If I am reading this page right, images on the 20D will degrade above f11 due to diffraction. Airy disks sound like frisbees but define where this diffraction will come in and become visible.
Other sensor pixel densities will have the same problem but at different apertures.
So as your lens gets sharper with a smaller aperture your sensor starts to work against you because of diffraction

Can't see it amounts to much in real world use of the camera... but it's interesting stuff.

Oh and there are some items about sensor noise for SammyC too.

Anyone else got a good bookmark to share for the long evenings?

Bachs · 04-11-2005, 21:19

Couldn't choose so I did a partial backup of my bookmarks under favourites/photography/tutorials and uploaded it here
Help yerselves!

RobertP · 04-11-2005, 21:29

Too much information!

Appreciate the spirit in which it is given but I'd not get through that lot in a whole winter

noah · 04-11-2005, 22:24

some good stuff in ther bachs, thanks

might have a look through mine.

Bachs · 05-11-2005, 07:00

Quote:

Originally Posted by RobertP

Too much information!

Appreciate the spirit in which it is given but I'd not get through that lot in a whole winter

The spirit in which it was given was called Glenmorange.
If I had have been sober, I would have just posted a couple :icon_cool

***Dave*** · 05-11-2005, 08:31

Great bookmarks guys.....I've bookmarked the bookmarks

**Sonsey** · 05-11-2005, 08:33

Some really helpful links there folks, cheers

Matty · 05-11-2005, 09:18

good stuff, should add some of those links to the links section later!

04-11-2005, 21:01	#1 (permalink)
RobertP Forum Regular Join Date: Sep 2005 Location: Woodford Essex Posts: 841	Airy Disks Bit quiet here so I've been looking at some of my bookmarks. This Site was one I chanced upon. No idea where I got it from - but anyway.... there is some fascinating stuff there. Edit: think it may have been from a thread about monitor calibration here some time. If I am reading this page right, images on the 20D will degrade above f11 due to diffraction. Airy disks sound like frisbees but define where this diffraction will come in and become visible. Other sensor pixel densities will have the same problem but at different apertures. So as your lens gets sharper with a smaller aperture your sensor starts to work against you because of diffraction Can't see it amounts to much in real world use of the camera... but it's interesting stuff. Oh and there are some items about sensor noise for SammyC too. Anyone else got a good bookmark to share for the long evenings? __________________ 20D. Kit lens. Canon 50mm 1.4. Sigma 150mm 2.8 macro. Tamron 28-75 XR Di. Canon 70-200 f4L . Canon 100-400L. 580EX. Last edited by RobertP : 04-11-2005 at 21:15.

05-11-2005, 08:33	#7 (permalink)
Sonsey Pixalo Crew Join Date: Oct 2005 Location: N. Ireland Posts: 7,242	Some really helpful links there folks, cheers Last edited by Sonsey : 05-11-2005 at 08:36.

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04-11-2005, 21:19	#2 (permalink)
Bachs Forum Regular Join Date: Jul 2005 Location: Montrose NE Scotland Posts: 919	Couldn't choose so I did a partial backup of my bookmarks under favourites/photography/tutorials and uploaded it here Help yerselves!

04-11-2005, 21:29	#3 (permalink)
RobertP Forum Regular Join Date: Sep 2005 Location: Woodford Essex Posts: 841	Too much information! Appreciate the spirit in which it is given but I'd not get through that lot in a whole winter

04-11-2005, 22:24	#4 (permalink)
noah Been here a while Join Date: Sep 2005 Location: cardiff and bristol Posts: 414	some good stuff in ther bachs, thanks might have a look through mine.

05-11-2005, 08:31	#6 (permalink)
*Dave* Pixalo Crew Join Date: Jul 2005 Posts: 14,902	Great bookmarks guys.....I've bookmarked the bookmarks

05-11-2005, 09:18	#8 (permalink)
Matty Member Join Date: Jan 2005 Location: kings hill Posts: 5,269	good stuff, should add some of those links to the links section later!