Photographing birds in flight
2b. I know the 30D can follow soaring birds and keep focus. (Take a
look at: Sorry to follow up on my own post. In response to people who have asked, I've posted some close-ups on: http://www.posted-online.com/ArizonaBirds/Page1.html and http://www.posted-online.com/ArizonaBirds/Page2.html and moved the other pages, so the owl- and hawk-series pages are now: http://www.posted-online.com/ArizonaBirds/Page3.html and http://www.posted-online.com/ArizonaBirds/Page4.html BTW, for a good reason NOT to use JPEG, take a look at the bottom picture on http://www.posted-online.com/ArizonaBirds/Page1.html ( http://posted-online.com/ArizonaBirds/pix/14.jpg - 100K ). Notice the blue hues around the green leaves. There was no blue in the original picture. Sigh. -Joel |
Photographing birds in flight
Dr. Joel M. Hoffman wrote:
2b. I know the 30D can follow soaring birds and keep focus. (Take a look at: Sorry to follow up on my own post. In response to people who have asked, I've posted some close-ups on: http://www.posted-online.com/ArizonaBirds/Page1.html and http://www.posted-online.com/ArizonaBirds/Page2.html and moved the other pages, so the owl- and hawk-series pages are now: http://www.posted-online.com/ArizonaBirds/Page3.html and http://www.posted-online.com/ArizonaBirds/Page4.html BTW, for a good reason NOT to use JPEG, take a look at the bottom picture on http://www.posted-online.com/ArizonaBirds/Page1.html ( http://posted-online.com/ArizonaBirds/pix/14.jpg - 100K ). Notice the blue hues around the green leaves. There was no blue in the original picture. Sigh. Nice shots but I don't know why a jpeg would produce those blues... that doesn't sound right? |
Photographing birds in flight
On Sat, 07 Apr 2007 18:23:11 GMT, Paul Furman wrote:
( http://posted-online.com/ArizonaBirds/pix/14.jpg - 100K ). Notice the blue hues around the green leaves. There was no blue in the original picture. Sigh. Nice shots but I don't know why a jpeg would produce those blues... that doesn't sound right? I don't think it's a jpeg produced artifact. You often get color fringing when objects have an intensely bright background, such as the sky, and better lenses produce less of it. The blue in this shot is probably so easily noticed because it covers a greater area due to being considerably out of focus. I've noticed CA having several different colors, sometimes blue, sometimes purple, yellow or orange. The glossary entry (link below) mentions that CA often increases when a lens is used at its widest, and that the commonly noticed "purple fringing" is probably more due to the sensor's microlenses than a result of the lens's design. http://www.dpreview.com/learn/?/Glos...rration_01.htm |
Photographing birds in flight
Ed Ruf (REPLY to E-MAIL IN SIG!) wrote:
On Sat, 07 Apr 2007 18:23:11 GMT, in rec.photo.digital Paul Furman wrote: Dr. Joel M. Hoffman wrote: ( http://posted-online.com/ArizonaBirds/pix/14.jpg - 100K ). Notice the blue hues around the green leaves. There was no blue in the original picture. Sigh. Nice shots but I don't know why a jpeg would produce those blues... that doesn't sound right? I've seen something similar , even in raw files from a D70 processed by RSE. Probably a bit of bloomimg/CA? I'll conject it's the blue sky, un-overexposed by diminution of intensity by the palm-frond filter. Similar effect: Overexposed out of the direct sun, greater color saturation under the shade of the pier. http://www.fototime.com/8D5F43553123D59/orig.jpg -- Frank ess |
Photographing birds in flight
"Ed Ruf (REPLY to E-MAIL IN SIG!)" wrote in message ... : On Sat, 07 Apr 2007 18:23:11 GMT, in rec.photo.digital Paul Furman : wrote: : : Dr. Joel M. Hoffman wrote: : : ( http://posted-online.com/ArizonaBirds/pix/14.jpg - 100K ). Notice : the blue hues around the green leaves. There was no blue in the : original picture. Sigh. : : Nice shots but I don't know why a jpeg would produce those blues... that : doesn't sound right? : : I've seen something similar , even in raw files from a D70 processed by : RSE. Probably a bit of bloomimg/CA? : -- : Ed Ruf ) : http://edwardgruf.com/Digital_Photog...ral/index.html I can get that effect with 5D if I use a cheap, long lens wide open and the foliage is backlit.I always thought it was Chromatic Aberration. Just out of focus like the rest of the area. |
Photographing birds in flight
: ( http://posted-online.com/ArizonaBirds/pix/14.jpg - 100K ). Notice
: the blue hues around the green leaves. There was no blue in the : original picture. Sigh. I can get that effect with 5D if I use a cheap, long lens wide open and the foliage is backlit.I always thought it was Chromatic Aberration. Just out of focus like the rest of the area. Hmm. It's with the Canon 17-85 IS USM (f/8, 1/640, ISO 500), not a great lens, but not a cheap one, either. A long time ago someone posted a digital way of eliminating or reducing CA, but I've lost the link. My guess is that whatever digital magic does this won't work with out-of-focus CA, but I'd be curious to find out. If someone has access to this anti-CA filter, feel free to play around with the image and post what you learn.... -Joel ---------------------------------------------------------------------------- EXIF data for any image or web page: http://exif.posted-online.com ---------------------------------------------------------------------------- |
Photographing birds in flight
"Dr. Joel M. Hoffman" wrote in message ... :: ( http://posted-online.com/ArizonaBirds/pix/14.jpg - 100K ). Notice : : the blue hues around the green leaves. There was no blue in the : : original picture. Sigh. : : I can get that effect with 5D if I use a cheap, long lens wide open and the : foliage is backlit.I always thought it was Chromatic Aberration. Just out of : focus like the rest of the area. : : Hmm. It's with the Canon 17-85 IS USM (f/8, 1/640, ISO 500), not a : great lens, but not a cheap one, either. : : A long time ago someone posted a digital way of eliminating or : reducing CA, but I've lost the link. My guess is that whatever : digital magic does this won't work with out-of-focus CA, but I'd be : curious to find out. If someone has access to this anti-CA filter, : feel free to play around with the image and post what you learn.... : : -Joel : : ---------------------------------------------------------------------------- : EXIF data for any image or web page: http://exif.posted-online.com : ---------------------------------------------------------------------------- : Look for "Flo's tools" This Frenchman has produced a really nice set of very useful tools which are camera make independent, they just need a PS compatible program to use as a host. |
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