Chromatic aberration
Jan 17, 2012 15:48:31 #
RMM wrote:
Yes, I have shot in raw purposely to see if it helped any and to see if it made any difference in lightroom as for as the chromatic aberration tools were concerned. There was little if no difference. I'm thinking it is the lens because when I back it way off, the problem does not exist. However, even without pushing the lens, let's say 250mm @ f8, I still notice it a little bit. I have a Carl Zeiss 50mm lens and if I push that one too hard. I can see it just a wee bit, but not enough to annoy me. I think a better quality glass would relieve my stress. Lol.Have you tried shooting in RAW? And have you tried a reset to factory defaults? I'm wondering if the camera is introducing the aberration in the process of converting to JPEG.
Jan 17, 2012 16:08:45 #
tainkc wrote:
Yes, I have shot in raw purposely to see if it hel... (show quote)
I found this comment in a review at:
http://www.photoreview.com.au/Sony/reviews/cameraaccessories/sony-sal75300-75300mm-f4556-zoom-lens.aspx
Some purple/green fringing was found in shots of high-contrast subjects taken in bright lighting with the longest focal length settings. Red/cyan fringing was more common with the 75mm focal length. However, for most shots, this problem was seldom apparent. The illustrations below provide examples from both ends of the focal length range.
This might well be your problem. You just need your birds to reduce their contrast with the surrounding environment. Maybe you should start shooting chameleons instead.
Jan 17, 2012 17:41:07 #
RMM wrote:
LOL. Hey, by the way, thank you very much for the link. It was profoundly interesting for me. I have the Sony a580 which uses the same sensor as the a55. This is good when comparing apples to apples. I have the cheaper version of this lens. I probably should have saved up, huh? quote=tainkc Yes, I have shot in raw purposely to... (show quote)
I am usually very meticulous when doing my research. I wonder how I missed this review? I can not thank you enough for the time and effort you put in to help me. I hope that sometime I may be able to do the same for some one else. Again, thank you from my core.
Tom
Jan 17, 2012 18:12:04 #
Ragarm wrote:
Sorry about getting back to you so late. Boy! Do I know about compression algorithms. That is another subject. Anyway. this lens is giving me fits because, even when not pushed to the limit, fringing is apparent on several photos that are not enlarged. I am going to contact Sony and see what they think. It could be just this lens. Thank you for your help.Also, I notice your images are in JPEG. All compre... (show quote)
Jan 17, 2012 22:41:40 #
Jan 17, 2012 23:34:15 #
English_Wolf wrote:
No. They are just cropped this way.You shoot at this small size?????????
Jan 18, 2012 10:36:31 #
Jan 18, 2012 11:33:42 #
English_Wolf wrote:
alright, fine. Lol. Nothing done to this one at all.Original = un-cropped....
straight from camera.
Jan 18, 2012 14:35:38 #
tainkc wrote:
English_Wolf wrote:
alright, fine. Lol. Nothing done to this one at all.Original = un-cropped....
My guess is that at the level of magnification you'd use to crop in and blow up on the bird, the lens is working as described in the review: Chromatic aberration in areas of high contrast.
Jan 18, 2012 15:03:37 #
RMM wrote:
My guess is that at the level of magnification you'd use to crop in and blow up on the bird, the lens is working as described in the review: Chromatic aberration in areas of high contrast.
Yeah, I think that you right.tainkc wrote:
English_Wolf wrote:
alright, fine. Lol. Nothing done to this one at all.Original = un-cropped....
My guess is that at the level of magnification you'd use to crop in and blow up on the bird, the lens is working as described in the review: Chromatic aberration in areas of high contrast.
Jan 18, 2012 15:11:13 #
RMM wrote:
I have the same results in RAW. I am pretty close to the factory defaults as is. I don't have this problem with any of my other lenses. I did use this same lens on my post titled, " A doe from yesterday". The light wasn't the greatest and I had to shoot slower, but I did not see this problem. I had it before with this lens while photographing deer. Oh, well.Have you tried shooting in RAW? And have you tried a reset to factory defaults? I'm wondering if the camera is introducing the aberration in the process of converting to JPEG.
http://www.uglyhedgehog.com/t-21634-1.html
Jan 18, 2012 15:23:09 #
Jan 18, 2012 16:01:20 #
Did not find anything significant on the web over your situation.
Looking at your original I did not see any chromatic aberration either (other than the bird itself). This is possibly due the high contrast BUT when I look at the branches that are also in high contrast areas I cannot find it!!!
I did find something that may not appear to be related to your trouble but you'll be the judge of that. http://www.flickr.com/groups/1525626@N25/discuss/72157628611169591/
Looking at your original I did not see any chromatic aberration either (other than the bird itself). This is possibly due the high contrast BUT when I look at the branches that are also in high contrast areas I cannot find it!!!
I did find something that may not appear to be related to your trouble but you'll be the judge of that. http://www.flickr.com/groups/1525626@N25/discuss/72157628611169591/
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