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12/02/2005 06:17:28 PM · #1 |
Hi,
A couple of months ago a photographer I met suggested I buy the Quantaray AF 70-300mm 1:4-5.6 ld tele-macro 1:2 lens for my new digital rebel xt (my first dslr). He said it was a great lens for the price $159 and made by Sigma. Problem is I keep getting purple fringing, even when I try to watch for my light source. Is there any way I can avoid this when the shot is taken as it is getting very frustrating!!! Alot of shots ruined and I don't think my software - Photoshop Elements 3.0 can fix it afterwards. Any advice? Or is the lens no good?
Thanks for any help:) |
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12/02/2005 06:18:38 PM · #2 |
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12/02/2005 06:19:19 PM · #3 |
they put special lens coatings on digital class lenses now to avoid such, you get what you pay for I guess. This would probably be a fine lens for 35mm film, but not really great.
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12/02/2005 06:19:35 PM · #4 |
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12/02/2005 06:20:59 PM · #5 |
I do wonder if placing a UV or Polarizing filter helps reduce fringing, but you lose 2 stops of light. Don't have any direct knowledg eon that question.
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12/02/2005 06:28:49 PM · #6 |
I have the Nikon version of that lens and haven't had any problems with purple fringe. I do run into lots of problems with the AF though either not locking on or thinking it's locked and then getting a soft picture.
Is it possible you got a defective lens? Do you ever have the problem with any other lenses? |
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12/02/2005 06:30:09 PM · #7 |
THis is a crop of the original - no flash that I can remember, and no sun that day. I didn't have a UV filter on - can you belive I did buy one but lost it. This shot was rejected at a stock site for the purple fringing along the top of the snow to the left of the photo. Don't know if you can see it or not with this example. |
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12/02/2005 06:33:03 PM · #8 |
I also have problems with many of the photos either being soft or blurry (even with a tripod). THe only good shots I got were on a tripod and using the timer, even then I don't know if they were that good. Or could it be my skill level is causing the fringing?
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12/02/2005 06:33:58 PM · #9 |
I can see it..its not that bad...I have some on my pictures...
The top of the wings and the back wing...I had a UV filter on my lens..
I don't understand this myself...maybe somebody can help both of us..!
Message edited by author 2005-12-02 18:34:40. |
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12/02/2005 06:38:50 PM · #10 |
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12/02/2005 06:44:33 PM · #11 |
Originally posted by BJ:
That's a great shot:) |
THANK YOU! I work 3 days on this red tail hawk...everyday after work! I was going to enter it in the Free study but changed my picture on the 29th..the picture I entered took 5 mins..isn't that funny! |
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12/02/2005 06:47:07 PM · #12 |
If you shoot RAW, and have a proper RAW editing solution, some of this fringing may be removed, or at least less noticed.
Converting the image to black and white makes purple disappear as well.
:-P |
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12/02/2005 06:51:01 PM · #13 |
UV filter is of no use in this situation. It's an integral property of the lens/sensor combination. There is software that will eliminate or reduce the fringing. I have seen it talked about, but I've never used it and I don't have offhand specific links to offer.
Robt. |
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12/02/2005 06:53:24 PM · #14 |
I tried out the trial version of ulead photoimpact 11 and it had a fringe remover filter/action. It would remove fringing of different colors, purple, yellow, blue and so on. it worked pretty well
James |
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12/02/2005 06:54:07 PM · #15 |
| Do the more expensive lenses have the same problem? |
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12/02/2005 06:55:01 PM · #16 |
| Do you know how much the program is or where I could get it? |
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12/02/2005 06:56:52 PM · #17 |
Originally posted by BJ:
Do the more expensive lenses have the same problem? |
The problem is typically less obvious with better-designed and built lenses.
R. |
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12/02/2005 06:59:01 PM · #18 |
| Paint Shop Pro X has a purple fringe fix if that helps at all :) |
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12/02/2005 07:02:28 PM · #19 |
| hmm..that is interesting..I wonder..did you look up the reviews on the lens? Might want to try that and see what you can find. |
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12/02/2005 07:06:26 PM · #20 |
| No, I didn't check into it by reading reviews - that is a good suggestion. I should have not been so quick to buy a lens since my budget is extremely limited and now this will have to be it for a while! I guess I got over excited because he was raving about it and it was something I could afford at the time so I ran right out and got it - either way, it is a good lesson for future purchases:) |
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12/02/2005 07:06:27 PM · #21 |
Originally posted by BJ:
Do you know how much the program is or where I could get it? |
Adobe Photoshop CS, $300 student edition |
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12/03/2005 03:46:53 AM · #22 |
Originally posted by maxj:
Originally posted by BJ:
Do you know how much the program is or where I could get it? |
Adobe Photoshop CS, $300 student edition |
Before you drop $300 or $600 on Photoshop, download the free trial version of Paint Shop Pro X. I'll bet it will satisify your needs, and if you decide to buy it you'll only be out $99. It includes RAW Shooter Essentials so you won't need anything else if you want to shoot in RAW.
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12/03/2005 08:31:46 AM · #23 |
I had some fringing problems with my Sigma 17-35. To solve it, I often went in and played with desat using a tight selection. Magenta and blue usually fix it. Its the cheapest way that works in a pinch if there isn't too much. The other choice is black and white as suggested before.
quick edit, now I would go in and do a little cloning to get the blue grey tones around the snow right.
Message edited by author 2005-12-03 08:33:10.
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12/03/2005 09:55:27 AM · #24 |
could also use the $300 or $600 for Photoshop, trade in the 160$lens
& get a good piece of glass ... which will focus faster & more accurate as well ...
only lens i own that has that much CA is the fisheye & it is mainly on the edges ....
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12/03/2005 06:36:44 PM · #25 |
Hi,
Just wanted to thank everyone for all the info and help- I really appreciate it!
Bj |
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