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Old September 12th, 2012, 02:41 PM
isldgl's Avatar
isldgl isldgl is offline
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Help please on resolving this photo issue...

Any help on this dilemma would be greatly appreciated. I am using a Canon 20D with a 17-85mm lens. I have attached a Hoya UV filter and a polarizer lens also. Notice the original image, how I have the edging of the filters showing in all four corners of the photo, when zoomed out all the way.

Is the only way around this problem is to zoom in a bit before shooting? I have also noticed this edging showing up even with just the UV filter on...Any suggestions? Thank you for taking the time to view this.

This is the original:



This is my cropped version:

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Old September 12th, 2012, 03:17 PM
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Nikon_Mario Nikon_Mario is offline
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Re: Help please on resolving this photo issue...

@ 17mm you will probably not be able to avoid the vignetting, especially with both filters on. If you are using a polarizer filter, then you can take the UV filter off. This might help a bit. Also, don't know what kind of filter you are using but there are some low profile filters built for some of the wider angle lenses. These might be more expensive but could be something to look for. Though sometimes the vignetting just can't be avoided at the widest setting.
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Old September 12th, 2012, 03:19 PM
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jaharris1001 jaharris1001 is offline
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Re: Help please on resolving this photo issue...

yep, thats a typical problem with vignetting from your filter, especially noticeable at wide angles, if you have a polarizer on your lens, I would take off the UV filter, just use the polarizer, that will help ,, they sell "thin mount" filters that help with that,, I use a Canon 10-22 UWA lens and a thin mount Singh Ray filter which helps me eliminate that problem LOLOL I just noticed Mario told you basically the same exact thing I did LOL yep,, you dont need the UV filter especially since you have the polarizer on there, so get rid of that for now,, you can either zoom in a bit or fix it in your post processing,, which Ive done MANY times
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Old September 12th, 2012, 03:29 PM
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Re: Help please on resolving this photo issue...

Both Mario and Jim covered all options available. At least that I am aware of.
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Old September 12th, 2012, 04:53 PM
Russ Russ is offline
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Re: Help please on resolving this photo issue...

The 1st thing I did after I received filters for my 20D and lenses (including the 17-85) was to test for vignetting: without any filters, w/ UV only, w/ CPL only, and w/ both*. I tested lenses at shortest and greatest focal lengths (if zooms) and at nearest focus and infinity. I was using slim or thin rimmed frames for the CPL's and found no noticeable vignetting over that present with no filters.....except in the extreme case of stacking 2 filters. As a general rule, you should never stack a CPL atop another filter....there is no advantage and several potential disadvantages. To do so is just being lazy. I can (and have) made exceptions when I'm in hostile environs and want to add a polarizer without exposing the naked lens by removing the UV or protective filter.

Given the relatively small amount of vignetting from stacking both filters, I'll assume with one OR the other you'll have no vignetting.

Re the vignetting with the UV filter, take a shot of the northern sky (blue) with NO filters and compare it with using either filters (but not both simultaneously). There MAY be a certain amount of vignetting with no filters.....you're looking for ADDITIONAL vignetting caused by filters or lens hood. Again, shoot widest aperture, near & far focus (manually) as that extends the lens where you'll most probably get vignetting if it exists.
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Old September 12th, 2012, 05:29 PM
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isldgl isldgl is offline
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Recent Photo: Water Fountain
Re: Help please on resolving this photo issue...

@JesseHD, Nikon_Mario...Thank you so much for all your help! I really appreciate it a lot!

@Jaharris...lol...it's the thought that counts! I appreciate it nonetheless! Thank you!

I will try those suggestions and see what happens today. Going outside right now...hehehe to test!

@Russ--Great tip on testing using the sky...I suppose that is when I notice it the most in shots that have the sky...Thank you!
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