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DPChallenge Forums >> Hardware and Software >> Filter question
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02/21/2006 12:57:29 PM · #1
Well, since deciding on what lenses (Tamron SP 24-135 and Sigma 100-300, wide lens will wait) to get. I need to know more about filters. If there is a site I could read about it I'd appreciate the link. Otherwise, here's my question. I have a pretty general idea of what each filter does. My question is...which to get and is 1 brand really better than the next? The Tamron uses 72mm and the Sigma uses 82mm which doesn't help monetarily, but oh well.
1. UV Filter is a must
2. Polarizing filter - these I see come in varying degrees. How can I determine which is right for me?
3. Neutral Density Filter - not sure what this one is for?
I've read this thread. Any help would be greatly appreciated.
My primary shooting would be outdoor sports, hopefully on a 65 degree sunny day (wish they could all be like that).
02/21/2006 01:16:53 PM · #2
If you're going to get a UV filter (the camps are split as to whether or not it's worth it) make sure you get a good one since they do in fact degrade image quality.

For a polarizing filter, go with a multicoated one...Hoya or B&W are the better ones. You don't need ultra slim or pro or whatever...Hoya HMC is fine...don't know about B&W stuff.

Neutral density filters cut the light evenly so you can slap it on and reduce the shutter speed (great for getting silky water). If your camera has a crop you can get step down rings and buy cheaper filters (I have a Tamron 19-35 that takes 77mm filters but on my 20d I can step it down to 58mm with no vignetting).
02/21/2006 03:23:47 PM · #3
As cresus mentioned, there are basically two camps regarding UV/Haze filters.

Here's an interesting read regarding the subject: //www.luminous-landscape.com/columns/sm-feb-05.shtml

Polarizer: if you're going to be shooting outdoors, can definitely be helpful. This is probably the most popular filter. Any circular polarizer should be fine. Personally, I went with cheap, but not cheapest...I also didn't feel I needed to spend extra for the best 'pro' CPL.

02/21/2006 03:32:49 PM · #4
Originally posted by tsheets:

Here's an interesting read regarding the subject: //www.luminous-landscape.com/columns/sm-feb-05.shtml

Polarizer: if you're going to be shooting outdoors, can definitely be helpful. This is probably the most popular filter. Any circular polarizer should be fine. Personally, I went with cheap, but not cheapest...I also didn't feel I needed to spend extra for the best 'pro' CPL.

Interesting article. Makes perfect sense though. Thanks.
Edited for spelling

Message edited by author 2006-02-21 15:33:39.
02/21/2006 03:41:31 PM · #5
Regarding that luminous landscape article, I would have preferred to see the same shot with the filter taken off to see if that flare/ghosting was gone. I've often taken shots with bright lights without a filter b/c of concen about flares and got flares anyway on my Tamron 17-35, even with the hood on.
02/21/2006 04:41:28 PM · #6
I agree, yido. I thought the same thing. I want to see the difference visually in an article like that. But, it was an interesting read, anyway. I'm not convinced 100% either way at this point.

02/21/2006 05:40:30 PM · #7
I've seen a lot of shots where sharpness and contrast drastically changed with filter on and off. You're always going to have flare with cheap UV filters but flare isn't really what I was talking about with respect to the UV filter. Mainly that you're going to lose what people love in their expensive lenses...contrast and sharpness.

So I've stopped using UV filters.
02/21/2006 05:54:53 PM · #8
Hmmm,
This test of real world images using none, cheap, and expensive UV filters on a 70-200L IS lens is pretty good.
//www.pbase.com/fstopjojo/uvtest
I'd be interested in what folks have to say.

The only time I've seen filters affect my shots are flares when shooting timed exposures in the dark, where a bright light causes flares. I've see them in the LCD when I chimp, so I started to take the filters off and they were gone. Maybe I should have saved those images.
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