Pro DSLR Video Tips, Sigma's new 50-500mm Lens Tested and more

DSLR Video Tips from David Harry Stewart	View this email online

	July 15, 2010 Breaking news from America's top photo magazines From the Forums: A Question about Canon's EOS 7D Our readers share their thoughts. Join and Contribute!

	DSLR Video Tips from David Harry Stewart Let a pro tell you how to get the most out of your HDSLR. Lens Test: Sigma 50-500mm F/4.5-6.3 APO DG OS HSM Bigma has lost some weight and gained features. DIY iPhone DSLR One crafty DIY-er is trying to get his Canon EF lenses to play nice with his iPhone American Photo's Images of the Year Contest Enter now for a chance to win.   Photo of the Day Think your photos have what it takes to be named Photo of the Day? Then upload your best shots to our Flickr page. See the whole gallery here Tip of the Week Question: Do UV or circular polrizing filters cause zoomed images to be blurred? I have done some unscientific testing using my Pentax K10D with Sigma 70-200mm f/2.8 II APO EX DG Macro lens and UV or circular polarizing filters. pictuers taken at maximum zoom are blurry if I use either of the filters, but they're significantly clearer with the bare lens. Is this result normal? Answer: What your tests revealed is that, with filters, quality matters. Cheap glass, poor flatness and inadequate coatings can cause image degradation. That's why we recommend only the top name-brand filters. Of course, they cost more, but you get what you pay for. Got a question? E-mail us at PopPhoto@bonniercorp.com. Also, visit the Tech Support forum at forums.popphoto.com.

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