The reason i ask is the digital filters description included this; " Digital Coated Glass - Reduces 'ghosting' / 'orbs' (reflections from DSLR's CCD)"
IMO a lot of that "digital coated" stuff is pure hype intended to separate you from your money, especially when its associated with no-name filters.
Buy a circular polarizer from Heliopan, B+W, Singh-Ray, Hoya or Tiffen and you'll be fine. If you will be using the polarizer on an extreme wide-angle lens (10-14mm, 12-20mm) then spend the extra money for a thin or slim mount polarizer to reduce the possibilities of vignetting - dark corners on your pictures.
If you have 2 or 3 lenses which take different size filters (67mm, 58mm, 55mm etc.) you can buy filters in the largest size and "step-up rings" such as a 55-67mm or whatever you need. Its usually safe to use a larger filter on a smaller lens but you should never use a smaller filter on a larger lenses. Again, vignetting will result.
Every lens you own should have it own protective UV/Haze filter in place at all times. Remove it only when using your polarizer. I have several lenses that are 30 to 35 years old and their front elements are in perfect condition because they have always been protected by a filter.
Savings Pkg Lens Accessory Kit for Canon EF-S 18-55mm, 58MM 3 Pcs UV CPL FLD Filter Kit with Hood + Cap + Keeper, Essential lens and filter kit for CANON EOS 400D 350D 300D 7D 60D, 58mm 3PC Filter Kit UV FLD CPL Polarizing + Accessory for Canon T3 T3i, Lens Hood+LCD Lens Pen+2x Screen Protector 3.4/1.8" For Canon EOS 50D, 58mm Flower Lens Hood+LCD Lens Pen+2x 3.3" LCD For Canon EOS Rebel XSi 450D, 49mm Snap On Lens Cap+Lens Pen+Gift For Sony NEX-5 NEX-3 NEX-5N NEX-C3 NEX-7, Hoya-HMC 55mm Lens Protect Kit f/ DT 18-55mm f/3.5-5.6, Lens Cleaning Pen Air Blower For Digital Camera/Laptop, Lens Cleaning Pen Air Blower For PDA/HTC/SAMSUNG/LG/SONY ERICSSON/NOKIA/HP, 58mm Wide 0.45x+Tele 2x+Flash+Filter set+Macro For Canon EOS 600d 1100d 7d D-slr, 0.45x WIDE+FLASH+TELE 2x+FILTER LENS SET For Sony Alpha 55mm A450 A550 A500 A850, Camera essentials kit for Olympus C730 adapter tube, 52mm 2x Telephoto + close up kit + UV CPL ND4 filter for Nikon D60 D5000 D5100, WIDE ANGLE TELE Lens Filter Accessory KIT FOR Canon EFS 18-55mm f/3.5-5.6 IS SLR, Hood+Macro-Set+Filter kit For Sigma 18-200mm f/3.5-6.3, Remote Control+Lens Hood+Filter Set For Canon EOS 60D Rebel T2i/T3i 5D Mark III, 58mm Haze Filter+Flower Lens Hood+Lens Cap+Brush For Canon EOS 60D 5D Mark III, For Nikon COOLPIX S4300 S3300 S4100 EN-EL19 Battery+Charger+Case+LCD+Lens PEN, 67mm EW-73B Camera Lens Hood+67mm Camera UV Filter+Snap On Lens Cap+Lens Pen, LI-50B Battery+HDMI+LCD Lens Pen for Olympus XZ-1 SP-800UZ TG-810 SZ-30MR SZ-10, For Canon EOS Rebel T2i / 550D 2x LP-E8 Battery+Charger+3x LCD+Lens Pen, For Sony WX10 NP-BG1 Battery+Charger+Lens Cleaning Pen+Mesh Case, For Canon EOS 7D 60D 5x 52mm Filter Set+Lens Hood+Cap Holder+Pen+Cleaning Cloth, For Canon EOS Rebel T1i 2x LP-E5 Battery+Charger+Lens Pen+3x LCD, For Canon EOS 60D Rebel T2i T3i T1i T3 XSi XS 58mm UV Filter+Lens Hood+LCD Pen, For Canon EOS Rebel XS 2x LP-E5 Battery+Charger+3x LCD+Lens PEN, UV+Close Up Filters+Lens Hood+Pen For 58mm Canon EOS 60D Rebel T2i T3i T1i T3, New WIDE+TELE+FLASH+MACRO+FILTER SET LENS FOR Sony A560 A580 A290 A390 55mm DSLR, 3in1 Lens Cleaning Pen Lenspen Kit For DSLR/SLR/VCR/DC, 2.2X HD TELE PHOTO WITH HARD LENS HOOD + FILTER KIT FOR NIKON D60 18-105MM, 67MM 2.2X HD PROFESSIONAL TELE LENS + HOOD FOR CANON 7D EF-S 18-135MM F/3.5-5.6, 2.2X TELE LENS ZOOM + FILTER KIT + HOOD FOR CANON 40D EF-S 18-135MM F/3.5-5.6, 67MM 2.2X TELEPHOTO LENS + HOOD + FILTER KIT UV CPL FLD FOR NIKON D5000 16-85MM, 2.2X Telephoto lens 72mm + lens adapter + UV CPL FLD filter kit for Sony DSC-HX1, 2x Tele+0.45x Wide+Flash+Macro+Filter kit For Pentax k-110d k-200d k-100d k-2000, New Wide Angle+Flash+Tele+ Filter lens Set For Nikon D7000 D3100 D5100 D3s D3000, 2x TELE+WIDE 0.45x+FLASH+MACRO+FILTER Kit For Sony Alpha A380 A330 A230 55mm SLR, Flash + tripod + UV CPL filter kit + adapter for Fujifilm S602 S4900 S6900, Essential Kit for Canon G11 G12 Includes: Wide Telephoto Close Up and Filter Kit, Essential Lens and Filter Kit for Canon G10 G11 G12, Telephoto + Soft Fisheye lens + Close up Set + Hood for Canon Rebel T3i T3 T2i, Essential Kit for Panasonic FZ28 FZ38 Includes 2X Tele + 0.43X Wide + UV CPL FLD, 0.45x Wide+Tele 2x +Flash+Macro+Filter Set For Nikon AF D3 D5000 D3000 D200 52mm, 52mm 2 Lens 3 Filter KIT POP UP Flash diffuser 18-55mm, VCCKIT FOR SONY A290 A390 A500 A33 WIDE ANGLE MACRO TELE LENS FILTERS KIT Hood +, VCCKit FOR Nikon D3100 D3000 D5100 D5000 Lens Filter Hood POP UP 18-55mm, 2X TELE + 0.45X WIDE ANGLE + UV CPL FLD FILTER KIT+POP UP FOR NIKON D5100 D3100, 2X Telephoto + 0.43X Wide Angle + UV CPL FLD Filter Kit for Canon G10 G11 G12, Telephoto + Wide Angle + Filter Kit + Close-Up Set + Hood for Canon, Essential Lens and Filter set for Canon SX1 SX10 SX20 IS, Essential Kit f/ Canon Rebel T3i T3 T2i
XTi XSi XS EOS 1100D 600D 550D 500D 450D, In-Camera Battery Power Charger AC Adapter Cord Cable for Kodak Easyshare V 1073, Wide Fisheye + Telephoto Zoom Lens + Close Up Set for Olympus E-620 E-510 E-450, Professional Lens Kit for Nikon D3200 D5100 D5000 D3100 D3000, Car In-Camera Battery Charger + AC Power Adapter Cord for Kodak Easyshare V 803, Essential kit for Canon Rebel T3i T3 T2i T2 T1i XTi XT XSi XS, 58 MM Elemental Lens and Filter kit for Canon T3i T3 600D 550D 18-55mm, Wide Angle + Telephoto + Filter Kit + Close up set for Nikon D3000 D5000 D7000, Professional Kit 0.43X 2X + Lens UV CPL + Close up Filter + Hood for Canon 5D 7D,
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