Limited Offers on Hidef Telephoto Below
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 58mm 58 TELEPHOTO 2x LENS Converter FOR ALL DIGITAL FILM SLR  US $19.93
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 HI DEF WIDE ANGLE TELEPHOTO LENS SONY HDR SR8 HDR SR7 US $24.95
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 BOWER 2X X2 TELE LENS FOR Af 5 DX Zoom Nikkor 18 135MM US $59.95
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 Hi Def 2X 58mm Telephoto Lens Black Canon Sony Fuji US $11.79
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 Pro Hi Def 72mm 2x Telephoto Lens For Sony HDR FX1 US $49.99
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 37mm Pro Lens Kit for Sony HC3 HC7 HC9 SR11 SR12 CX12 US $149.95
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 HD Wide Angle 3X Lens Kit for Canon T1i T2i 1V 60D XS US $109.95
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 HD Wide Angle 3X Lens Kit for Nikon D40 D3000 D5000 US $99.95
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 HD Wide Angle 3X Lens Kit for Olympus E 450 e 520 620 US $99.95
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 HD Wide Angle 3X Lens Kit for Panasonic FZ28 FZ18 FZ8 US $99.95
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 HD Wide Angle 3X Lens Kit for Pentax KX K200D K2000 US $109.95
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 HDWide Angle 3X Lens Kit for Sony DSC F828 H5 H2 F717 US $109.95
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 Wide Angle 3X Lens Kit for Canon XTi XSi T1i T2i 50D US $99.95
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 Wide Angle 3X Lens Kit for Nikon D3000 D5000 18 55mm US $99.95
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 Wide Angle 3X Lens Kit for Olympus E 420 E 520 E 300 US $99.95
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 Wide Angle 3X Lens Kit for Panasonic DMC FZ35 FZ100 US $99.95
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 Wide Angle 3X Lens Kit for Pentax K20D K200d K2000 K7 US $99.95
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 Wide Angle 3X Lens Kit for Sony DSC F828 H5 H2 F717 H US $99.95
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 77mm 72mm HiDef Conversion Wide Angle MacroTelephoto Lens for D SLR Cameras US $112.89
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 Merkury Optics 3x HiDef Telephoto lens US $49.99
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 2X TELECONVERTER LENS FOR Olympus E 1 E300 E330 E 500 US $19.93
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 2X Tele Extender for 58mm Canon EOS 350D 400D Rebel US $19.93
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 2X TeleConverter Lens FOR Canon TC DC58D Powershot G10 US $19.93
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 58 mm 58mm 2X Tele Lens for CANON EOS REBEL XTi XT XSi US $19.93
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 58mm Telephoto Lens 2x for SONY DSC H2 H1 H5 PD150 US $19.93
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 58mm 2X Telephoto Lens for Sony DSC F828 DSC H2 H5 US $19.93
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 2x X2 Telephoto Lens 58mm For Canon EOS 500D Rebel T1i US $19.93
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 58mm Tele 2X Telephoto ScrewOn Lens for Nikon D40D50 US $19.93
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 3X LENS KIT FOR NIKON D7000 D31000 D3000 D5000 18 55mm US $99.95
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 NEW HD 3X Lens Kit for Pentax K5 K7 Kr KX 18 55mm US $99.95
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 NEW PRO 3X Lens Kit for Canon T3i T3 T2i XT 1V 60D US $99.95
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 NEW PRO 3X Lenses FOR SAMSUNG NEX 10 NEX 11 NEX 100 US $99.95
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 NEW PRO LENS 3X KIT for OLYMPUS E 5 E 30 E 620 US $99.95
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 TRIPOD LENS Kit for Nikon D3100 D7000 18 55MM US $99.95
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 TRIPOD LENS KIT FOR SAMSUNG NEX 10 NEX 11 NEX 100 US $99.95
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 TRIPOD LENSES KIT for Canon T3i T3 T2i XT 1V 60D US $99.95
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 Wide Angle 3X Lens Kit for Canon T3i T3 T2i XT 1V 60D US $99.95
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 Wide Angle 3X Lens Kit for Nikon D3100 D7000 18 55MM US $99.95
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 Wide Angle 3X Lens Kit for Nikon D40 D40x D3000 D5000 US $99.95
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 Wide Angle 3X Lens KIT for OLYMPUS E 5 E 30 E 620 US $99.95
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 Wide Angle 3X Lens Kit for Pentax K20D K200D K2000 KX US $99.95
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 Wide Angle 3X Lens Kit for Pentax K5 K7 Kr KX 18 55mm US $99.95
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 Wide Angle 3X Lenses for Canon HF G10 S30 XF100 XF105 US $99.95
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 Wide Angle 3X Lenses for Canon T3i T3 T2i XT 1V 60D US $99.95
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 Wide Angle 3X Lenses for OLYMPUS E 5 E 30 E 620 US $99.95
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 Wide Angle 3X Lenses SAMSUNG NEX 10 NEX 11 NEX 100 US $99.95
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 Wide Angle 3X Lensesfor Pentax K5 K7 Kr KX 18 55mm US $99.95
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 Wide Angle 3X Lens Kit for Canon XTi XS XSi T1i 50D US $99.95
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 Wide Angle 3X Lens Kit for Pentax K20D K200D K2000 US $99.95
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 WIDE ANGLE TELE LENS KIT FOR Canon VIXIA HF20HF200 US $34.95
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 BOWER 2X TELEPHOTO LENS FOR Fuji S100fs US $59.95
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 WIDE ANGLE TELE LENS KIT 34mm FOR Hitachi DZ GX5080A US $34.95
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 HD 72mm 2X X2 Teleconverter Telephoto Pro tele Lens AF US $59.95
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 BOWER HD HiDef 72mm 2x x2 Telephoto Tele Video Lens NEW US $59.95
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 72MM TELEPHOTO TEL 2X LENS FOR PANASONIC DVX100B DVX100 US $54.95
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 58mm 2X Tele Lens for CANON EOS REBEL XTi XT XSi 58 US $19.93
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 58mm 2X Tele Converter Lens for Canon XM2 GL1 GL2 new US $19.93
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 72MM 2X TELEPHOTO LENS FOR PANASONIC AG DVX100 AG DVC80 US $59.95
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 2X TeleConverter Lens FOR 58mm Sony DCR VX2100VX2100E US $19.93
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 58 mm 58mm 2X Tele Lens for Canon Pentax Sony Nikon US $19.93
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 72mm 2X HD TELEPHOTO LENS FOR PANASONIC DVX100B DVX100 US $59.95
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 72mm Wide Angle Hi Def 45x Lens Fit Canon XL2 XL1s XL1 US $59.84
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 PRO HIDEF 22X TELEPHOTO LENS FOR SONY DSC R1 67MM NEW US $58.95
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 Wide Angle 3X Lens Kit for Canon XT XTi XS XSi 50D 5D US $109.95
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 Wide Angle 3X Lens Kit for Olympus E 410 E 510 E 500 US $109.95
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 BOWER 2X X2 TELEPHOTO TELE 62MM for Sony HDRFX7HVR V1U US $62.95
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 72MM TELEPHOTO TEL 2X LENS FOR CANON XL2 XL H1 XH G1 A1 US $54.95
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 WIDE ANGLE TELEPHOTO LENS FOR SONY HDR SR12 HDR SR8 US $39.95
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 2X Telephoto Lens FOR 58mm CANON S2IS S3IS S5IS G7 G9 US $19.93
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 WIDE ANGLE 2x TELEPHOTO LENS FOR JVC Everio GZ HD620 US $34.95
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 BOWER 2X TELEPHOTO LENS FOR SONY HDR FX1 HDRFX1 HVR Z1 US $54.95
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 BOWER 2X TELEPHOTO LENS 67mm FOR Canon EOS 40D Camera US $59.95
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 BOWER 2X X2 TELEPHOTO LENS 67mm FOR Nikon D80 D70 D70s US $59.95
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 2x x2 TELEPHOTO TELE LENS FOR PENTAX K10D K110D K100D US $19.93
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 Hi Def HD 2X Telephoto Lens For Fuji S5500 S5100 S5000 US $29.00
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 BOWER HD 67mm 2X Telephoto Lens Pro FOR SONY DSC R1 NEW US $59.95
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 BOWER Hi D TELEPHOTO TELE 2X LENS 72MM FOR SONY HDR FX1 US $54.95
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 DigiPro 2X Tele Lens 37mm HiDef Sony Droid Free Ship US $49.95
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 2X TELE ZOOM LENS FOR Canon EOS Rebel XT lens 18 55 mm US $19.93
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 Hi DEF 2X Telephoto 045X Wide Lens FR Panasonic FZ40 US $29.99
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 36X HIDEF TELEPHOTO LENS 52MM 55MM 58MM US $59.99
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 2x Telephoto Lens for Fuji FinePix S3100 S3000 Hi Def US $29.00
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 2x HD2 Telephoto Lens For Sony DSC F828 DSC F717 F707 US $19.93
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 Hi DEF 2X Telephoto 05X Wide Lens Olympus E300 E330 US $28.99
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 FishEye Wide Angle Lens for Canon EOS Cameras new US $35.00
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D40 Telephoto lens help?
Hey guys I need some help. I have a Nikon D40 with 2 lens. The normal 55mm that comes with it and a 200mm zoom lens. Now I've been looking around on ebay for a cheaper way to extend my zoom on my 200mm (Here's the 200mm lens I mentioned http://www.argos.co.uk/static/Product/partNumber/5700628/Trail/searchtext%3ENIKON.htm )
Anyway i have found this on Ebay
http://cgi.ebay.co.uk/3X-HIDEF-TELEPHOTO-TELE-LENS-FOR-Nikon-D60-D80-D40-D40X_W0QQitemZ360178450845QQcmdZViewItemQQptZCamera_Lenses?hash=item53dc4f019d&_trksid=p3286.c0.m14
And i was drawn in by the price. However not knowing too much about cameras I was hoping someone could give me some advice about this. Really I just want to know if it would work with my lenses and if so how much of an improvement would it be?
Thanks for you help 
I wouldn't recommend it. That's what you call a teleconverter.
http://en.wikipedia.org/wiki/Teleconverter
It gives a lens more reach, but in the process you lose significant image quality with all but the best lenses, and several stops of aperture. Most teleconverters will confuse the autofocus system, which leads to only using Manual Focus.
RAYNOX DCR-2025PRO HD Telephoto conversion lens 2.2x_B