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Auto Focus Teleconverter

Auto Focus Teleconverter
Auto Focus Teleconverter

are these tele converters or something else?

I have an old minolta 7000 that was given to me. I am not experienced with old or minolta cameras. the camera came with three objects that i believed to be teleconverters. but when mounted on my camera with a lens the auto focus goes endlessly. so i try to manually focus and it never clears into an image. the only markings on any of them is there size, 31mm,21mm, and 13mm. the 31mm also says M/AF but i am assuming that stands for manual and auto focus like normal. another thing is that they don't have any lenses in them. I have only used one Item a long time ago that i believed was a teleconverter, but not one hundred percent sure. anyways, it had at least one lens in it. does anyone know what I am dealing with. if they are teleconverters, what am i doing wrong.

They are probably extension tubes used to enable a lens to focus closer to the subject.

Teleconverters have a lens in them and are usually notated with a figure like 1.4x, 1.7x or 2x.

Autofocus Canon 70-200 F/8 with 2x Kenko Pro 300 DG C-AF Teleconverter with 3 pins taped on TC

Sigma AF Zoom 70-300mm f / 4.0-5.6 DG Macro Motorized Lens With 2X Auto focus Tele-Converter (140-600mm) , Set of 3 Filters , Case , Cleaning kit , Cap Holder , Lens Hood , Two Years Extended warranty For Nikon D40 D40X D50 D60 D70 D80 D90 D100 D200 D300 D3000 D5000 D300S (works with auto focus)
Sigma AF Zoom 70-300mm f / 4.0-5.6 DG Macro Motorized Lens With 2X Auto focus Tele-Converter (140-600mm) , Set of 3 Filters , Case , Cleaning kit , Cap Holder , Lens Hood , Two Years Extended warranty For Nikon D40 D40X D50 D60 D70 D80 D90 D100 D200 D300 D3000 D5000 D300S (works with auto focus)
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Kenko 2X Teleplus - 7 Element DG for Canon Auto Focus Digital SLRs
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Kenko 2X Teleplus - 4 Element DG Auto Focus for Nikon-AF Digital SLRs
Kenko 2X Teleplus - 4 Element DG Auto Focus for Nikon-AF Digital SLRs
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Tamron AF 18-270mm F/3.5-6.3 Di II VC (Vibration Compensation) LD Aspherical (IF) Macro Zoom Lens KIT With 2X AF Tele-Converter (36-540mm auto-Focus) , set of 3 filters , Case , Hood , Cleaning kit , Cap Holder and extended warranty For all NIKON Digital SLR cameras .
Tamron AF 18-270mm F/3.5-6.3 Di II VC (Vibration Compensation) LD Aspherical (IF) Macro Zoom Lens KIT With 2X AF Tele-Converter (36-540mm auto-Focus) , set of 3 filters , Case , Hood , Cleaning kit , Cap Holder and extended warranty For all NIKON Digital SLR cameras .
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Canon Zoom EF 75-300mm f / 4.5-5.6 Telephoto Lens With 2X Auto-Focus Tele-Converter (150-600mm) , Lens Hood ,Lens pouch , 2 Years Ext warranty , Lens Cleaning Kit , Lens Cap holder , Set of 3 High Resolution Filters (UV , Circ Polarize , FLD) For all Canon Digital SLR Cameras
Canon Zoom EF 75-300mm f / 4.5-5.6 Telephoto Lens With 2X Auto-Focus Tele-Converter (150-600mm) , Lens Hood ,Lens pouch , 2 Years Ext warranty , Lens Cleaning Kit , Lens Cap holder , Set of 3 High Resolution Filters (UV , Circ Polarize , FLD) For all Canon Digital SLR Cameras
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Tamron AF 18-270mm F/3.5-6.3 Di II VC (Vibration Compensation) LD Aspherical (IF) Macro Zoom Lens KIT With 2X AF Tele-Converter (36-540mm auto-Focus) , set of 3 filters , Case , Hood , Cleaning kit , Cap Holder and extended warranty For all CANON Digital SLR cameras .
Tamron AF 18-270mm F/3.5-6.3 Di II VC (Vibration Compensation) LD Aspherical (IF) Macro Zoom Lens KIT With 2X AF Tele-Converter (36-540mm auto-Focus) , set of 3 filters , Case , Hood , Cleaning kit , Cap Holder and extended warranty For all CANON Digital SLR cameras .
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Sigma 50-500mm f/4.5-6.3 APO DG OS Optical Stabilizer HSM SLD Ultra Telephoto Zoom Lens Kit for Canon Digital DSLR Camera With 2X Auto focus Tele-Converter 100-1000mm , set Of 3 Filters , Case , Hood , Cleaning kit , Cap Keeper and Extended warranty
Sigma 50-500mm f/4.5-6.3 APO DG OS Optical Stabilizer HSM SLD Ultra Telephoto Zoom Lens Kit for Canon Digital DSLR Camera With 2X Auto focus Tele-Converter 100-1000mm , set Of 3 Filters , Case , Hood , Cleaning kit , Cap Keeper and Extended warranty
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Sigma AF Zoom 70-300mm f / 4.0-5.6 DG Macro Pro Lens Kit with 2X Auto focus Tele-converter (140-600mm) , set of 3 filters , case , Hood , cleaning kit , cap holder and Two Years Extended Warranty For Canon XSI , XS , XT , XTI , T1I , T2I , 20d, 30D , 40D , 50D , 7D
Sigma AF Zoom 70-300mm f / 4.0-5.6 DG Macro Pro Lens Kit with 2X Auto focus Tele-converter (140-600mm) , set of 3 filters , case , Hood , cleaning kit , cap holder and Two Years Extended Warranty For Canon XSI , XS , XT , XTI , T1I , T2I , 20d, 30D , 40D , 50D , 7D
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Canon Zoom 75-300mm USM (Ultra Sonic Motor) III f / 4.5-5.6 Telephoto Lens With 2X Auto-Focus Tele-Converter (150-600mm) , Lens Hood ,Lens pouch , 2 Years Ext warranty , Lens Cleaning Kit , Lens Cap holder , Set of 3 High Resolution Filters (UV , Circ Polarize , FLD) For all Canon Digital SLR Cameras
Canon Zoom 75-300mm USM (Ultra Sonic Motor) III f / 4.5-5.6 Telephoto Lens With 2X Auto-Focus Tele-Converter (150-600mm) , Lens Hood ,Lens pouch , 2 Years Ext warranty , Lens Cleaning Kit , Lens Cap holder , Set of 3 High Resolution Filters (UV , Circ Polarize , FLD) For all Canon Digital SLR Cameras
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Sigma AF Zoom 70-300mm f / 4.0-5.6 DG Macro Pro Lens Kit with 2X Auto focus Tele-converter (140-600mm)set of 3 filters , case , Hood , cleaning kit , cap holder and Two Years Extended Warranty For Pentax K10D , K20D , K100 , K200 , KX , K7
Sigma AF Zoom 70-300mm f / 4.0-5.6 DG Macro Pro Lens Kit with 2X Auto focus Tele-converter (140-600mm)set of 3 filters , case , Hood , cleaning kit , cap holder and Two Years Extended Warranty For Pentax K10D , K20D , K100 , K200 , KX , K7
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