3rd Party AF Teleconverters For Canon EF - Canon EOS Technoclopedia

Model1
Amazon
 Compatibility2 F-Stops Diameter (mm) Length (mm) Weight (g) Produced Notes Tests & Reviews
B.I.G. C-AF DG 1.4x Auto Teleconverter (4LMC)               26 (?) 135 (?)      
B.I.G. C-AF DG 2x Auto Teleconverter (4LMC)               26 (?) 135 (?)      
Bower MC 2x Tele-Converter [SX4EOS/SX4DGC]                   the DGC series is newer and provides "superior DHD resolution"  
Bower MC7 2x Tele-Converter [SX7EOS/SX7DGC]       Limited to EF     43 160   the DGC series is newer and provides "superior DHD resolution"  
Cambron MC 1.4x Pro           +1 66.5 18.8        
Cambron MC 2x C/AF1           +2            
I.R.Vision MC 2x C/AF Tele Converter         Limited to EF +2 66.5 26        
Jessop MC 2x C-AF Tele-Converter                        
Jessop 2x C-AF DG Tele-Converter                        
Jessop DGII 2x C-AF Tele-Converter                        
Kalimar 1.7x AF         Limited to EF              
Kenko Teleplus AF 1.4x DGX (4LMC)   Limited to EF +1 66 25 110 2009 corrected focal length and aperture reported to the camera and in the EXIFs; works with lenses up to f/?; AF compatibility problems with 2007's EOS bodies (incl. 1D III, 1Ds III and 40D) and EF 50mm F1.8 (II?)  
Kenko Teleplus AF 1.5x SHQ         Limited to EF +1   17.5 111   electronic transmissions are limited resulting in better AF behavior (see Traumflieger comparisons) AF should work properly up to F4.5 Traumflieger: Big 1.4-1.7x Extender test (german)
Kenko Teleplus AF 1.5x DG         Limited to EF +1   18 110   electronic transmissions are limited resulting in better AF behavior (see Traumflieger comparisons) AF should work properly up to F4.5 Traumflieger: Big 1.4-1.7x Extender test (german)
Kenko Teleplus AF 2x MC4         Yes, all (EF-S?) +2   25.4 136      
Kenko Teleplus AF 2x MC4 DG         Limited to EF +2 68.6 25.4 135   upgraded gate-array IC circuitry  
Kenko Teleplus AF 2x MC4 DGX     Limited to EF +2 68.6 26.0 111 2010 upgraded gate-array IC circuitry  
Kenko Teleplus AF 2x MC7         Yes, all (EF-S?) +2   35.7 170      
Kenko Teleplus AF 2x MC7 DG         Limited to EF +2   35.7 170   upgraded gate-array IC circuitry; works with lenses up to F4.0  
Kenko Teleplus AF 2x MC7 DGX     Limited to EF +2 67 35.8 157 2009 corrected focal length and aperture reported to the camera and in the EXIFs; works with lenses up to F4.0; AF compatibility problems with 2007's EOS bodies (incl. 1D III, 1Ds III and 40D) and EF 50mm F1.8 (II?)  
Kenko Teleplus HD 1.4x DGX         Yes, all +1 68 25 110 2015 3 elements in 2 groups; updated circuitry to record EXIF data more accurately (equivalent aperture and focal length of lens and teleconverter); glass elements are produced by Hoya  
Kenko Teleplus HD 2x DGX         Yes, all +2 68 35.8 157 2015 5 elements in 3 groups; updated circuitry to record EXIF data more accurately (equivalent aperture and focal length of lens and teleconverter); glass elements are produced by Hoya  
Kenko Teleplus HDpro 1.4x DGX           +1 68 19.4 128 2019 5/4 construction; replaces the Pro 300 models, feat. improved optics and coatings  
Kenko Teleplus HDpro 2x DGX           +2 68 39.9 180 2019 7/5 construction; replaces the Pro 300 models, feat. improved optics and coatings  
Kenko Teleplus Pro 300 DG AF 1.4x (5LMC) Snapshots of Kenko Teleplus Pro 300 AF 1.4x     Limited to EF +1 67.4 27 132   AF does not work properly above F4.0 with lenses that have 10 electronic contacts, see Traumflieger and below Traumflieger: Big 1.4-1.7x Extender test (german)
Kenko Teleplus Pro 300 DGX AF 1.4x (5LMC)   Limited to EF +1 67.4 27 132 2009 - 2019 corrected focal length and aperture reported to the camera and in the EXIFs; works with lenses up to F4.0; AF compatibility problems with 2007's EOS bodies (incl. 1D III, 1Ds III and 40D) and EF 50mm F1.8 (II?)  
Kenko Teleplus Pro 300 DG AF 2x (7LMC)         Limited to EF +2 68.3 51 184   Kenko states AF works up to F2.8 lenses, but in fact it does not (see Traumflieger, Epinions lists Canon EF 2.8/50 & 2.8/100 non-USM macro and 1.8/85 USM & 4/300 IS USM lenses that will MF only) Traumflieger: EF Extender 2x II vs. Kenko Pro 300 2x (german)
Kenko Teleplus Pro 300 DGX AF 2x (7LMC)     Limited to EF +2 68.3 51 184 2009 - 2019 corrected focal length and aperture reported to the camera and in the EXIFs; works with lenses up to F4.0; AF compatibility problems with 2007's EOS bodies (incl. 1D III, 1Ds III and 40D) and EF 50mm F1.8 (II?)  
Kenko Teleplus Pro 300 AF 3x     Limited to EF +3 68.3 65 194 2001 MF only due to high F-Stop impact  
Kepcor Tele-Converter MC 2x C/AF                     seen with Tele Plus caps (Kenko rebadged?)  
Phoenix AF 2x         Yes, all             Traumflieger: Big 1.4-1.7x Extender test (german)
Phoenix AF 2x C/D7 [#09763]       Yes, all              
Promaster AF 1.4x Digital         +1   19.4 133.2      
Promaster Spectrum 7 AF 1.7x           +1.5   25.4 114      
Promaster Spectrum 7 AF 2x Tele-Converter         +2   26 128      
Promaster Spectrum 7 AF 2x Digital           +2   43.5 184   has extra coating on the back end lens  
ProOptic Tele Converter AF 1.4x                   marketed by Adorama.com  
ProOptic Tele Converter AF 2x                     marketed by Adorama.com  
Quantaray Teleconverter 2x AF           68.6 45.2        
Sakar Tele Converter MC 2x C-AF           +2            
Sigma Tele-Converter EX APO 1.4x [823]       No D-SLR (?)   68 20.1 143   optimized for the 70-200mm F2.8 EX & EX DG lenses; they all use 10pin electronic coupling;
also work with 180mm F3.5 Macro, 300mm F2.8, 500mm F4.5 and 800mm F5.6 EX HSM /EX DG HSM lenses,
with both 80-400mm F4.5-5.6 EX OS /EX DG OS and with the 100-300mm F4.0, 120-300mm F2.8 and 300-800mm F5.6 EX HSM /EX DG HSM /DG OS HSM S lenses,
finally at least the DG versions also work with 50-150mm F2.8 DC EX* and 50-500mm F4.0-6.3 EX DG HSM,
and with both the 150mm F2.8 EX DG Macros; plugging in the wrong lens might damage the lens as well as the converter;
*Brenner Foto claims, they are not compatible with EF-S and DX lenses though		  
Sigma Tele-Converter EX APO 2x [875]       No D-SLR (?)   68 45.3 234    
Sigma Tele-Converter EX DG APO 1.4x [824]   Yes, all*   68 20.1 143 2005 SLRgear
Sigma Tele-Converter EX DG APO 2x [876]   Yes, all*   68 45.3 234 2005  
Sigma Tele Converter 1.4x TC-1401 [879]         Limited to Global
Vision series lenses*		   69.8 25 190 2014 *120-300mm F2.8 DG OS HSM | S requires a firmware update for compatibility; 7/5 construction; AF works up to F8.0  
Sigma Tele Converter 2x TC-2001 [870]           69.8 48.9 290 2014 *120-300mm F2.8 DG OS HSM | S requires a firmware update for compatibility; 10/5 construction; AF works up to F8.0  
Soligor Tele-Converter AF 1.7x C/D4         Limited to EF     19 170   AF works up to F4.5 Traumflieger: Big 1.4-1.7x Extender test (german)
Soligor Tele-Converter AF 2x C/D7         Limited to EF     36 175   AF works up to F4.5  
Soligor Tele-Converter AF 1.4x DG Pro         Limited to EF     27 132   optimized for 100mm and more; AF works up to F5.6  
Soligor Tele-Converter AF 2x DG Pro         Limited to EF     51 184   optimized for 100mm and more; AF works up to F4.0  
Soligor Tele-Converter AF 3x DG Pro         Limited to EF     65 194   optimized for 100mm and more; AF works up to F2.8  
Tamron Teleconverter AF 1.4x MC4 [AF14C-700]       Yes, all   68.6 19        
Tamron Teleconverter AF 2x [AF20C-700]       Yes, all   68.6 26        
Tamron Teleconverter SP AF Pro 1.4x [AF14PC-700]       Yes, all   68.6 19.3 132      
Tamron Teleconverter SP AF Pro 2x [AF20PC-700]         Yes, all   68.6 43.4 184      
Tamron Tele Converter 1.4x [TC-X14]       see comments   70 21.4 205 ann. in 09.2016 dust and moisture resistant; exclusively designed to fit the Tamron AF 150-600mm F5.0-6.3 SP DI VC USD G2, more compatible lenses might follow  
Tamron Tele Converter 2x [TC-X20]       see comments   69.8 53.6 360 ann. in 09.2016  
Tokina Doubler AF2x 7C RMC               40.6 199      
Viltrox Extender EF 1.4x       72 28 190   7 elements  
Viltrox C-AF 2x Teleplus       68 51 154   7 elements  
Vivitar 1.4x C/AF Tele Converter                     4 elements; AF works up to F5.6  
Vivitar 2x Auto Focus Teleconverter         Limited to EF           4 elements; AF works up to F4.5 ("Multicoated 4-Element C/AF" ?)  
Vivitar 2x Auto Focus Teleconverter Series 1         Yes, all         2000 7 elements, higher quality; AF works up to F4.5  
Vivitar 2xMC4 AF [Viv-2x4-C]               2009 4 elements; AF works up to F4.5; has a red ring around its tube; sold with Lifetime Warranty  
Vivitar 2xMC7 AF [Viv-2x7-C]                 2009 7 elements, higher quality; AF works up to F4.5; looks exactly like the old Series 1 converter, just different labeling; sold with Lifetime Warranty  
Vivitar Series 1 | 1.4x AF (or 1.4x Tele Converter)                      
Vivitar Series 1 | 2xMC7 AF                        
YongNuo YN C-AF 2x Teleconverter DGX             68   180   7 elements  
YongNuo YN C-AF 2x Teleconverter II             68   180 2013 7 elements; improved circuit, glass, coating and compatibility (EF 70-200mm F2.8L IS II, EF 70-200mm F2.8L IS II USM)  

General Notes:
1.) For Canon EF Extenders be referred to Still Lenses C/EF > Canon EF > Accessories.
   
Footnotes:
1 The difference between C/D4, MC4 or SX4 and C/D7, MC7 or SX7 converters is the number of elements used, e.g. MC4 = 4 elements, MC7 = 7 elements. The 7 element converters are the better ones (might not proof true in cross comparison between manufacturers).
2 Limited to EF means not compatible to EF-S.