The Canon extenders x1.4 and x2 (both,second versions,not the latest) I tried to install on this lens don't fit due to a construction detail.
Since I don't have nothing else on hand to try and test,what other extenders (brands) can be used with the 70-300 VC and how drastically they "kneal" the lens' IQ?
60D,MKIIn,Ds MKIII __EF 50 f/1.4,EF 100 f/2.8 macro,EF 135 f/2.0L,EF 16-35 f/2.8 L II,Tamron 28-75 f/2.8,EF 70-200 f/2.8L,Tamron 70-300 f/4-5.6 VC USD ,EF 2xII TC__Marumi clear glass,UV,ND & CPL__ Kata bags__Speedlite 580EX & Metz 58 AF-2 w/Eneloops__ Sandisk __Vanguard Alta Pro 263AT & TRACKER AP-364 w/SBH-300's