Can I use a Kenko teleconverter with my D5500 and Tamron SP AF 70-300mm f/4-5.6 VC USD lens? Terry Vick, via email
Jason says... Most 70-300mm telephoto zooms can’t be used with teleconverters, because the rear lens element isn’t recessed and fouls on the protruding front element of the teleconverter. The Tamron 70-300mm is an exception and can be used with a Kenko 1.4x or 2x teleconverter. There’s likely to be some degradation in sharpness but the major catch is that with a 1.4x or 2x teleconverter, the widest available aperture at 300mm is reduced to f/8 or f/11 respectively. In both cases, autofocus becomes impossible on the D5500, which doesn’t support autofocus with f/8 lenses. You’ll also find that you’ll need bright lighting to enable sufficiently fast shutter speeds, unless you massively increase your ISO setting.
The Kenko Teleplus PRO 300 DGX 1.4x and 2.0x teleconverters are best used with a ‘faster’ Tamron telephoto lens, like the 70-200mm f/2.8