Light loss with 1.4x vs 1.7x vs 2x teleconverter
Nikon Shooter wrote:
Uplander wrote: How come we haven't seen improvements to teleconverter performance over the years?
That begs for a very simple answer.
Because TC's are subject to optical physic laws and these cannot be
twisted in any way.
Uplander wrote: Manufactures are always improving lens and camera bodies, why no teleconverters?
Lens technologies will improve on many parameters like weight, size,
dispersion etc, etc, but only within the description of the said laws.
Right now today, with current technology we can't bend the physics involved. 
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