Are Teleconverters a Con?

[Alan C]

All teleconverters degrade the image to some extent, 2x more than 1.4x. 
In film & 6Mp days cropping wasn't really an option so they did give 
more reach without the expense of a longer lens. Long ago I had an M42 
Vivitar 2x which made my SuperTak 55/2 a useful 110/4. Given a high 
quality TC and a fast host lens, good results are possible. However with 
the high Mp sensors now in common use, a cropped image without the TC 
may be just as good or even better so what is the point? Only perhaps 
cropping options of the TC image which starts with full Mp?

Alan C
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