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Hi! I was thinking about a way to save money, and get a faster lens. I am wondering, will a tamron 1.4x extender work with a Canon 100mm f/2 lens? Wouldn't this mean that I could then have a 140mm f/2.8 lens, which could replace a need for the 135mm?
will it make a good 140/2.8 ? probably . will it make a replacement for a 135L ? No way
having used TC's on various lenses for a test I will concur that there is no such thing as a free lunch.
a 1.4x will not normally do too much to IQ as in general the results are pretty good, but you do usually get a more 'nervous' bokeh . also sometimes you may find you have to stop down a tiny bit. so you can think of it more as 140/4