Teleconverter x2

Started Mar 7, 2017 | Questions thread
Douglas F Watt Veteran Member • Posts: 3,784
Re: Teleconverter x2

Sandy wrote:

Remember you lose 2 stops of light with a 2x TC. So, your f5.6 will become f11 and the lens will not autofocus. The usual limit on AF is f8.

I would caution against TCs in general unless you are using a high quality lens and a TC designed for it. I guess there are VERY few 2xTC and lens combos that actually work better then a crop of the image without the TC.

+1 on all that!  I might add that even with my best telephoto primes, I no longer really attempt to use the TC2.0, but will use the TC1.4 sometimes.  But again, only on the best primes.  Would not recommend using even those on many zooms.  May be a couple that are good enough.  But not many.

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