Teleconverter x2

Started Mar 7, 2017 | Questions thread
Sandy Senior Member • Posts: 2,157
Re: Teleconverter x2

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.

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