Hi Stan. I suppose that the 1.4 extender you used with your 50-135 is the new HD 1.4 converter. If that's the case, how do you find the resulting IQ and focusing speed of the HD 1.4x + 50-135mm combo? I am mulling the purchase of that converter to use it mainly with the mentioned lens and your first hand experience report would be very valuable.

Carlos

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