800mm f/5.6...lighter than 600mm f/4....nice!

Started Jan 29, 2013 | Discussions thread
mattr Veteran Member • Posts: 3,527
Re: 800mm f/5.6...lighter than 600mm f/4....nice!

Leonard Shepherd wrote:

The inclusion of the special 1.25x teleconverter in the price to get presumably top optical quality at 1000 mm seems a smart move to me.

Yes, indeed.

The thing I don't understand is why they made it only 1.25x. A 1.4x would have made more sense, IMO. If the lens is as sharp as the MTFs indicate, even with a 1.4x TC it should still be easily good enough for the D800 sensor.

The cropping flexibility of current 36MP full frame sensors makes low magnification TCs pretty much unnecessary. With the D800, 1.25x magnification by cropping still results in a 23MP image.

Could it be that they had some concerns that autofocus at f/8 would be worse than at f/7.1?

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