Which teleconverter?

Started Feb 13, 2013 | Questions thread
calson Veteran Member • Posts: 8,506
Re: Which teleconverter?

With an f4 maxium aperture lens you will have fewer problems with the 1.4x TC that only takes your lens to a f5.6 maximum aperture lens. At f5.6 the autofocus performance will suffer but not intolerably. The 1.7x turns your lens into a f6.3 zoom and the 2x turns it into a f8 max aperture lens which is very limiting.

A 600mm f8 lens is going to require a fast shutter speed for the 600mm and a high ISO to compensate for the f8 maximum aperture. With the 2x TC there is also more of a chance of refraction showing up at smaller apertures.

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