Teleconverter

[haunteddoc]

Ok, stupid question, but what happens to the speed of a telephoto lens, or any lens for that matter, when you add say a 2X teleconverter. Is the speed halved?

 

[Tim]

you lose two f/stops worth of exposure. ie. a 2x tele at f/4 is really f/8 for shutter speed. so really your shutter speed is reduced to 1/4 of what it would have been.

ie. 1/1000sec at f/4 = 1/500sec at f/5.6 = 1/250sec at f/8

SO....you need a lot of light to use a TC unless it's on a fast lens (ie. f/2.8 or so)

 

[Roger]

And only one stop with a 1.4x.

Got some great shots this week with the 70-200 + 1.4tc. I have too many to go through right now, so it's going to take some time to get them online.