17th March 2004, 03:20 PM
21st March 2004, 08:02 PM
You will need to take note of the few stop drop when using 2x convertor before buying it
For instance for Canon 2x :
EF300mm f2.8L -> 600mm f5.6
EF300mm f4 -> 600mm f8
22nd March 2004, 03:49 PM
Beside loss of light, 2x TCs will also cause loss in image quality. It depends on you whether you can trade the image quality for the reach. A 1.4x TC seems imposes very minimum quality loss. Check the image output from various combination and ask advice from those who're using the lens you planed to buy.
23rd March 2004, 03:04 PM
Thanks chrisleng, will this f-stop reduce be indicating on the metering? Or I have to compensate it by myself?
Originally Posted by chrisleng
Thanks a lot for your explanation.