Just wanted to get something of my chest
it seems that Teleconverters, especially the 2x or more variants get an extremly bad rap. I was somewhat nervous when i got my kenko 2x TC and expected horribly soft images of doom.
But as ive slowly but surely seen its not quite as bad as its being said.
Yes the images loose somesharpness and sometimes arent that contrastfull, but this is easily remedied to more than acceptable levels in Photoshop.
Furthermore id much rather have a very slightly soft image, than no image.
So to all those unsure of wether to get a TC or not here are some tips:
1. They have a steep learnign curve, your first few images definately wont be as good, but youll get the knack of it soon
2. While i mentally aknowledged the 2 stops light loss i failed to take into consideration a very important thing, this made it much harder for me to get keepers at first.
Simply upping up the iso to comensate for the lower light isnt enough, you have to take into consideration that the focal length has now increased. So while for example a 1/200 iso 100 f/2.8 with 2 light stops alone would be fine at 1/200 iso 400 f/5.6, you now have a focal length of 400mm, so you need at least 1/400 or else camera shake will creep it and make your images soft.
Here are some shots taken with a 40D, a 70-200 2.8 is usm and a kenko 2x TC and imho it could be much worse and the bad rep is slightly exxagerated:
just my 0.02$