DeJur Auto 2X Teleconverter to suit canon

hello every buddy i do not no if this is the proper section for this but any one heard abut this teleconverter ?? is any good ? pleas any buddy Had any info abut at !

any on please ?

I've never heard of it.

But, a 2x TC on your Tamron 70-300 will do two things: #1, you'll lose autofocus, because the aperture at the long end will be a minimum of f/11. #2 - the image quality will not be good. Most zooms won't take a 2x TC very well...the only ones that do are the f/2.8 70-200 varieties usually. 2xTCs are best used for long primes, like the 300 f/2.8L or the 400 f/2.8L. Other than that, stick to 1.4x TCs. Even then, you'll need a faster telephoto lens to use a TC and still retain autofocus on your 400D.

he Jman13
thank you ........... so much that was helpful ? what you think did work with my new sigma 55-700 or with prime 50 !! any idea ??