seems odd that the Nikon teleconverters don't work; have Nikon phased them out or likely to be updating them (if you have a crystal ball or direct line ex officio Andy). I was thinking the same, though having just got the first decent pic off with ancient 70-300 AF 1:4-5.6 G my son threw out my way, it gives me more thinking time

Similar story with the Canon TC - it only works on a few of the Canon lens (will not work with the Canon 75-300 for instance). This is done on purpose as Canon do not allow it to fit lenses that do not do a tc justice. Guess it is probably the same with Nikon.

Thanks Andy. :)

Chris,

Its all down to design. I have neither the 18-200 or the TC-14E II but if you check the lens construction images at the bottom of the page on each of these links, you can see that there would be a clash of elements between the lens and the converter. :eek:

http://nikonimaging.com/global/produ...g_if/index.htm
http://nikonimaging.com/global/produ...4e_2/index.htm

On the Kenko converter the design is such that the front element of the converter is 8mm inside the mounting flange. Whether that 8mm is sufficient clearence I do not know.

The other factor to be taken into account is aperture. In Thom Hogans review effective aperture falls off quite sharply, f4.8 by 50mm, so adding a tc will have an effect on the ability of the lens to satisfactorily auto focus. Link to Thom Hogans review http://www.bythom.com/18200lens.htm

Don

any thoughts on Nikkor 80-400? I know it is a bit old, but considering how rude Ken Rockwell and other reviewers sometimes are, they seem to be hunting for faults except slow AF on moving objects, but am quite happy to go only for 'chilling birds'. Also about my limit for price/weight.