no nameJoe

Check with sigma they make a specific teleconverter for your lens with amount of your 7200

pmackd Loc: Alameda CA

The latest Kenko 1.4x TC will almost certainly work on both lenses. The Nikon TCs won't work on either lens. From my experience with similar lenses you will not be happy with the results with any TC on these lenses. As others have pointed out, TCs work best on high end lenses, particularly primes. I can tell you that the Nikon TC14 III works well on my Nikon 300mm f4 VR PF without stopping down. On my Nikon 200-500 it's better to stop down to f10 or f11. In your situation I would take the advice of another member who commented, skip the TC, stop down to f8 and crop.

East Banana

Any time anyone suggest placing something extra between my sensor and the subject, I will lose IQ ....the first thing I use to accomplish this fact is a lens


There is absolutely nothing to gain by addition in Photography, providing a reason serves no purpose other than to self serve my own vanity

For something to gain it requires the borrowing from something, for every gain there is a loss somewhere

Even a UV filter degrades IQ for that matter




"Is not mathematical analysis just a vain game of the mind anyway?"

Henri Poincare on the Reality of Reality in Physics

bull drink water Loc: pontiac mi.

with the lens you mention, you will loose light and auto focus. there are third party converters that wil work with that lens. if you can borrow or rent the converters you can give them a shake down and see if they deliver for you.

PeterBergh

Digression: Even a vain game of mind may have some value. Einstein would have had much more difficulty formulating his general theory of relativity, had not Riemann developed Riemannian geometry, specifically the curvature tensor, some fifty years earlier. At Riemann's time, his geometry was a "vain game of the mind".

Einstein's general-relativity equation relates the curvature tensor of spacetime to the mass-energy tensor.