norm_havens

<p>Gerry>>Is it true that the teleconverter can only be used with this lens. If so, I wonder why...<br> It's also supposed to be usable on the phantom 300mm f4. Why? I suppose in order to save space (or possibly optical necessity), the front element of the tc protrudes into the back element of the main lens, something doable only with lenses that have that open space.</p>