The 355mm G Claron covers 12x20, so I have no idea why you would write that you "... went for the apo symmar because I wanted to eventually upgrade to 11x14 in the future..."
Originally Posted by johnielvis
The Claron weighs over half a kilo LESS (1410 v 855g) and uses readily available filters (77mm). Do a quick search for availability and cost of 112mm filters, as used on the APO Symmar.
The APO Symmar is a massive lens. You'll probably be surprised just how big if you get one in your hands. At almost 1.5kg, it could stress your camera's front standard.