I just saw this at Surplus Shed?
http://www.surplusshed.com/pages/item/l10514.html

> High quality Computar zoom lens, 105mm to 150mm, f/4.5 to f/5.6. All elements are AR Coated optics with front element multi-coated. Includes threaded front lens shade and cover. Front clear lens diameter is 50mm and rear clear lens diameter is 30mm. Barrel is 70mm diameter, Front lens shade is 85mm diameter. It is Rare to find a medium format zoom lens and when you find one they are usually very expensive. At 150mm the lens appears to cover more than a 4" x 5" format.

They don't appear to include an adjustable aperture.

Now that the TL120 is out there, is anyone still building
their own cameras?
--
John Thurston
Juneau Alaska
http://stereo.thurstons.us