The 135mm Wide Field Ektar was designed for the 5x7 format, so it will cover 4x5 with no problem. You'll get the "sweet spot" of the 135, and the coverage is 229mm. However, it won't be much wider than the 152mm Ektar. If you want a wide angle lens for the 4x5, the 100mm f/6.3 Wide Field Ektar is a true wide angle, although lens movements will be a bit limited, since it's coverage circle is only 183mm; and as you probably already know, a 4x5 needs just over 162mm for full coverage.