wista VX technical

[Terry Hull]

I have a schneider apo 100mm f5.6 and a Nikon 200M f8 that I use on an ebony23S. Anyone know if they have a chance of covering wista VX 4X5 I am thinking of buying?

[Ron Marshall]

The image circle of the 100mm f5.6 is 145mm so it will not cover 4x5 inch, which has a diagonal 155mm. Also, a larger image circle than 155mm is needed for movements. The Nikon 200mm F8.0 has an image circle of 210mm so it will cover 4x5 with ample movements for field use.

[Sam Crater]

That's interesting, I have a 100mm Rodenstock Sironar N that's listed as having the same angle of coverage (72 degrees) as the Apo-Symmar 100 and yet its image circle is listed as 151mm. Schneider and Rodenstock are not using the same trigonometry somehow. Anyway, I use the Sironar N on 4x5 with no movements and like the results, so I would try the Apo-Symmar and see how it does.