Hello Eyal,

Here are a few references to understand how Image Simulation works and how to set up this analysis tool:

• Image Simulation Help page
• How to simulate high resolution images
• How to set up Image Simulation tool?

Regarding your specific question:

Last question, lets say I have a lens designed for object height of 10x10.

In the Field Data Editor I set the object height to 5X7. What  field height should I use in the image simulation?

The Image Simulation tool runs its own calculations, independently of what you set in the Field Data Editor. Therefore you can actually use any field height in the image simulation. Of course, vignetting and image cut-out will happen if you choose a field height larger than the field your lens was designed for in the first place.