PD manufactured many different lenses that fit these projectors. Some that zoom, others that have fixed throw ratios. There are even extra-high-quality ones for the projectors with the most pixels.

The website projectorcentral.com lists a few ones for the F35:

EN41 Standard Zoom Lens Throw Ratio 1.69:1-2.50:1

EN43 Wide Zoom Lens Throw Ratio 1.20:1-1.69:1

EN44 Short Tele Zoom Lens Throw Ratio 2.50:1-4.61:1

EN45 Ultra Wide Zoom Lens Throw Ratio 0.80:1-1.21:1

But these are only some of the ones available from the factory.