[Hans Tucker (Hans)]

The brand, and only brand, is Parallax Instruments

If you had a choice:
- 14.5" F/15 Classical Cassegrain, or
- 14.5 " F/20 Dall-Kirkham Cassegrain.

If you could add to the features:
- standard aluminium tube or optional Zero Expansion Carbon Fiber Tube Upgrade.
- Standard pyrex optics or Zero Expansion Sitall