Cassi was developed at Yale University and the Institute of Optics - University of Rochester

A few years ago, I found myself eager to delve into astronomy, leveraging my photography skills and optics background. Yet, I quickly found myself overwhelmed by the endless telescope options. They range from $150 to $5,000, but no one really explains why: which mirror size helps you see Jupiter’s moons clearly, or why aperture matters so much when you're observing from city lights.

That frustration inspired me to join forces with Yale University and the Institute of Optics at the University of Rochester. Over three years, my team collaborated with talented senior students and inspiring faculty advisors to develop Cassi from the ground up. We also had the opportunity to utilize Yale SOM’s Founders Practicum, which really helped us refine our approach.

With Cassi, you'll explore how each part works — from the primary mirrors to the focusing knobs. You’ll enjoy discovering how optics influence your view, uncover features that reveal breathtaking deep-sky objects, and learn tips to capture stunning images, even in areas with light pollution.

Cassi is friendly, engaging, and perfect for explorers of all levels. It provides a delightful stargazing experience that is both educational and enjoyable, without any confusing jargon or guesswork. Each adventure feels personal and exciting, making learning about the stars a fun and memorable journey.

— Igor, Founder of Cassi Do‑It‑Yourself Telescope