Consider your main interests when choosing telescope diameter:
- Planets and Moon: 70mm to 130mm apertures offer crisp, detailed views and easy portability.
- Deep Sky Objects: 150mm and above gather enough light to reveal faint galaxies and nebulae.
- Wide-Field Views: Smaller to medium apertures paired with low-power eyepieces work well for star fields and Milky Way panoramas.
Also factor in portability, budget, and setup time to find the best balance for your lifestyle.