ZWO Seestar S70

Worth knowing before you buy

How much better is the S70 than the S50?

The S70 collects twice as many photons as the S50 due to its larger 70mm aperture, which means faster imaging and better signal-to-noise ratio. However, members note this advantage depends on pairing it with a larger sensor and improved optics; without those upgrades, the benefit is less dramatic.

What price should I expect for the S70?

Members speculate the S70 will cost between $1,500 and $2,000, significantly more than the S50's $595 launch price. Some hope for $999–$1,000, but experienced users caution this is unrealistic given the added complexity and features (improved optics, larger sensor, better mechanics) needed to justify the larger aperture.

Is the S50 worth buying now, or should I wait for the S70?

Members with the S50 find it excellent for its price and portability; waiting for the S70 makes sense only if you specifically need better light gathering or planetary capability. For beginners or those wanting a grab-and-go scope, the S50 is a solid entry point, and the S30 is even cheaper if you prioritize portability over aperture.

What are the main mechanical issues with the Seestar?

Users report the mount can be 'wobbly' between exposures, with retention rates dropping unpredictably even in stable skies. The retention algorithm is a 'black box'—users cannot diagnose or adjust tolerance settings, and rejected frames are not saved, making troubleshooting difficult.

Will the S70 add equatorial mode and cooled sensors?

ZWO's CEO confirmed that new sensors are coming for the S30 and S50, and a ZWO wedge for equatorial mode is planned, but no timeline was given. The S70 is expected to benefit from these developments, though it remains unclear if it will include a cooled sensor or if equatorial mode will be built-in or an optional accessory.

How does the Seestar compare to the Vaonis Vespera for a beginner?

Both are popular all-in-one scopes, but the Seestar is cheaper ($595 for S50 vs. $1,500+ for Vespera) and more portable.