Baader Planetarium 1.25" Eyepiece Bayonet for Harpia Spotting Scope (Zeiss)

Its primary purpose is to allow owners of Zeiss Harpia spotting scopes to use standard 1.25" astronomical eyepieces. This replaces the proprietary Zeiss bayonet, opening the scope up to a much wider variety of eyepiece designs for both astronomical and terrestrial observation.

This adapter is designed for the Zeiss Harpia 85mm and 95mm spotting scopes, making the optical quality of these instruments fully usable for astronomical purposes.

You can use most common 1.25" eyepieces, but there is one important limitation: the eyepiece must be able to reach focus in the Harpia. Some eyepieces with unusual focal plane positions may not have enough focuser travel. Baader confirms full compatibility with their Hyperion and Morpheus eyepiece lines.

By allowing you to use astronomical eyepieces, you can achieve much higher magnifications than the stock eyepiece allows. This is critical for resolving details on planets like Jupiter and Saturn or splitting tight double stars. You can also use wide-field eyepieces to better frame large objects like the Orion Nebula (M42).

Yes. It allows you to select a 1.25" eyepiece that might have longer eye relief (more comfortable for eyeglass wearers) or a different apparent field of view that you prefer for activities like birding. It also allows the use of 1.25" filters, such as a polarizing filter to reduce glare when observing over water.

The bayonet is designed to be attached directly to an individual 1.25" eyepiece and left there. This makes changing eyepieces in the field as fast as using the original Zeiss system—you simply twist and remove the eyepiece with the adapter attached, then insert the next one.