Using a Star Analyser on a telescope that requires 2" filters

If your system takes 2″ filters, you will need a 2″ to 1.25″ thread adapter. Vignetting is not a problem if you place your target star away from the sensor edges.

Here are some suggested sources of adapters:

All locations:

ZWO: 2”-1.25” Filter Adapter Ring: link. This filter is preferred in filter wheels because it doesn’t change the height of the filter. We buy these from Cloudbreak Optics: link.
See this discussion on how to use a filter drawer on 2″ systems: link.

In the US:

Agena AstroProducts: Blue Fireball thread adapter: link.

In the UK:

365Astronomy: Filter adapter: link.

In Germany:

Teleskop Service/Express: link. These will also work with the SA-100 in a ZWO filter drawer.
Baader Planetarium: use #1508030 Baader Double T-Filterholder 1¼” and #2458110 Baader Expanding Ring T-2f / M48m.

Note: if your system is designed to take un-mounted drop-in filters. and our calculator calls for the SA-200 (link), you can use our mounting kit (link) rather than a thread adapter.

Are you planning to use your Star Analyser with a filter wheel? You’ll likely need a Star Analyser 200. See link for more info.

Using a Star Analyser on a telescope that requires 2″ filters