Skip to content

Focuser Boss II with Posi Drive motor vs Robo Focus

August 24, 2016

I get asked a lot to compare our products vs another manufactured product.   As an employee of Starlight Instruments which is the manufacture of the Feather Touch focusers, of course I am a little biased.  For this reason I contacted 2 astronomers and let them test and compare the Focuser Boss II with PDMS motor and the Robo Focus.  Below are their comments:

The Posi Drive has

  1. Low backlash makes for more repeatable focuser positions, which leads to more accurate autofocus.
  2. Higher quality components.
  3. More torque/carrying capacity means less slippage with heavy cameras or high targets… see #1 for implications.
  4. Robofocus is still a 9-pin serial solution, if you want USB/Ethernet/WiFi they need  the Focuser Boss II

Your primary market was making a better focuser, but the automation solutions weren’t the same quality as your focuser , so you designed an electronics solution to go with a motorized option which now gives the astronomer the best of both worlds.

Below is the comment from the 2nd astronomer:

No slipping! Smoother operation.  Easier to disengage for visual or manual focus.  No serial cable or adapter to use.  Better control software.

And a big plus particularly is the built in temperature readout and temperature compensation which is very useful for the slow to cool telescopes.

I currently use the Posi on a TEC140, AT 10” RC, and soon my Epsilon 160.  All which had the robofocus before.

If interested, please feel free to contact me regarding other manufactured comparisons to products from Starlight Instruments.


No comments yet

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: