Astro-Physics Feather Touch Micro Upgrade for Astro-Physics 4

Watch your images snap into focus with this Feather Touch Micro Upgrade. Astro-Physics teamed up with Starlight Instruments to produce this dual-speed assembly, which features a 9:1 reduction knob. The coarse-focus knobs allow you to rack the drawtube out quickly, and the fine knob is used to find and hold the final focus point. Ideal for very high powers with short focus oculars and Barlow amplifiers. It will also allow quick, precise manual focusing with CCD cameras. You'll love the smoooooooth feel. It can be mounted so that the fine focus knob is either on the right or the left side for your convenience.

We recommend the dual-speed focuser for those who are primarily visual astronomers and for manual focusing with imaging equipment. If you plan to use electric focusing motors and accessories, we recommend that you do not upgrade at this time.

This upgrade is available for 4” Focusers and refractors shipped since October 2001. In order to determine whether your focuser can be upgraded, please compare the hole pattern on the bottom of the pinion block of your focuser to the photos below. Focusers that can be upgraded must have pinion block A1022-A.

All other scopes shipped prior to October 2001 cannot be retrofit with this Feather Touch Micro assembly due to the configuration of the pinion block. These early pinion blocks are shown as part # A1022. If your scope was produced prior to October 2001 and already has a 4" focuser, you can easily substitute the new version that features the greaseless drawtube and Feather Touch Micro Dual-Speed Knobs.

Previous version pinion blocks (our part # A1022) that cannot be updated.

Focusers with this pinion block (our part # A1022-A) can be updated with the Feather Touch Micro assembly for 4" focusers. This pinion block can be found on scopes shipped after July 1, 2001.