Internal Threaded 2.7" Focuser with Feather Touch Micro 9:1 Dual-Speed Knobs (I27FOC3-FT)
Brand : Astro-Physics
This Traveler-style focuser is virtually identical to the 2.7" Focuser (27FOC3E-FT) except that the focuser body (that houses the drawtube) has an internal thread that attaches to the Traveler tube. All other construction features and specifications are the same. The I27FOC3E-FT focuser offers critical focusing and a greaseless drawtube with a "mm" focusing scale. All of these are attributes that Traveler owners will find appealing.
This Traveler-style focuser is identical to the Traveler focuser, except that it does not have the word "Traveler" engraved on the housing.
To replace the focuser, simply unscrew the focuser from the OTA (counter clockwise) and replace with the new one. It's that easy! Be sure that you don't use the focuser knobs for leverage, or you may bend the pinion gear. We suggest that your Traveler be attached to your mounting or have someone else hold the tube as you remove the focuser.
The focuser includes the 2" (ADA2003A) and 1.25" (ADA125) adapters.
Weight is 5.6 lb. (2.5 kg)
Internal thread of the focuser housing is 4.320" x 24
Note: Traveler end tube male thread is 4.300" x 24
Instructions for installation:
To substitute focusers, simply unscrew the focuser from the OTA (counter clockwise) focuser and replace with the new one. Do not use the knobs for leverage, or you may bend the pinion gear. We suggest that your Traveler be attached to your mounting or have someone else hold the tube as you remove the focuser.
Accessories to consider:
You may prefer a sturdier cover than the included plastic plug. Astro-Physics also offers an optional aluminum cover that will accommodate this part, depending on your storage needs. Please review the information regarding the Threaded Cover for AP 2.7" Drawtubes and Accessories with 2.7" Female Threads (A1005). More information can be found on our Accessory Reference Chart for 2.7" Threaded Covers.
A digital focusing system is available for imaging automation. Visual observers may also enjoy using the available hand paddle with the digital system. See the Focuser Boss II Electronic Focusing Control Kit for more details.