In every telescope, the focuser is attached close to the focal point of the light-gathering optic. Eyepieces can be connected to the focuser. For astrophotography, a camera is attached to the focuser, and the focuser serves to focus the camera.
ZWO
Electronic Automatic Focuser EAF N
RRP:
$ 342.00
Our price:
$ 314.00
ZWO
Electronic Automatic Focuser EAF Pro
RRP:
$ 510.00
Our price:
$ 456.00
PegasusAstro
FocusCube v3 Universal focusing motor
$ 330.00
Celestron
Focus Motor for SC- and EdgeHD-Telescopes
$ 342.00
Skywatcher
Auto-Focus System for telescopes
$ 102.00
PrimaLuceLab
SESTO SENSO 3 SC focusing motor
$ 342.00
Baader
SteelDrive II focusing motor with Controller<p>
$ 760.00
Rigel Systems
InFocus motor focuser for GSO OAZ Crayford focuser
RRP:
$ 342.00
Our price:
$ 273.00
PrimaLuceLab
Focusing motor SESTO SENSO 3 LS
$ 399.00
PegasusAstro
Motor Focus Kit v2 Celestron SCT (C6, C8, C9.25)
$ 210.00
Rigel Systems
USBnFocus USB adapter for motor focuser
$ 136.00
PegasusAstro
Dual Motor Focus Controller DMFC
$ 239.00
Starlight Instruments
MicroTouch focusing system - 3 piece kit for control of 2.0", MPA retrofits and 2.7" Micro feather Touch focusers - wireless
$ 1,820.00
Starlight Instruments
MicroTouch focusing system - 2 piece kit for control of 2.5", 3.0" FeatherTouch and 2.7" Astro-Physics focusers - wired
$ 1,480.00
Baader
Metal magnetic ring for Homing Sensor Steeldrive II
$ 84.00
JMI
Focus motor for Explore Scientific Configuration 1 focuser
$ 433.00
Starlight Instruments
Micro Touch focusing system - stepper motor for 2.0", MPA retrofits, and Micro Feather Touch focusers
RRP:
$ 800.00
Our price:
$ 580.00
PegasusAstro
Motor Focus Kit v2 Celestron SCT (C14)
$ 285.00
PegasusAstro
Motor Focus Kit v2 Celestron SCT (C11)
$ 285.00
Starlight Instruments
Micro Touch focusing system - 3 piece kit for control of 3.5" FeatherTouch and 4.0" Astro-Physics focusers - wireless
RRP:
$ 1,820.00
Our price:
$ 1,380.00
Starlight Instruments
Micro Touch focusing system - 3 piece kit for control of 2.5", 3.0" Feather Touch and 2.7" Astro-Physics focusers - wireless
RRP:
$ 1,820.00
Our price:
$ 1,380.00
Starlight Instruments
Micro Touch focusing system - 2 piece kit for control of 2.0", MPA retrofits, and Micro Feather Touch focusers - wired
RRP:
$ 1,480.00
Our price:
$ 1,080.00
Starlight Instruments
MicroTouch focusing system - 2 piece kit for control of 32.5" FeatherTouch and 4.0" Astro-Physics focusers - wired
RRP:
$ 1,480.00
Our price:
$ 1,080.00
TeleVue
<p>Focusing motor for NP127is<p>
RRP:
$ 376.00
Our price:
$ 328.00
PrimaLuceLab
SESTO SENSO + ARCO CPC Deluxe HD 8" & 11"
$ 1,460.00
Skywatcher Crayford focuser on a Newtonian telescopeEyepieces and cameras are usually equipped with connector sockets. Two diameters have been established for the connector socket, which are specified in inches: 1.25" = 31.8mm and 2" = 50.8mm.
The focuser consists of two interlocking and sliding tubes, so that the eyepiece can be moved into focus using a small wheel. Not only eyepieces can be attached to focusers, but cameras as well.
Precise focusing is especially important for astrophotography. Therefore, high-quality focusers with reduction adjustment should be used for this application. For astrophotography, many focusers also have a connector thread, so that the camera is screwed into place instead of being be plugged in.
Simple focusers are adjusted using a rack and pinion mechanism. In the higher quality versions, this rack and pinion is angled and made of brass. Instead of a rack and pinion, the adjustment can also be made by exerting pressure on a special surface. Such focusers are usually referred to as Crayford focusers.
Helical focusers work in a completely different way. Here, the adjustment is made by rotating the inner barrel using a longitudinal screw (helix). One advantage is that a rotary knob is not necessary, which can get in the way, for example, of a guidescope.
As a rule, focusers can also be motorised. This improves focusing accuracy and also allows the remote operation of the telescope.