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.
Lacerta
Micro reduction ratio focuser retrofit
$ 118.00
Astroprints
Fine-focuser upgrade for Celestron SC Telescopes
$ 23.90
PegasusAstro
Prodigy Microfocuser
RRP:
$ 1,210.00
Our price:
$ 1,180.00
Vixen
Dual-Speed-Focuser Upgrade Kit
$ 241.00
Tecnosky
Micro Focuser Fast-Reverse
$ 423.00
Starlight Instruments
Feather Touch fine focuser for CPC 9.25 SCT
RRP:
$ 930.00
Our price:
$ 660.00
Lacerta
Micro Focuser Skywatcher MC 150 & MC 180
$ 240.00
Starlight Instruments
Micro pinion assembly fine focuser for Televue with brake (TVRFB-II)
RRP:
$ 1,120.00
Our price:
$ 880.00
Starlight Instruments
Micro pinion assembly fine focuser for older Televue OTAs with brake (TVRF)
RRP:
$ 1,120.00
Our price:
$ 880.00
Starlight Instruments
Fine focuser for Meade 8" SCT
RRP:
$ 910.00
Our price:
$ 700.00
Starlight Instruments
Feather Touch fine focuser for Meade 14 SCT
RRP:
$ 900.00
Our price:
$ 690.00
Starlight Instruments
Micro pinion assembly fine focuser for Takahashi with TAK 2.7'' (TRF102)
RRP:
$ 1,090.00
Our price:
$ 780.00
Starlight Instruments
Micro pinion assembly fine focuser for older Televue OTAs with brake (TVRF)
RRP:
$ 1,090.00
Our price:
$ 780.00
Starlight Instruments
Feather Touch fine focuser for Celestron C14 Edge HD telescope
RRP:
$ 960.00
Our price:
$ 670.00
Starlight Instruments
Feather Touch fine focuser for C8 SCT
RRP:
$ 910.00
Our price:
$ 640.00
Starlight Instruments
Feather Touch fine focuser for CPC 8 SCT
RRP:
$ 910.00
Our price:
$ 640.00
Starlight Instruments
Fine focuser for Meade10"-12" SCTs
RRP:
$ 910.00
Our price:
$ 640.00
Starlight Instruments
Feather Touch fine focuser for C14 SCT
RRP:
$ 970.00
Our price:
$ 670.00
Starlight Instruments
Feather Touch fine focuser for CPC 11 SCT
RRP:
$ 910.00
Our price:
$ 640.00
Starlight Instruments
Feather Touch fine focuser for C-9.25 SCT
RRP:
$ 930.00
Our price:
$ 660.00
Starlight Instruments
Feather Touch fine focuser for C11 SCT
RRP:
$ 910.00
Our price:
$ 640.00
Starlight Instruments
Micro Focuser Mikrofokussierer Feather Touch FTF1575PA-DS upgrade
RRP:
$ 560.00
Our price:
$ 362.00
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.