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Mount Adjust Knob Set
KN40GP knobs come as a set (2 knobs) and will fit any Vixen mount with a worm spindle diameter of 6 mm, ie: SP, SPDX, GP, GPDX, GPE, GP2, GPD2 and also Vixen Porta Mount.
Connects to the mount by either a small Allen head screw or by small thumb screw as shown in pictures.
Finger wheel section is 40mm diameter with CNC milled grooves for comfortable movement with finger tips.
One knob is 50mm long and the other 130mm long.
Anodised black.
Pocket milled for the best finish available.
Made from round aluminium bar no casting or plastic.
Price: £35.00 per set (available from stock)
Ronchi Grating 
High resolution, 250 lines per inch Ronchi
grating. Fitted in 31.7mm aluminium holder
and usable in any telescope.
Price: £75.00
OMC140 Aluminium Dew Shield 
Screw in all aluminium dew shield.
Fits all OMC140 models
Price: £59.00
OMC200 Aluminium Dew Shield 
Screw in all aluminium dew shield.
Fits all OMC200 models
Price: £99.00
OMC140 Polymer Dew Shield 
Wrap around polymer dew shield.
Seals with velcro fasteners.
Fits all OMC140 models
Price: £25.00
OMC200 Polymer Dew Shield 
Wrap around polymer dew shield.
Seals with velcro fasteners.
Fits all OMC200 models
Price: £35.00
Cooling Fan, 31.7mm fitting
Suitable for all telescopes with 31.7mm fittngs.
Runs of any 12volt DC supply.
Price: £59.00
Dew Heater
Fits all telescopes up to
400mm aperure
Price: £69.00
Cassegrain reflector
A type of reflecting telescope (Reflector) in which the light from the object under study is reflected from the main mirror to a convex secondary, and then back to the eyepiece through a central hole in the main mirror.
Arc, degree of
One three hundred and sixtieth part of a full circle (360°)
Arc, minute of
One sixtieth part of a degree of arc. One minute of arc (1') is in turn divided into 60 seconds of arc(60")
Arc, second of
One sixtieth part of a minute of arc. One second of arc: 1".
Equatorial mount
A Telescope mounting in which the instrument is set upon an axis which is parallel to the axis of the Earth; the angle of the axis must be equal to the observer's latitude.
Supernova
The explosion of a star. Supernovae come in two types: Type I is caused by sudden nuclear burning in a white dwarf star. Type II is caused by the collapse of the core of a supermassive star at the end of its nuclear-burning life. In either case, the star is destroyed and the light given off in its explosion briefly rivals the total light given off by a whole galaxy.
Seeing
The quality of observing conditions induced by turbulence in Earth’s atmosphere, which blurs the images of astronomical objects
Magnitude
The measurement of an object's brightness; the lower the number, the brighter the object
UT
Abbreviation for Universal Time, the local time of day on a line of longitude centered on Greenwich, England; also known as Greenwich Mean Time, it forms the basis for all civil timekeeping
Barlow lens
A lens attachment placed into the focuser of a telescope, into which an eyepiece is placed to increase its magnification.
Binary Star
A system of two stars that orbit a common center of gravity; also known as a double star
Waning
The period between full moon and new moon
Waxing
The period between new moon and full moon
Setting Circles
Circular scales on the two axes of an equatorial mount that help an observer point a telescope to a specific right ascension and declination
Aberration
In optics, this is an imperfect focus caused when a mirror or lens fails to bring light to a sharp focus
Our High quality Adjustment knobs are available from stock or special items can be made by request.
Machined by some of the most skilled CNC staff available to the telescope world with decades of experience, using CNC Lathes and milling machines, working to tight tolerances on a daily basis, we will be happy to quote you for any special astronomical components you need.