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Star Diagonal 31.7mm fitting Prism.
Standard accuracy
Price: £35.00
Star Diagonal 31.7mm fitting Mirror. 
1/10 th PV surface accuracy
Price: £95.00
Star Diagonal 50.8mm fitting Mirror.
Standard accuracy
Price: £85.00
Star Diagonal 50.8mm fitting Mirror. 
1/10 PV surface accuracy
Price: £165.00
Flip Mirror (Vixen)
needs 2" fitting on telescope
This photo/visual accessory slides into 2" focusers and allows flipping between two 1.25" eyepieces or unscrew either 1.25" adapter to attach a T-thread ready camera.
Price: £49.00
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Nebula
A term used to describe celestial objects which have a fuzzy, or nebulous, appearance (from the Latin for cloud.), such as gas, or dust, clouds.
Nova
An existing star which suddenly increases its brightness by more than 10 magnitudes and then slowly fades.
Opposition
A planet is "in opposition" when it appears opposite the Sun in the sky. For the outer planets, this is generally the closest they come to the Earth, and when they are most easily visible.
Zenith
The point on the celestial sphere directly above the observer, or the highest point in the sky reached by a celestial body.
Granulation
The mottled appearance of the Sun's surface, caused by convection within the Sun.
