Ritchey-Chrétien 250
This is an optical tube with a 250 mm mirror and a 2032 mm focal length, which is a relatively easily-manageable focal  length suitable for the viewing and imaging of the medium-field deep sky.  It is available in both open truss and closed tube configurations in carbon fibre. It features ventilation of the primary mirror, dew prevention on the secondary mirror and thermometers on both the primary and secondary mirrors, all of which is controlled by a separately sold Control Box.  There are two, Losmandy-style dovetails one on the top and one on the bottom of the telescope with handles on the rear cell. Mirrors are available in Pyrex, AstroSitall and ULE.  These need to be defined at the time of order.  A field-flattener is also available.  The tubes can be anodised in black, red or blue whilst they can also be painted in any colour.  The mirrors are certified by the manufacturer and every optical tube is tested by Starworks using final, deep-sky imaging.  Contact us for further information and quotes.