The tube is constructed from Carbon Fibre sandwich design - very, very strong to avoid flexing and, zero expansion to ensure the focal plane does not change over long photographic exposures.
To assist cool down of the telescope, each model is fitted with three fans, all positioned behind the primary mirror.
Precise focusing is achieved by the application of our new 3” Crayford focuser on all models. Large bearings are placed in optimum positions to spread the load of the drawtube / corrector and, any camera which will be fitted.
A 10:1 reduction drive is included as standard and, as an option, we can include our electronic drive system with variable speed focusing control.
To produce the remarkably flat photographic field, we have designed and built our Corrected Field Flattener (CFF). This design is based on the Wynne Corrector, often used in similar telescopes. We have taken this design a leap forward and increased the performance over a wider field. Spot sizes are incredibly small and regular across a very wide field (see Specification list for details). The use of specialised ED glass types ensure both colour correction, coma and spherical aberration are optimised to achieve almost a perfect photographic, very wide field. 79mm of back focus allows virtually 100% of modern CCD cameras to be used with auxiliary equipment. The CFF is coated with low loss, multi layer anti reflection coatings to maintain brighter images.
CNC machined mono construction secondary spider and trim ensures stability in collimation. Our unique collimation adjustment system enables perfect collimation of the secondary mirror to be achieved, quickly and reliably.
The main mirror is held in our newly introduced, computer optimised, nine point suspension cell. This balances the mass of the mirror over a much larger area and provides sharper, better defined images
The AG Astrographs are exceptional performers on deep sky. Quality in optical and engineering design and, stringent quality control measures, assures the imaging process is capable of producing some of the finest images ever taken with amateur equipment