Some texts that deal in a generic, but rigorous, way the fundamentals elements of astronomical opthics, the phenomena that might interfere with it, and some notions of astrophotography.

TECHNICAL OPTICAL TOPICS

• Coating
• Collimation of a Cassegrain
• Evaluation elements on the quality of an astronomical mirror: brief notes
• Interferometers – (first part)
• Interferometers – (second part)
• Surface features of an elliptical mirror
• The Airy Disc

Basic mechanic and insights on Northek products.

TECHNICAL MECHANICAL ARGUMENTS

General considerations on OTA for astronomy, reviews and dedicated articles.

TELESCOPIC TECHNICAL TOPICS

• INTES MK 200 F 6 – WITH CORRECTOR – QUALITY RETROFIT
• NortheK 230
• NortheK Cassegrain Classic 250 mm f 15 (second part)
• NortheK Classic Cassegrain 250 mm f 15 – (first part)
• RETROFIT DALL KIRKHAM 316 MM F 20 FROM Costruzioni Ottiche Zen
• Some hints on the subject of thermal inertia in an amateur telescope

• Sales conditions

• Commercial terms

• Services & Warrianties