Tag: Chretien 254

omegon Full Tube Ritchey Chretien Telescopes Instruction Manual   Omegon® Pro Ritchey Chretien Full Tube Congratulations on the purchase of your new Omegon® Pro Ritchey Chretien telescope! Among the Cassegrainian systems the Ritchey-Chretien is the unrivalled champion: it is the two-mirror telescope with the highest correction level available. In contrast to other variants, like Pressman…