Tag: Chretien 254
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omegon Full Tube Ritchey Chretien Telescopes Instruction Manual
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…