Riduttore/correttore 0,77x per Esprit 120ED

The owners of the apochromatic refractor Esprit 120ED can now image with a reduced focal length. Although the nominal focal length at f/7 is not excessive, it is always appreciable to be able to reduce exposure times or increase the signal-to-noise ratio (the focal length ratio then becomes f/5.4).

Characteristics

• Resulting focal length ratio (with Esprit 120ED): f/5.4
• Number of lenses: 3 (FMC - Fully Multi Coated multi-layer treatment)
• Backfocus: 55mm
• Corrected image circle (for APS-C): 34mm
• Female threading for 2" filter: Included
• Threading (camera side): M48x0.75
• Threading (telescope side): M74x1