Reducer / Corrector 0.77x for Spirit 150ED

Espirit 150ED apochromatic refractor owners can now image with a reduced focal length. Although the nominal f/7 focal ratio is not excessive, it is always appreciated to be able to reduce exposure times or increase the signal-to-noise ratio (the focal ratio then becomes f/5.4).

Characteristics

• Resulting focal ratio (with Esprit 150ED): f/5.4
• Number of lenses: 3 (Fully Multi Coated FMC 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