3" VISUAL BACK FOR ESATTO 3" & ARCO 3" PLL15 2 mm Focal length 1624

2 mm Focal length 1624 mm Focal ratio f/8 Linear obstruction 85 mm Corrected field APS-C Backfocus distance 159 mm with standard focuser

110mm diameter

Max diameter

When using a CENTAURUS II tripod

That is true also for apochromatic refractors where the chromatic aberration is generally only corrected for the visible light

3" VISUAL BACK FOR ESATTO 3" & ARCO 3" PLL15 2 mm Focal length 1624This adapter allows to connect an accessory with a 3" nosepiece to the M81 thread of the Prima Luce Lab ESATTO 3" robotic focuser or ARCO 3" robotic rotator. It incorporates a compression brass ring that avoids scratching the accessory barrel. Three locking screws tightly secure any heavy 3" accessory. Optical thickness of the adapter is 12. 5mm. Specifications Material Aluminium Optical thickness 12. 5mm Thread on the focuser side Male M81 x 1 SKU