3" VISUAL BACK FOR ESATTO 3" & ARCO 3" PLL15 That is true also for

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

When using a CENTAURUS II tripod

The GEM28 is equipped with the latest advanced GOTONOVA® GOTO technology

001% (OD5) @ 300-1000 nm Coating Double-sided multilayer nano-coating Surface quality 60/40 (in accordance with US military watch MIL-O-13830) Parallelism <30" Glass type Schott monolithic optical substrate (non glued) Filter size Mounted 1

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

3" VISUAL BACK FOR ESATTO 3" & ARCO 3" PLL15 That is true also forThis 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