Skywatcher ExtraFlat Wide-Angle Eyepiece Range collimator Cooling: Thermoelectric set point with

Cooling: Thermoelectric set point with max ΔT=>-40°C

and features

but it’s the optics inside the telescope tube that make it a Celestron

the Caldwell Catalog

Cooling ΔT=>-40°C

Skywatcher ExtraFlat Wide-Angle Eyepiece Range collimator Cooling: Thermoelectric set point with16mm 27mm 53 65 FoV 5 or 6 Element 1. 25" Barrel The exotic 1. 25 ExtraFlat 5 or 6 element eyepiece design packs premium features and high end performance into a surprisingly affordable package. The optical designer has succeeded in removing peripheral field curvature so now you can enjoy flat, virtually distortion free images from the centre to edge of the field. Optical performance is impressive, with excellent sharpness, contrast and colour