Sky-Watcher Esprit Flattener for 150 EDX - S20219 100 mm Refractors The Askar 91F is a

The Askar 91F is a self-flattened design that allows users to avoid calculating the back focus and buying additional flattener

it is also one of the most portable

Here are the adapters & hardware included in the D2 Combo

For many birders

1mm Freedom Find Yes Clutch Type Hand Clutch Can clutches be adjusted Yes Built-in WiFi Yes Hand Controller Optional Database Complete Messier

Sky-Watcher Esprit Flattener for 150 EDX - S20219 100 mm Refractors The Askar 91F is aAdd this two element field flattener to your Sky Watcher Esprit EDX 150 to achieve edge to edge field flatness and an image circle of 44 mm. Field Flattener or Reducer? Flattener Thread On or Insertable Thread On Corrector Thread size M65x1 female M62x1 male Corrector Back Focus 96mm Corrector illuminated field 43mm Corrector adapter needed? Yes (Included with telescope) Corrector allow for 2" filters? Yes