The Takahashi TOA-35 Flattener is a 0.99x field flattener for the TSA-120, TOA-130 & TOA-150B apo triplet refractors. The TOA-35 Flattener has an image circle of 40mm, making it suitable for use with APS-C sensors.
The TOA-35 Flattener connects to the TKP27110 Ocular Adapter 50.8 with its 2" barrel and features an M48 x 0.75 thread on the telescope side for connecting standard 2" mounted filters. The camera side is also a 2" barrel receptacle with a generous backfocus allowance of 117.5mm measured from the end of the housing.
Spot diagram of Takahashi TSA-120 with TOA-35 FL field flattener.
Spot diagram of Takahashi TOA-130 with TOA-35 FL field flattener.
Spot diagram of Takahashi TOA-150B with TOA-35 FL field flattener.