TS-Optics adapter - thread telescope side M86x1 external and M68x1 internal - camera side M68x1 external.

TS Adapter for recessed adaption of correctors in the focuser FTF3215B-A from Starlight

The focuser with the M86 thread connection on the camera side accepts large correctors up to 3" body diameter. This adapter allows correctors to be connected via the M68x1 male thread on the corrector. The corrector is recessed into the focuser, saving valuable optical path. Tilting, which can occur with clamping, is eliminated by the screw connection.

On the camera side, the adapter has an M68x1 male thread for adaptations.

How the adapter works and what to consider:

Screw the corrector into the M68x1 female thread of the adapter.

Then screw the adapter with the corrector into the M86x1 female thread of the extractor.

Please consider that the adapter needs 9 mm optical path (length of the M68x1 female thread and overall length of the adapter) - these 9 mm have to be subtracted from the working distance of the corrector. The advantage is that all larger correctors offer a longer working distance.

Application example: TSKORW3 on a 300 mm f/4 Newton with this adapter:

Working distance of the KORW3 Wynne corrector is 65 mm.

9 mm optical path has to be subtracted - so 56 mm remain from the M68x1 male thread on the adapter.

With suitable adaptions and tuning rings the exact working distance can be achieved.