Reducer 0.7x for 108/600 Quintuplet APO

The dimensional drawing contains the connection threads of the reducer:

They are on the telescope side:

• An M80x1 internal thread on the mount of the lens pack (please use very carefully!)
• An M90x1 internal thread outside the lens mount - this is the standard thread for connection to the camera. Omegon Apochromatic refractor Pro APO AP 108/600 Quintuplet OTA

An M48x0.75 external thread is available on the camera side. Its flange has an optical length of 20.2 mm and can be rotated using the three bronze grub screws (M6).

The dimensional drawing is not quite complete:

• There is an M48x0.75 filter thread inside the reducer. This is accessible when the camera-side part is completely unscrewed.
• The vignetting of full-frame sensors can also be reduced if the camera-side part is unscrewed: It is screwed to the lens pack with an M78x1 thread. A back focus of 75.2mm then applies from this thread. Corresponding adaptors can be screwed onto the M78 external thread of the lens pack.

(Benjamin Mirwald)