TS-Optics Photoline Refractor - ED 60 (Doublet) Bahtinov Mask Inner thread: four 1/4" internal

Inner thread: four 1/4" internal threads and four M10 internal threads along the central axis

This is often due to the focal plane and the camera sensor not being precisely parallel with each other

Optical path: 18mm wide

IMPORTANT WARNING: These nebula filters are NOT designed for observation of the Sun

The extremely high sensitivity is achieved thanks to the SONY back illumination technology

TS-Optics Photoline Refractor - ED 60 (Doublet) Bahtinov Mask Inner thread: four 1/4" internalTS Optics PhotoLine 60 mm f 6 apochromatic FPL53 refractor: The TS Optics PhotoLine 60 mm Apo is the travel telescope you have always been looking for. Thanks to the sliding dew cap, the telescope has a transport length of only 23cm. This means that it can be carried even as hand luggage. Mount this APO Refractor on a photo tripod or on an astronomical mount and you'll be amazed by the excellent optics and the high quality mechanics of this telescope.