TS-Optics Non Rotating Helical Focuser with M48 connection

TS Helifoc - a short and precise focuser

A true helical focuser like this works like a camera objective - when you turn the focusing ring, neither the lens nor the camera (or eyepiece and diagonal) will rotate. The only motion is in and out.

The advantage of this helical focuser is the fine adjustment possible, in part due to the fine pitch of the focusing ring´s thread, and in part due to the large diameter of the ring. In the case of the TS Helical Focuser, virtually backlash-free movement and graduated markings on the focusers allow repeatable return to the focus point simply by noting the focus position reading.

Advantages of the TS non rotating helical focuser:

no rotation of the diagonal or camera - the only motion is in and out

wide focus range: 51 mm minimum height, 91 mm maximum height

easy adaption to the telescope tube and the camera

good solution for telescope or objective self construction

M48x0.75 (2" filter) threads at both sides, with all adaption possibilities

generous clear aperture of 45 mm

also suitable as variable M48 extension 51 mm to 91 mm for the perfect working distance

two screws for locking the drawtube

Wide focussing range and short length:

The Helical focuser has a wide focussing range of 40 mm, but it is very short, with a minimum height of only 51 mm. So you can use the focuser on telescopes or telephoto lenses with little space to the focus point, like Newtonians.

Note: This focuser is not suitable for heavy accessories, it will tilt.

The main use is with small CCD cameras for planetary photography, 1.25" eyepieces and lightweight 2" eyepieces.

Optional acessories:

Connections to Objectives or Telescope tubes:

TST2-M48L - Adaptor to T2-thread

TSVF230 - Adaptor with 2" barrel (connection to 2" receptacle of telescopes)

TSSC-M48 - Adaptor to SC Thread (connection to Schmidt Cassegrain telescopes)

Connections on the camera site of the focuser:

TSM48-T2 - Short adaptor to T2-thread

TS2-1 - Adaptor with 1.25" receptacle

TS2-1-T2 - Adaptor with 1.25" receptacle and T2-thread