Manufacturer: -TS Zubehör
Product number: MonorailR86

EUR 249,90


incl. 19 % VAT (DE)  
The VAT indicated refers to that applicable in Germany. After logging in, the VAT amount is adjusted to the applicable VAT of the stored delivery country. Therefore, the final price may vary accordingly.
excl. 6.95 € shipping costs (DE)  
Please log in to calculate shipping costs to your country.
more details to the shipping costs ...

  • On stock





There are no reviews for this product
  • Details..
  • Technical data..
  • In the box..
TS-Optics 2" MONORAIL Focuser with 86 mm Flange
The TS Monorail focuser for many refractors from Skywatcher, Celestron and Orion is an improvement of the time-tested Crayford focusers. Our goal was to offer a focuser for highest loads, like heavy CCD cameras, with very high precision at the same time. We exactly succeeded in this with the Monorail focusers.

The MonorailR86 has an 86 mm connecting flange on the telescope side with three M4 internal threads. This allows the connection to Skywatcher, Celestron and Orion refractors with 90 mm tubes, as they are often used with 80 mm and 90 mm aperture.

The advantages of the TS Monorail focusers at a glance:
higher load capacity than with normal Crayford focusers - instead of small ball bearings, a massive stainless steel rail, which is laterally clamped, is used.
more precise guiding of the draw tube and no more tilting when locking
smooth motion and finest adjustment even at loads of up to 4 kg
1:10 dual speed for accurate focusing
Motor focus can be retrofitted


Operating principle of the Monorail focuser and the advantage compared with Crayford focusers:

Instead of small ball bearings, like in Crayford focusers, a massive stainless steel rail handles bearing and also lateral fixing.

The disadvantage of Crayford focusers with ball bearings: The small ball bearings of the Crayford focuser are loaded if locked. As the locking screw is not placed exactly between the ball bearings, one pair of the bearings is more heavily loaded. This results in tilting and unsharp stars in one corner.

The advantage of the MONORAIL principle: The function of the ball bearings is taken over by the stainless steel bar which is firmly connected to the draw tube. Nothing can bend anymore. Only lateral guidance is taken over by ball bearings. These bearings only fix the lateral position and do not need to take on load anymore.

The drawtube is fixed with a locking screw which is exactly centered at the upper side, so the entire construction is evenly loaded. Tilting is definitively avoided, the draw tube stays exactly at the given position.

With the middle screw of the "quincunx", only the friction is adjusted - see image at left.



Telescope connection:Flange, 86 mm diameter with three radial M4 thread bores
Eyepiece side connection:2" receptacle with compression ring and reduction adapter to 1.25"
Minimum height from telescope flange to 2" receptacle:91 mm
Draw tube travel:50 mm
Scale:mmm and inch
Dual speed:included
Bearing:Stainless steel rail - Monorail principle
Weight:860 g incl. 1.25" reduction adapter
2" Monorail focuser with 86 mm flange
Reduction adapter from 2" to 1.25"



Recommended accessories

Reviews

Written by Hans-Peter Ladwig
on 2023-02-13

Habe meinem Refraktor ( Bresser 4 Zoll) mit diesem Okularauszug ein ordentliches "upgrade" verpasst.
Der Okularauszug arbeitet über den Feintrieb wunderbar leicht und präzise.

Written by Tom Regnery
on 2020-08-19

"Sehr stabiler und hochwertiger Okularauszug. Einziger geringfügiger Nachteil: Die 5 cm Auszugsweg sind etwas wenig, daher ist es häufiger nötig, mit zusätzlichen Ringen/Hülsen zu arbeiten. 2 bis 3 cm mehr Fukossierweg würden dieses ?Problemchen? lösen."