Manufacturer: -TS Zubehör
Product number: MonorailN2

EUR 239,00


incl. 19 % VAT (DE)  
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TS-Optics 2" MONORAIL Newtonian Focuser
The TS Monorail focuser for Newtonian telescopes 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 advantages of the TS Monorail Newtonian 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 rail 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:Dovetail ring - 78 mm large diameter
Eyepiece side connection:2" receptacle with compression ring and reduction adapter to 1.25"
Minimal height without base:70 mm
Minimal height with base:approx. 75 mm
Draw tube travel:50 mm
Gear reduction:included
Bearing:Stainless steel rail - Monorail principle
Weight:730 g
2" Monorail focuser for Newtonian telescopes with dovetail ring
Reduction adapter from 2" to 1.25"
Adapter bases for other Newtonian tubes are optional



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Reviews

Written by Franz Kassnel
on 2021-06-05

"Ich habe ein Bresser Pollux 150/750 mit diesem Auszug umgebaut. Bin sehr zufrieden, den mit diesem Auszug kann man sehr gut Fokussieren. Das ist jetzt richtig stabil, es kipt nicht wenn ich meine Nikon D5100 adaptiere. "

Written by Franz Steiger
on 2021-04-16

"Ein butterweich und sehr feinfühlig einstellbarer Okularauszug. Die Klemmungen halten Zubehör stabil und beschädigen es nicht. Somit ist der Auszug ideal zum Umrüsten eines Newtons. Allerdings ragt das Auszugsrohr in eingezogener Position ca. 25mm in den Tubus. Somit könnte bei der Montage ein Distanzstück zwischen Tubus und Basis zweckmäßig sein."

Written by frank kerber
on 2019-12-31

"Das Produkt überzeugt. Der Auszug läuft sehr fein und ist sehr wertig verarbeitet. Ich kann das Produkt nur weiter emofehlen. "

Written by Thomas Kuch
on 2016-12-04

"...noch nicht verbaut, macht aber einen sehr wertigen Eindruck!"