Manufacturer: -TS Zubehör
Product number: TSFOCN1

EUR 108,90


incl. 19 % VAT (DE)  
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  • Details..
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  • In the box..
  • FAQ..
A solid 1.25" Crayford focuser for the self construction of Newtonian telescopes
This focuser is a good solution for astronomers who want to build a Newtonian telescope themselves or improve an existing telescope. The focuser is versatile and can be used for observation and astrophotography.

The most important properties and product features:
Suitable for tubes from 178 mm diameter - the base is curved. Smaller tubes require a spacer, for example washers.
The focuser can also be used for larger tubes, so that it rests firmly on the outer edges.
The focuser is ball-bearing mounted, which ensures good adjustment even with heavy accessories.
The position of the extension tube can be fixed with a knurled screw.
A second knurled screw adjusts the movement resistance (friction). Even heavy accessories can no longer sag.
When unscrewing the 1.25" receptacle, the internal T2 thread (M42x0.75) becomes visible. Then you can screw on a camera with our adapter T2a-T2a and the matching T2 ring.


Quick manual
Telescope-Service provides a quick guide for the TS Crayford focusers. You can download the PDF here.
Type:Newtonian focuser with ball bearing
Overall height for tube with nominal diameter:56 mm for T2, 78 mm for 1.25" (all dimensions approx.)
Overall height above the lateral edges:63 mm for T2, 85 mm for 1.25" (all dimensions approx.)
Height without base plate:50 mm for T2, 71 mm for 1.25" (all dimensions approx.)
Adjustment range:48 mm
Free aperture:41 mm (w/o 1.25" adapter)
Adapter plate to the telescope:Curved adapter plate, suitable for tubes from 178 mm diameter.
Connection dimensions:Screw spacing lengthwise approx. 57.5 mm, crosswise approx. 55 mm
Telescope side ring dovetail:⌀ 61 mm
External dimensions base plate:71 mm x 71 mm
Baseplate mounting to tube:M5 cyl head screws (not supplied)
Eyepiece-side connection:T2 female thread (M42x0.75) and 1.25" (31.7 mm) receptacle
Weight:0.385 kg
1.25" focuser with telescope connection plate


Question:
What´s the best way to adjust a Crayford focuser???

Answer from Teleskop-Service:
The focuser has two knurled screws at the base between the two rotary handles. With these you can adjust the focuser.
The screw on the eyepiece side is for adjusting the friction (fgrip).
The screw on the telescope side is for locking the focuser position.


1. Insert the eyepiece and possibly the star diagonal into the focuser so that the focuser is under load.

2. Loosen the screw on the telescopie side (clamping).

3. Now tighten the screw on the eyepiece side just enough to prevent the focuser from slipping when the eyepiece is pointing downwards (maximum load).

With this you have optimally adjusted your Crayford for observation and of course also for photography.


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Reviews

Written by Damjan Mlakar
on 2021-12-03

"Perfect for my home made newton. Even I need made some modifications on tube...as expected."

Written by Tom Regnery
on 2021-04-06

"Im Grunde das kleinere Modell der 2""-Crayfords. Um einem kleinen Newton einen stabilen leichtgängigen OAZ anzubauen absolut zu empfehlen. In meinem Fall war er leider zu hochbauend. Das hängt aber vom Teleskopdesign ab und ist kein Qualitätsmerkmal."

Written by Bastian Schmandt
on 2020-05-26

"Verstellung der Spannung für die Druckrolle etwas fummelig, Vestellweg ist sehr lang, daher baut der Auszug etwas hoch auf und der Fangspiegel muss groß dimensioniert werden. Dafür kann mein Newton jetzt sehr gut fokussiert werden und auch sehr nahe Objekte zeigen. Dies ist gut, um z.B. bei Tag den Pointer zu justieren "

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