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Feather Touch Focuser - 2" Dual Speed 0.8" Draw Tube Travel, Brake & Compression Ring [FTF2008BCR]

Starlight Instruments   ——   SKU: FTF2008BCR
$546.00 CAD
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About the Starlight Instruments Feather Touch Focuser 2" Diameter Dual Speed 0.8" Draw Tube Travel, Brake & Compression Ring...

Also known as "The Shorty"!

 

In general, Starlight Instruments 2" Feather Touch Focusers can be used on refractor-style telescopes, they can also be used with Newtonians in certain situations depending on where the focal point resides.

 

In the standard model, the base of the adapter is not threaded, instead it uses a 2.7" flange type connector. A base-adapter or tube adapter ring (TAR) is required in all cases for installing the Starlight Instruments 2" Feather Touch Focuser onto your telescope. Optional mounting base adapters are available for installing the focuser on catadioptric rear cells as well as on reflector optical tubes and truss-tube Dobsonian secondary mirror cages.

 

There are coarse and fine focus knobs on the Starlight Instruments 2" Feather Touch Focuser with an approximate reduction ratio of 10:1 for unrivaled accuracy and repeatability. Each revolution of the fine focus knob results in a mere 0.070 inches of drawtube travel, making critical focus effortless. Fine focus repeatability is on the order of

 

Because the Starlight Instruments 2" Feather Touch Focuser is so smooth in operation and moves so freely, it can only hold a limited amount of weight (generally about 1 lb.) without drifting out of focus when the focuser drawtube is not horizontal and has a vertical component. The focuser therefore contains an adjustable tension internal brake system to allow astrophotography and visual use with heavy eyepieces without the possibility of the focus shift.

 

The brake consists of a lever arrangement internal to the pinion block. Adjusting the thumbscrew on the pinion block causes the lever to press a friction pad onto the pinion. This increases the torque needed to turn the Starlight Instruments 2" Feather Touch Focuser knobs. If the thumbscrew is turned all the way in (only 1 to 1 degree turns), the pinion shaft and the drawtube are locked in position for long exposure astrophotography.

 

Visually, partial tightening of the internal brake on the Starlight Instruments 2" Feather Touch Focuser offers a virtually infinite range of braking force to accommodate various eyepiece weights. Moderate finger-pressure tightening of the drawtube tension screw allows the lifting capacity to be adjusted up to a nominal maximum of five pounds, although greater payloads are possible by further tightening the tension screw.

 

This non-marring design of the compression ring option on the Starlight Instruments 2" Feather Touch Focuser will not scratch the barrels of your eyepieces, as a conventional thumbscrew eyepiece holder can. The compression ring also has improved holding power over conventional thumbscrews, even nylon-tipped thumbscrews.

 

 

Starlight Instruments Feather Touch Focuser 2" Diameter Dual Speed 0.8" Draw Tube Travel, Brake & Compression Ring Features...

 

  • Offers a virtually infinite range of braking force to accommodate various eyepiece weights

     

     

  • Pinion shaft and the drawtube are locked in position for long exposure astrophotography

     

     

  • Allows the lifting capacity to be adjusted up to a nominal maximum of five pounds, although greater payloads are possible by further tightening the tension screw

     

     

  • Each revolution of the fine focus knob results in a mere 0.070 inches of drawtube travel, making critical focus effortless

     

     

  • Fine focus repeatability is on the order of

 

 

Starlight Instruments Feather Touch Focuser 2" Diameter Dual Speed 0.8" Draw Tube Travel, Brake & Compression Ring Specifications...

Equipment Type: Telescope Focuser

Size: 2"

Draw Tube Travel: 0.8"/20.32MM

Lifting Capacity: 8-10 pounds

Reduction Ratio: 10:1

Draw Tube Drive Mechanism: Crayford

Racked In from Mounting Face: 1.405"/35.687MM

Racked Out from Mounting Face: 2.205"/56.01MM

Starlight Instruments Product Number: FTF2008BCR