2" CATSEYETM Sight Tubes

Now there are 2 models to choose from
in 2" Telescoping Sight Tubes!

The original "XL" (f/3.5 - f/6.0) &
the shorter "XLS" (f/3.0 - f/5.0)

2" TELETUBE XL & XLS Telescoping Adjustable Sight Tubes
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Choose the model that's best suited to match your scope's f-ratio!
Larger-aperture, low f-ratio Newtonian telescopes with larger diagonal mirrors are becoming the norm, and the need for a precision 2" Sight Tube for properly positioning the Secondary beneath the focuser is a given. The CATSEYE line of "telescoping" sight tubes feature tuneable "length" capability to obtain the optimum tube-opening/Secondary "gap" resolution for insuring symmetrical intercept of the Primary light cone for maximum FOV illumination and contrast while maintaining axial registration via flush shoulder contact with the focuser drawtube lip.

For Newtonian's with f-ratio's under f/4.7, the shorter "XLS" model (f/3.0 to f/5.0) is recommended for "seeing" that generous "oversized" Secondary (typical of imaging astrographs).

2" TELETUBE XL & XLS Telescoping Adjustable Sight Tubes - collapsed
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2" TELETUBE XL & XLS Telescoping Adjustable Sight Tubes - extended
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The TELECATTM "Combo" Tools have:
  • All features of the TELETUBE XLTM and XLSTM above.
  • Addition of the BLACKCAT XLTM reflective ring enabling the TELECAT XLTM and XLSTM to function both as a sight tube and as a Cheshire as well.

TELECAT XLTM Vic Menard Endorsement
2" TELECAT XL Telescoping Adjustable Sight Tube Reflective Cheshire Ring
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TELETUBE XLTM & TELECAT XLTM TELETUBE XLSTM & TELECAT XLSTM
2" TELETUBE XL Telescoping Adjustable Sight Tube - collapsed 2" TELETUBE XL Telescoping Adjustable Sight Tube - extended
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2" TELETUBE XLS Telescoping Adjustable Sight Tube - collapsed 2" TELETUBE XLS Telescoping Adjustable Sight Tube - extended
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2" XLTM & XLSTM Sight Tubes incorporate:
  • Large 1.759" Aperture.
  • Telescoping length adjustable from:
    XL: f/3.5 to f/6.0
    XLS: f/3.0 to f/5.0
  • Slide Position Locking Set Screws w/hex wrench.
  • Calibrated f/no. Ruler accessory marked in f/.1 increments.
  • Precision machined from T6061-T6 Aluminum & Black Delrin.
  • 90-degree Intersecting .029" dia. Stainless Steel cross-hairs.

2.00" TELECATTM Kits Include:
  • 2" TELECATTM Tool and Application Procedure.
  • 2 large Primary mirror red or white reflective triangle center spots.
  • 15" or 32" Max. Mirror Center-Spotting Template.
  • 1 - Primary Center-spotting Procedure.
  • 1 - Comprehensive Collimation procedure.
New Prices Effective: 9/7/08

2" TELECAT XL or XLS Telescoping Adjustable Sight Tube Reflective Cheshire Ring
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With 15" Max. Template
(for Primarys 4" - 15" in diameter):
TELECAT XLTM
(f/3.5 - f/6.0)

Choose Spots:

Price: $125

TELECAT XLSTM
(f/3.0 - f/5.0)

Choose Spots:

Price: $120

With 32" Max. Template
(for Primarys > 15" diameter):
TELECAT XLTM
(f/3.5 - f/6.0)
Choose Spots:

Price: $135

TELECAT XLSTM
(f/3.0 - f/5.0)
Choose Spots:

Price: $130