| With the rapid proliferation of larger-aperture, low f-ratio Newtonian telescopes with 2" focusers and larger diagonal mirrors, the availability of a precision 2" Sight Tube is long overdue. Additionally, this novel "telescoping" collimation tool will allow the the discriminating, performance-minded amateur to custom adjust the sight tube length to EXACTLY MATCH the f-ratio of his Newtonian. Unlike fixed-length (and f-ratio) 1.25" sight tubes, this unique tool will allow you to get that big Secondary mirror in EXACTLY the right axial position to symmetrically capture the Primary light cone for maximum illumination and contrast.
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The 2" TELETUBE XLTM Sight Tube incorporates:
- Large 1.759" Aperture.
- Telescoping length adjustable from f/3.5 to f/6.0
- Slide Position Locking Set Screws w/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.
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| The Deluxe 2" TELECAT XLTM "Combo" Tool has:
- All features of the TELETUBETM above.
- Addition of the BLACKCATTM reflective ring enabling the TELECATTM to function as a Chesire as well.
Vic Menard speaks about the TELECATTM :
Vic Menard's Endorsement
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"XL" ! 
