Concept: CCD cameras have challenged telescope optics beyond anything ever placed at the focal plane. I knew our APO objectives were up to the challenge, and with the proper tweaks would be extraordinary tools for the imager. With Tele Vue Imaging System ("is") telescopes, we have refined our instruments and optional equipment beyond anything a CCD chip has seen. We started small (literally) in 2005 with the Tele Vue-60is and available Digital Micrometer Kit. Achieving critical acclaim with the 60is, we were encouraged to further develop "is" telescopes and accessories to maximize aperture, real field coverage and performance, and to make the processes easier for the imager. - Al Nagler

For 25 years, Tele Vue has pushed the boundaries of APO refractors, as well as eyepieces, to the recognized pinnacle of performance. We were gratified but not surprised that Backyard Astronomer's Guide said of the NP101: "optics don't get any better than this." No wonder "Sky and Telescope" rated the NP101 tops (May & June 2002) and selected it as the test instrument for its landmark review of the SBIG STL11000 CCD camera (July 2004). The "is" versions of the Tele Vue- 60, 102i, NP101 and NP127 retain the exemplary wide field and planetary visual capability while adding new features to make imaging easier and more flexible.

Tele Vue-102iis Need back focus? The Tele Vue-102iis has it. Typically, reducer/correctors for doublet or triplet refractors swallow precious back focus which could otherwise be used for accessories. Since the Tele Vue-102iis is the Imaging System version of the Bino Vue ready 102i, the short tube provides the imager with nearly 4" between drawtube and 0.8x reducer/flattener.

TV-102iis system with case. Five-inch extension tube, two-inch accessory adapter and imaging insert shown in inset and enlarged.

Visually, the 102iis functions at its native 880mm, f/8.6 for 1x Bino Vue use. Astrophotography requires the use of the dedicated 0.8x reducer/ flattener, yielding a 704mm, f/6.9 system.

Imaging System scope with DSLR camera on Vixen Sphinx mount. Accessories shown include Focusmate Driver and Digital Indicator Kit.

The 4" APO-doublet objective makes the 102iis one of the least expensive, multi-purpose, high performance, scopes available in its aperture class.

Mechanically, the Tele Vue-102iis features the large 2.4" focuser. The non-vignetting focuser prevents any restriction of the converging light cone. The draw tube has a 3" front aperture and 2.4" rear aperture. This new draw tube also permits quick change from visual to imaging operation and allows full camera rotation without focus change. In addition, it has the capability to correct for any residual focal plane tilt and accepts a "position stop" for our digital indicator to allow repeatable focus measurement to 0.0001".

To maintain squareness to the optical axis while changing camera orientation, the draw tube has four lock screws that tighten against a taper on the "imaging insert" ring. This insert is, in turn, threaded to accept Tele Vue's new Imaging System series of accessories including large diameter extension tubes, optical accessories, and camera and CCD attachments, all with mating threads.

Click here for TV-102iis Component Recommendations (Adobe PDF) for prime-focus imaging with various style cameras
Click here for Imaging System Accessories

The Focusmate 6:1 planetary ball type reduction focuser provides extremely sensitive focus adjustment, measurable with the optional Digital Indicator Kit to better than 1/10,000". Also, the optional Focusmate Driver permits electronic motor control of the focusing process. The Focusmate Driver has direction push-buttons and adjustable speed. A tap on the button permits vibration-free focusing in steps as small as approximately 0.0005". The Focusmate Driver can be remotely computer controlled with Focusmaster Computer Interface.

Tele Vue has been known for producing visual instruments "even better than you imagined." We aim to achieve the same with our imaging equipment. Our dedicated local machinists and in-house staff are as committed as ever to deliver on these quality and performance goals.