Altair Astro Planeta 101mm APO Refractor Telescope
The Altair 101 ED APO has a new long focal length ED doublet objective design with complete freedom from colour aberrations. This is a telescope with premium optics for serious visual astronomy, at a remarkable price. it is very well suited for visual observation where sharpness and contrast are important.
A long focal length refractor is easy to focus due to the extended depth of field and gives extremely sharp images. The long focal ratio minimises eyepiece aberrations, resulting an extremely flat field of view. An F11 telescope copes extremely well with turbulent air or "seeing", due to it's extended depth of field. Until now, however, there are no APO refractors with a focal ratio in the "portable" sweet spot at F11.
Relaxed but powerful. Long focus refractors have always been a favourite telescope for visual observation amongst planetary, lunar and double-star officionados, giving excellent contrast, and "easy to reach" high powers - even with eyepiece designs that, while very sharp, often have uncomfortably short eye relief, and are quite intolerant of "fast" optics. One goal of this F11 planetary telescope is to allow the comfortable use of such eyepieces in their medium focal lengths, whilst controlling aberrations, especially at the field edge. Even "ultrawide" eyepieces perform better, and contribute less colour aberration at the field edge.
Perfect APO colour correction for the demanding visual observer. No colour aberration is visible in or out of focus. Contrast is extraordinary, and the tube baffles have been calculated to block extraneous light. Moreover, the doublet lens design has less glass elements for faster cooldown.
Ready for Binoviewers. The optical tube has a removable rear section just in front of the focuser, which when removed, gives a generous additional 100mm of back-focus. This allows the use of binoviewers and some Hershel Wedges without resorting to a Barlow lens. Binoviewing is very easy - just detach the focuser and unscrew the mid-section, then screw the focuser back into the tube. No tools are required to break the scope down for travel.
Dual speed geared focuser and a light strong mechanics. A new 2023 design dual speed focuser offers tight, repeatable and precise control for observation at high powers, although ironically, finding sharpest focus is much easier with this long focal ratio design than with faster optics. CNC tube rings and a retractable dew shield make this a convenient instrument to use.
Not only for the moon and planets. The high contrast and minimisation of eyepiece aberrations inherent to this design make the 101mm APO a superb choice for double stars and deep-sky objects. Another area to benefit is of course solar observation with a Herschel wedge, or the use of a Daystar Quark, or other Hydrogen Alpha Etalon (with the appropriate ERF Altair Energy Rejection Filter). There are also new opportunities for the solar-modding community, where additional back-focus is often a requirement - afforded by the removable rear extension.
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