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This pier has been discontinued by Takahashi and OPT is out of stock. We are sorry for the inconvenience. Takahashi CN-212 - 8.35" Cassegrain/Corrected Newtonian Telescope
 Are you ready for a design so unique that it could have only come from the minds at Takahashi? Then take a look at the Takahashi CN-212 8.35" Cassegrain/Corrected Newtonian Telescope, because it is two telescopes in one. Takahashi starts on the outside with a high quality aluminum telescope tube that measures 34" (855mm) long, 9.6" wide and weighs around 15 pounds with no secondary - but it's what goes inside that counts - engineering that has been dreamed of, but never before commercially available. Let's begin with a 820mm parabolic primary mirror with a fast focal ratio and a Cassegrain style opening cut into its center. For reflector fans who center mark their mirror for collimation purposes, you know this sweet spot! This directs the light back up to the four vane spider assembly which holds the secondary mirror - and here's where your choice of configurations comes into play....
 There's a 68mm diameter hyperbolic secondary mirror that comes with the Takahashi CN-212, with its own special tapered fitting that slides right into the spider vane assembly just like docking your own personal space ship. Once in place, the hyperbolic secondary will turn the CN212 into a Cassegrain-style telescope with a focal ratio of f/12.4 and a focal length of 104.3" (2650mm). This will deliver a 0.8° image field and 36" (914mm) image circle. That means you're ready for some great high magnification imaging applications - or some very serious high resolution visual studies. With 0.55 arc seconds of capability, the rings of Saturn are going to look like a phonograph record and demanding double stars will yield their secrets. You'll see finer details on Jupiter and the lunar surface than you'd ever dreamed imaginable and star clusters will become pinpoint palettes of diamond dust.
But, there's more...
 Now, let's remove the hyperbolic secondary and replace it with the 72mm elliptical flat diagonal and transform the Takahashi CN-212 into a Newtonian reflector telescope. Instead of the light being focused toward the back of the tube, it is now directed towards the side. Attach the low profile 2" eyepiece adaptor and coma corrector/field flattener lens and you now have f/3.9 reflector with a focal length of 32.3" (820mm). It will yield a photographic field of 2.9° with an image circle of 43" (1092mm). That 212mm will really come into play here as the sky yields up bright images of nebula and galaxies - one capable of totally unvignetted 35mm photography. Can you imagine seeing all of the Andromeda Galaxy at once? Or the power and beauty of the Orion Nebula with the field around it? Large subjects like the Pleiades, Lagoon Nebula and more are waiting to be discovered. This is the outstanding beauty of a fast reflector telescope. Extended objects such as large star clusters, comets, nebula and galaxies will come to life like you've only seen them through large aperture - yet you still retain the incredible resolution factor.
 Having two telescope in one isn't for everyone and does require some basic telescope experience to make the switches - but not an engineering degree. Takahashi has made switching between configurations as technically simple and efficient as possible by designing each mirror cell with a tapered fitting that slides into the corresponding funnel fitting in the secondary spider. This design has made it so the critical angle and centering is achieved every time - without stressful reconfigurations on the part of the user. There's a special pin that fits right into the spider that assures you have the right rotation and an ergonomic thread-on ring locks it all securely into place. It's as easy as one, two, three! Once in place, you're ready to align the markings for your initial collimation and using the provided collimation tool, do your final critical alignments to assure perfect images - both visual and in astrophotography applications.
 Once you've decided what configuration to use on your Takahashi CN-212 - 8.35" Cassegrain/Corrected Newtonian Telescope, then it's time to go to the Takahashi 7X50 finderscope and its generous 6.3º field of view. This size means you won't be struggling to find your target and a surprising amount of the Messier objects and NGCs can be seen right in the crosshairs from a dark sky site. Once you're centered, it's time to go to the focuser knob located on the die-cast rear focusing cell. This moves both backwards and forwards in 1mm increments, providing smooth, accurate focusing in both the cassegrain and newtonian configurations. The backfocus is a sweet, long 8.25" (210mm) - which is ample room to allow you to incorporate your highest magnifications, binocular viewers and CCD imaging equipment. When fully set up as a Cassegrain model, the Takahashi CN212 weighs in at 18.5 lbs and 19.8 lbs. when in the Newtonian mode. It's highest practical magnification can be achieved when used as a Cassegrain and stands at about 438x and it has a light gathering power of 917x. Whether you choose to use it as a high power study tool, an astro-imaging scope, or your own personal cosmic voyager is up to you. But...
Takahashi quality shines through.
Takahashi CN-212 - 8.35" Cassegrain/Corrected Newtonian Telescope Features...
- Cassegrain configuration delivers a focal ratio of f/12.4 and a focal length of 104.3" (2650mm).
- Newtonian configuration delivers a focal ratio of f/3.9 and a focal length of 32.3" (820mm).
- Cassegrain configuration delivers an image circle of 36" (914mm) and a photographic field of 0.8°.
- Newtonian configuration delivers an image circle of 43" (1092mm) and a photographic field of 2.9°.
- Perfect for all astronomy applications - from high magnification lunar and planetary work to low power wide field imaging.
- Capable of supporting CCD imaging equipment, medium format, film format, binoviewers and more.
- Full Five Year Takahashi Warranty.
Takahashi Product Number: TNK2120
Important Note: Takahashi America requires that their telescope optical tube assemblies be shipped via 2nd Day Air or faster in order for the full warranty to be in force. Please make sure you choose the appropriate shipping method in your shopping cart or, if you speak to an OPT associate, request 2nd Day Air or faster. If you are purchasing a telescope and mount package, it would be best to contact OPT for a shipping quote, since the mount can go Ground if you like, but the OTA is required to ship at least 2nd Day Air. Thank you!
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