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Takahashi - Mewlon 250 10" f/12 Dall-Kirkham Telescope - (EM-200 Temma II Mount)

Model#: TLS2146

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$15,499.00

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Manufactured by: Takahashi

Details

TAKAHASHI  Mewlon 250mm Dall-Kirkham Reflector with EM-200 Temma II Mount and SE-L Tripod - PACKAGE 
The Mewlon Series of Dall-Kirkham Telescopes by Takahashi combines refractor-like performance in a larger folded optic reflector design. The Mewlon series of Dall-Kirkham Cassegrain telescopes from Takahashi offer the experienced observer a level of performance and portability not found in other Cassegrain telescopes.  Classical Cassegrain telescopes offer excellent performance but they are extremely expensive to produce at large apertures. By concentrating on the Dall-Kirkham Cassegrains, the Mewlon offers a professional level of performance within reach of most amateurs.

The Mewlons use an ellipsoidal shape on the primary mirror and a spherical configuration on the secondary. By focusing on very tight tolerances for these surfaces, Takahashi is able to deliver a compact telescope with reasonable aperture and extremely high resolution. Where fast F/ratios are not required, the F/12 Mewlons provide excellent contrast by utilizing a smaller secondary mirror than comparable Cassegrain designs. Secondary obstruction as a percentage of diameter is 29-31% on the Mewlons. Classical Cassegrain telescopes usually have secondary obstruction of 32% or greater. Commercial Schmidt-Cassegrains have secondary obstructions of approximately 38% for F/10 systems. Ritchey-Chretien Cassegrains have even more secondary obstruction making them less suitable for visual, high contrast applications.

Takahashi uses extensive knife-edge baffling to minimize stray-light reflections as well as a specially designed tube that also acts as a light baffle. The result is an instrument that rivals fine long-focus Newtonians or APO Refractors for contrast and sharpness. Some opticians have criticized the Dall-Kirkham design as having unacceptable coma. With most eyepieces (including Panoptics & Naglers) the coma is negligible and well outside the field of view. Stars are much smaller and sharper than in commercial Schmidt-Cassegrains. Coma may be a problem for wide-field astro-imaging, but these instruments were not designed for such tasks. With Takahashi's field flattener/reducer, these telescopes offer superb off-axis images at F/9.

The 250mm and 300mm models have electronic focusing accomplished by moving the secondary mirror. This eliminates the image-shift problem inherent to commercial Schmidt-Cassegrains with moving primary mirrors. Because of the loose tolerances required in moving large and heavy mirrors on a baffle tube, most SCT's will not maintain perfect collimation. Image quality is then compromised in such optical systems. The large Mewlons also have removable covers for their primary mirror cells that aids in rapid mirror cooling so that the observer can take advantage of favorable seeing conditions more quickly. These features make the large Mewlons ideal for high-resolution CCD imagery.

With the Mewlon series, one doesn't have to sacrifice optical performance for high portability. The Mewlon 250 weighs only 28lbs (12.7kg) and is remarkably compact for a 10" Cassegrain. This instrument is highly portable and offers deep sky views that are exceptional. On the planets, many observers have reported seeing details they thought impossible with telescopes of this aperture. With the exception of a few diffraction spikes around bright stars, one might believe they were observing with a large apochromatic refractor. The advantage, though, is a greater amount of light grasp and resolution than a comparably priced refractor. Indeed, the Mewlons offer an exceptional value in their aperture class.

In short, the Takahashi Mewlon 250 is a  professional grade instrument in a compact, lightweight package offering no compromise in its large aperture light grasp ability for crisp detail and contrast. 
 

 This Package also Includes a TAKAHASHI  EM-200 Temma 2  GEM GoTo Mount and a TAKAHASHI SE-L Mahagony Tripod

The TAKAHASHI  EM-200 Temma 2 is an accurate, precision-built  GoTo German equatorial mount that provides a stable platform for payloads of up to 30 pounds. The modern aesthetic design of the EM-200 is highly attractive as well as beautifully functional. The RA and DEC stepper motors are fully integrated into the mounting,and the high precision design and construction provides cyclic errors lower than +/- 5 arc seconds.

The integrated polar alignment telescope has an illuminated reticule which can be dimmed to suit the user or observing conditions. In conjunction with the precision altitude and azimuth adjusters, this will typically give polar alignment accuracy within 2 minutes of arc of the celestial pole.

Included in this package are an RS232C cable, ST-4 or ST-7 cable, shaft encoders, hand controller, power cord for both 12V and 24V operation, and software.
The new style EM-200 mounts include the ability for operation on 12v or 24v and feature high speed slewing at 350x [sidereal rate] at 12v and 700x at 24v.  12V operation takes place with the use of the hand controller only. The mount will then function just like the EM-200 USD model (no GoTo functions).  However, with the use of the hand controller and your PC, you can operate with 12V or 24V (two 12V batteries connected in series). 12V will give you a slewing speed of up to 350X sidereal, and 24V will produce slew speeds of up to 700X. A PC or Takahshi Advanced Temma Hand Control is required to actuate the GoTo functions on this mount.   A dual-axis hand controller and power cable for 12V/220V battery connection is included.

  • Takahashi Wood Tripod Made of Luan Mahogany; 
  • Tripod Leg Length is 50.39"(1280mm);
  • Set Up Height is 44.88"(1140mm); 
  • Height to Base of Dec Assy of EM-200 Mount is 56.39"(1430mm); 
  • Used with EM-200 Mount Only
  • Genuine Shimano Clamps




MC

Product Series

The Mewlon series of Dall-Kirkham Cassegrain telescopes from Takahashi offer the experienced observer a level of performance and portability not found in other Cassegrain telescopes mass produced for amateurs. Classical Cassegrain telescopes offer excellent performance but they are extremely expensive to produce at large apertures. By concentrating on the Dall-Kirkham Cassegrains, the Mewlon offers a professional level of performance within reach of most amateurs.

The Mewlons use an ellipsoidal figure on the primary mirror and a spherical figure on the secondary. By focusing on very tight tolerances for these surfaces, Takahashi is able to deliver a compact telescope with reasonable aperture and high resolution. Where fast F/ratios are not required, the F/12 Mewlons provide excellent contrast by utilizing a smaller secondary mirror than comparable Cassegrain designs. Secondary obstruction as a percentage of diameter is 29-31% on the Mewlons. Classical Cassegrain telescopes usually have secondary obstruction of 32% or greater. Commercial Schmidt-Cassegrains have secondary obstructions of approximately 38% for F/10 systems. Ritchey-Chretien Cassegrains have even more secondary obstruction making them less suitable for visual, high contrast applications.

Takahashi uses extensive knife-edge baffling to minimize stray reflections as well as a specially designed tube that also acts as a light baffle. The result is an instrument that rivals an excellent long-focus Newtonian or refractor for contrast and sharpness. Some opticians have criticized the Dall-Kirkham design as having unacceptable coma. With most eyepieces (including Panoptics & Naglers) the coma is negligible and well outside the field of view. Stars are much smaller and sharper than in commercial Schmidt-Cassegrains. Coma may be a problem for wide-field astro-imaging, but these instruments were not designed for such tasks. With Takahashi's field flattener/reducer, these instruments offer superb off-axis images at F/9.

The 250mm and 300mm models have electronic focusing accomplished by moving the secondary mirror. This eliminates the image-shift problem inherent to commercial Schmidt-Cassegrains with moving primary mirrors. Because of the loose tolerances required in moving large and heavy mirrors on a baffle tube, most SCT's will not maintain perfect collimation. Image quality is then compromised in such optical systems. The large Mewlons also have removable covers for their primary mirror cells, this aides in rapid mirror cooling so that the observer can take advantage of favorable seeing conditions more quickly. These features make the large Mewlons ideal for high-resolution CCD imagery.

With the Mewlon series, one doesn't have to sacrifice optical performance for high portability. The 8.3" Mewlon 210 weighs just 18lbs (8.2kg) with a 7x50 finder attached. The Mewlon 250 weighs only 28lbs (12.7kg) and is remarkably compact for a 10" Cassegrain. Both of these instruments are highly portable and offer deep sky views that are exceptional. On the planets, many observers have reported seeing details they thought impossible with telescopes of this aperture. With the exception of a few diffraction spikes around bright stars, on might believe they were observing with a large apochromatic refractor. The advantage, though, is a greater amount of light grasp and resolution than a comparably priced refractor. Indeed, the Mewlons offer an exceptional value in their aperture class.

So if you desire a professional grade instrument in a compact, lightweight package or are tired of compromising light grasp for crisp detail and contrast, check out the Mewlon Cassegrains by Takahashi. You will be pleasantly surprised by their performance. For further analysis of the Takahashi Mewlon Series of Dall-Kirkham Cassegrains, please read Jean Dragesco's review in his book High Resolution Astrophotography, Cambridge University Press, 1995.

Additional Information

Name Takahashi - Mewlon 250 10" f/12 Dall-Kirkham Telescope - (EM-200 Temma II Mount)
Manufacturer Takahashi
Model TLS2146
Azimuth Adjustment 30'
Counterweights 2 - 5kg
DEC Slow Motion Axis Motor Driven
Diameter 280mm
Finderscope 7x50 6.3°
Focal Length 3000mm/2307mm w/reducer
Focal Ratio F/12-F/9.2 w/reducer
Image circle 21mm/'42mm w/reducer
Light Gathering Power 1275x
Limiting Stellar Magnitude 13.8
Motor Drive Sidereal rate N/S switching
Mount Weight 56.2 lbs (includes counterweights)
Optical Tube Length 850mm
Optical Tube Weight 27.5 Ibs
Payload Capacity 35.2 lbs
Photographic field 1.0° w/reducer
Primary Mirror 260mm F/3
R.A. Slow Motion Axis Motor Driven
Secondary Mirror Obstruction 29%
Slew Speeds 0.05x--2x RA, 0-15 arc/sec DEC, High Speed Mode: 2X - 16X RA, High Speed Mode: 30-240 arc/sec DEC
Tracking Rates 5 arc seconds accuracy