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Takahashi - Mewlon 300 Dall-Kirkham Optical Tube Assembly - DISCONTINUED

Model#: TLK3001

Discontinued Product

Manufactured by: Takahashi

Details

This is a discontinued item. We recommend the AG Optical 12.5" Dall Kirkham Telescope as a replacement.

Takahashi - Mewlon 300 Dall-Kirkham OTA


The Mewlon Series of Dall-Kirkham Telescopes by Takahashi combines refractor-like performance in a larger folded optic reflector design.

The optional NJP mount provides a stable, accurate platform for the M-300. The integral polar alignment telescope and R.A. axis level make accurate polar alignment to within 2 arc minutes of the celestial pole quick and easy. The reticle is designed to be used in either Hemisphere until the year 2030. No other manufacturer uses such a highly accurate polar telescope.

optical tube assembly idk dall kirkham telescope takahashi mewlon 300

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 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.

 


         CAMERA ADAPTERS                            CONFIGURATION

CANON EOS DIGITAL SLR**

 

TMW0004 EOS WIDE MOUNT

T-RING ADAPTER + CAMERA

NIKON DIGITAL SLR

TMW0001 NIKON WIDE MOUNT-T-RING ADAPTER + CAMERA

SBIG CFW-8/9 + ST CAMERA

TCD0012 + CAMERA

SBIG CFW-10 + ST CAMERA

TCD0012L+ CAMERA

SBIG  ST SERIES W/O FILTER

WHEEL/ST-2000

SBIG ST-402ME, 1603, 3200

TCD0327 + CAMERA

 

TCD0385 + CAMERA

SBIG STL CAMERA

SBIG STL + FW8-STL

SBIG ST8300

SBIG ST8300 + FW5 OR FW8

TCD0012STL + CAMERA

TCD0012S + CAMERA

TCD0385 + CAMERA

TCD0165 + CAMERA

FLI CFW 1,2 PROLINE SERIES

FLI CFW 1,2 MICROLINE SERIES

TCD0012FLI-1 + CAMERA

TCD0012FLI-2 + CAMERA

STARLIGHT XPRESS + TRUE

TECH FILTER BOX

TCD0075 + CAMERA

STARLIGHT XPRESS

SXVF H9C OR M25C OR M26C

TCDO385 + CAMERA

QSI 500 SERIES WS & WSI

TCD0204 + CAMERA

QSI 500 SERIES WSG 2.156”

QSI 500 SERIES WSG T-MOUNT

TCD0774 + CAMERA

TCD0001 + CAMERA

LUMENERA SKY nyx

TCD0385 + CAMERA

QHY-8

TCD0350 + CAMERA

ORION STARSHOOT

TCD0327 +  CAMERA

 

  • ADAPTERS AVAILABLE FOR OTHER DIGITAL SLR’s QSI 500

56mm BACK FOCUS: FS-60C FLATTENER AND .73x REDUCER

 

THE 56mm BACK FOCUS IS MEASURED FROM THE REAR OF THE THREADED END OF THE REDUCER /FLATTENER RATHER THAN FROM THE SHOULDER

 

SBIG CFW-8/9 + ST CAMERA

TCD0023 + CAMERA

SBIG CFW-10 + ST CAMERA

TCD0025 + CAMERA

ATIK 383L

TCD0385 + CAMERA

 

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.

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Additional Information

Name Takahashi - Mewlon 300 Dall-Kirkham Optical Tube Assembly - DISCONTINUED
Manufacturer Takahashi
Model TLK3001
Discountinued Yes
Aperture 300mm
Diameter 324mm
Finderscope 11x70 6.3 degree
Focal Length 3572mm / 2739mm w/ reducer
Focal Ratio f/11.9 - f/9.1 w/ reducer
Image circle 25mm / 40mm w/ reducer
Light Gathering Power 1837x
Limiting Stellar Magnitude 14.2
Optical Tube Length 1094mm
Photographic field 45' w/ reducer
Primary Mirror 310mm f/3