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Takahashi - Mewlon 250CRS Dall-Kirkham Optical Tube Assembly

  • Takahashi - Mewlon 250CRS Dall-Kirkham Optical Tube Assembly
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Product Description

Note: The picture shows the Mewlon 250CRS with a mount and tripod, but this package includes the Optical Tube Assembly only.


Takahashi Mewlon 250CRS Dall-Kirkham Optical Tube Assembly



When Takahashi developed the Mewlon Correctors it meant any Mewlon-250 or 300 ever made could be converted into a flat field corrected telescope. This 3-element ED corrector allowed the Mewlon to be used as an imaging instrument or used as a corrected visual instrument capable of producing flat-field corrected views of the Moon, planets and deep space objects. The 250/300 Mewlons use an electric focus controller that moves the secondary mirror. Takahshi developed the secondary focusing system in 1990 and wanted to improve them with computer control.

The CRS Mewlons are the product of this development.

Additionally, to make imaging easier a 3-fan cooling system is included. This system uses three sensors: one on the mirror, a second in the tube and a third outside to monitor and control the low vibration fans to bring the primary to ambient temperature.

The cooling system is controlled manually or automatically with the hand control. When the sensors read a difference in the temperature of the primary and ambient temperature the fans turn on and cool until primary is brought to ambient.

The provided hand control is used for manual focusing and cooling and as a connector for the computer controlled focusing program.

The USB port is used for the connection to the computer for auto focusing.

The auto focusing system is called Active Focus. Active Focus includes a backlash revision function.

The M-250CRS uses a four vane spider to support the pulse motor focusing system. It can be controlled with FocusMax, Maxim DL or similar software.


The M-250CRS is an outstanding medium sized flat field imaging and visual instrument. It weighs 22lbs so it is portable and does not require a large mount to operate, so it can be easily transported to remote sites.

A dedicated f/7.3 reducer and 1.5x extender are available for added flexibility.

A 7x50 illuminated reticle finder and tube holder are standard.

Name Takahashi - Mewlon 250CRS Dall-Kirkham Optical Tube Assembly
Manufacturer Takahashi
Model TAK-TLK25300
Manufacturer Part # TAK-TLK2502
Telescope Aperture 8.1" - 10"
Aperture ø250mm
Finderscope 7 x 50 Optical Finder
Focal Length 2500mm
Focal Ratio f/10
Focuser Driven Secondary with Active Focus
Highest Useful Magnification 600x
Image circle 40mm
Limiting Stellar Magnitude 13.8
Optical Design Corrected Dall-Kirkham
Optical tube diameter ø280mm
Optical Tube Length ø21mm/ø42mm
Optical Tube Weight 26.4 Ibs

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