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Takahashi Mewlon 250CRS Corrected Dall Kirkham Telescope OTA
Takahashi Mewlon 250CRS Corrected Dall Kirkham Telescope OTA

Takahashi Mewlon 250CRS Corrected Dall Kirkham Telescope OTA

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Part Number:TLK25300

Choose Options or Accessories if Applicable

Focusers, Extenders & Reducers
Flatteners & Correctors
Finder Scopes & Brackets
TKA00551 6X30 Finderscope (+CAD319.00)
TKA00552 7X50 Finderscope (+CAD559.00)
TKA00552Y 7X50 Finderscope (Yellow) (+CAD609.00)
TKA00562 6X30 FINDER BRACKET (+CAD99.00)
TKA00563 7X50 FINDER BRACKET (+CAD159.00)
TKA00562BB 6X30 FINDER BRACKET (Blue Black) (+CAD89.00)
TKA00563BB 7X50 FINDER BRACKET (Blue Black) (+CAD179.00)
TKA00569 7X50 FINDER BRACKET (CCA-250) (+CAD149.00)
SBP08110 Starbase 80 6x30 finder w/brakcet (+CAD109.00)
Tube Holders
Eyepiece Accessories
Camera Angle Adapters & T-rings
Simulate views with this scope and various eyepieces help
When Takahashi developed the correctors for their Mewlon line of telescopes it meant that 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. Takahashi developed the secondary focusing system in 1990 and wanted to improve them with computer control. An ASCOM driver is available for download free from Takahashi Japan website. 

The CRS Mewlons are the product of this development. They both employ an ASCOM compliant driven secondary focusing motor that allows the Active Focus system to be controlled by an ASCOM compliant focusing system. 

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. This can be done manually or controlled by an ASCOM compliant focusing program. 

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 the 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 optionally for added flexibility. 

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

NameTakahashi - Mewlon 250CRS Dall-Kirkham Optical Tube Assembly
Manufacturer Takahashi
Model TLK2502
Manufacturer Part No 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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