Takahshi has been producing the Mewlon-250 and 300 Dall-Kirkham reflectors for 20 years. They have proven to be excellent visual telescope and small field imaging instrument when used with the dedicated reducer/flattener.

Now, Takahashi has developed in line triplet ED corrector for the Mewlon-250 and 300. These proprietary correctors eliminate off-axis coma, flatten the field and slightly reduce the focal length for these telescopes. The result is a system to offer corrected fields at three different focal lengths. This tri-focal system can make every Mewlon-250 and 300 into excellent versatile imaging and visual telescopes.  They are f/10, f/7.3 or f/15 depending upon the configuration used. This tri-focal potential will cover a variety of imaging needs with just one instrument.

The corrector is permanently located in the baffle tube which is easily exchanged by the user. It produces a 44mmø circle perfect for imaging or observing. Or it can be ordered in a new Mewlon-CR 250 or  Mewlon-CR300.

Augmenting the Mewlon CorrectorCR is the 0.73 ReducerCR and 1.5x ExtenderCR. Each enhances the MewlonCR System. The ReducerCR changes the μ-250 to an f/7.3 wider field imager yet with the larger image scale for larger objects. While the ExtenderCR produces a very large image scale for the very small objects.

Stellar sizes in the center are 2 microns for the C-F line and 3 microns for the g line, well beyond the diffraction limit. This image size is suitable for any CCD camera or digital SLR with an appropriate sized sensor.

MEWLON 300 CORRECTOR INSTRUCTION MANUAL

Mewlon-CR 250 for μ-250

Effective focal ratio                f/10
Effective focal length              2500mm
Image circle                            40mm ø
Imaging circle                         0.92º
Metal back distance**           115.5mm
Back focus                              180.5

** Optimum imaging back focus as measured from the rearmost surface of the optical device used that will make contact with the next adapter in the imaging train. [This is a critical distance for optimum imaging]

 
Reducer-CR 0.73x

Effective focal ratio                f/7.3
Effective focal length              1825mm
Image circle                            35mm ø
Imaging circle                         1.1º
Metal back distance**          72.8mm

 
Extender-CR 1.5x

Effective focal ratio                f/15
Effective focal length              3780mm
Image circle                            44mm ø
Imaging circle                         .66º
Metal back distance**           117.5mm
Back focus                              200.05mm


Mewlon-CR for μ-300

Effective focal ratio                f/9.9
Effective focal length              3780mm
Image circle                            40mm ø
Imaging circle                         0.77º
Metal back distance**           189.5mm
Back focus                              200.5mm

 
Reducer-CR 0.73x

Effective focal ratio                f/7.2
Effective focal length              2160mm
Image circle                            35mm ø
Imaging circle                         0.92º
Metal back distance**           72.8mm]

 

Extender-CR 1.5x

Effective focal ratio                f/14.9
Effective focal length              4475mm
Image circle                            44mm ø
Imaging circle                         0.56º
Metal back distance**           117.5