Takahashi's New ED Corrector

[norcaltakguy (James Edwards)]

Hello all you Takahashi users! I thought you all might be interested in Tak's new ED Corrector for the M250 and 300's! All I can say is, WOW !!!

μ-250CR Corrector System

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-CR 250 for μ-250

Effective focal ratio f/10
Effective focal length 2500mm
Image circle 44mm ø
Imaging circle 1º
Reducer-CR 0.73x

Effective focal ratio f/7.3
Effective focal length 1825mm
Image circle 35mm ø
Imaging circle 1.1º

Extender-CR

Effective focal ratio f/15
Effective focal length 3780mm
Image circle 44mm ø
Imaging circle .66º

Mewlon-CR for μ-300

Effective focal ratio f/9.9
Effective focal length 3780mm
Image circle 40mm ø
Imaging circle 0.77º

Reducer-CR

Effective focal ratio f/7.2
Effective focal length 2960mm
Image circle 35mm ø
Imaging circle 0.92º

Extender-CR

Effective focal ratio f/14.9
Effective focal length 4475mm
Image circle 44mm ø
Imaging circle 0.56º


James Edwards
Elk Grove CA, USA