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A 1.5x extender is being introduced to compliment the usefulness of the MewlonCR corrector. Now the Mewlon can be viewed as a tri-focal device with corrected fields at three different focal ratios.
Mewlon-CR 250 for μ-250
Extender-CR
Effective focal ratio f/15
Effective focal length 3780mm
Image circle 44mm ø
Imaging circle .66º
Mewlon-CR for μ-300
Extender-CR
Effective focal ratio f/14.9
Effective focal length 4475mm
Image circle 44mm ø
Imaging circle 0.56º