Takahashi Reducer-CR 0.73x for Mewlon CRS, CCA-250 and FSQ-106EDX4

Product Overview

The Reducer-CR 0.73x is Takahashi's focal reducer for the CCA-250 and the Mewlon-250CRS and Mewlon-300CRS Cassegrains, trading some of each telescope's long native reach for a meaningfully faster, more deep-sky-friendly focal ratio. On the CCA-250 it brings the system down to f/3.6; on the Mewlon-250CRS and Mewlon-300CRS, to f/7.3 and f/7.2 respectively.

Who It's For

This is a good match if you own a CCA-250, Mewlon-250CRS, or Mewlon-300CRS and want a faster system for deep-sky imaging than the native long-focus Cassegrain configuration provides.

Key Features & Design

• Shared across three Cassegrains: one part, with the resulting focal length and ratio set by which telescope it is mounted on.
• Meaningful speed gain: the CCA-250 goes from f/5.0 native to f/3.6; the Mewlon CRS pair drop from roughly f/10 native into the f/7 range.
• 38–35mm image circle depending on host telescope, with a matched back focus for each.

Optical / Mechanical Design

The CCA-250, Mewlon-250CRS, and Mewlon-300CRS are Dall-Kirkham and related Cassegrain designs built natively for long-focus planetary and lunar work. The Reducer-CR 0.73x shortens the effective focal length on each by roughly the same 0.73x factor, but because their native ratios differ, the resulting speed gain is most dramatic on the CCA-250 (f/5.0 to f/3.6) and more moderate on the two Mewlon CRS models (f/9.9–f/10.0 down to roughly f/7.2–f/7.3).

Recommended Uses

Faster deep-sky imaging on the CCA-250, Mewlon-250CRS, or Mewlon-300CRS — galaxies, planetary nebulae, and globular clusters where the native long-focus configuration would otherwise demand long exposures.

Compatibility and Accessory Notes

Takahashi publishes this reducer for three telescopes, with a fourth pairing available through an additional adapter.

Takahashi also lists this reducer as compatible with the FSQ-106EDX4 when used with the separate CA35 (SKY90)-style adapter, part TKA35201. The same three Cassegrains also take the companion Mewlon CR Extender 1.5x, which Ontario Telescope carries separately, for the opposite trade-off. See the Takahashi Back Focus Guide for spacing detail.

Good to Know Before You Order

FSQ-106EDX4 use needs a separate adapter (TKA35201).

Frequently Asked Questions

Is it difficult to set up?

No — it threads to the rear cell with a fixed back focus on each host telescope, so there is no spacing to work out on the CCA-250 or Mewlon CRS pairings.

What is it best used for?

Faster deep-sky imaging on the CCA-250, Mewlon-250CRS, or Mewlon-300CRS.

Does the same part fit all three Cassegrains?

Yes — one reducer, with a different resulting focal length, ratio, and image circle depending on the host telescope.

Can I use it on my FSQ-106EDX4?

Takahashi notes compatibility with a separate adapter (TKA35201).

Bottom Line

The Reducer-CR 0.73x speeds up the CCA-250, Mewlon-250CRS, and Mewlon-300CRS for deep-sky imaging — down to f/3.6 on the CCA-250 and into the f/7 range on the Mewlon CRS pair — and extends to the FSQ-106EDX4 with an additional adapter.