Takahashi Multi-Reducer 0.85x-S for FS-60 Series

Product Overview

The S version of Takahashi's 0.85x Multi-Reducer, matched to the FS-60 series: the FS-60CB, FS-60CBX, FS-60CP, FS-60Q and FS-60C. Behind those tubes it gives 300 mm at f/5.0 with a Ø44 mm image circle — full-frame coverage from a 60 mm refractor.

The Multi-Reducer comes in three versions, and the letter is not a size preference — it identifies which telescope family the reducer is computed for. S is the FS-60 series; M is the FCT-65D and FC-50; L is the FC-76 and FC-60/65 series.

Who It's For

This is a good match if you image with an FS-60-series refractor and want a faster, wider system without giving up corner quality.

Key Features & Design

• 300 mm at f/5.0: the resulting configuration on an FS-60 tube.
• Ø44 mm image circle: covers a full-frame sensor.
• Four elements in three groups: a substantial optical design for a reducer of this size.
• M55.9 (P=0.75) telescope side, M52 (P=0.75) camera side.
• Ø60 × 55.8 mm, approx. 215 g.

Optical / Mechanical Design

A 0.85x reduction takes 15% off the focal length and speeds the focal ratio to match — a modest change compared with a 0.6x or 0.7x reducer, and one that keeps the image scale usable rather than collapsing it. The four-element, three-group design is what holds the Ø44 mm circle: it is correcting field curvature across a full-frame sensor at the same time as reducing, which a simpler two-element design would not manage at this speed.

Recommended Uses

Wide-field deep-sky imaging on an FS-60: large nebulae, star fields, and framing that benefits from the extra field and the shorter exposures.

Compatibility and Accessory Notes

Takahashi computes this version for the FS-60CB, FS-60CBX, FS-60CP, FS-60Q and FS-60C. The threads are M55.9 (P=0.75) on the telescope side and M52 (P=0.75) on the camera side. If your telescope is not an FS-60, one of the other two versions is the one you want — the M covers the FCT-65D and FC-50, the L covers the FC-76 series. We stock all three; tell us your telescope and camera and we will confirm the version and the spacing.

Good to Know Before You Order

The letter identifies the telescope, not the length: S, M and L all reduce by 0.85x. Ordering by telescope model rather than by size is the way to get the right one.

An imaging corrector: designed for a camera at the focal plane rather than an eyepiece.

Frequently Asked Questions

Is it difficult to set up?

No — it threads into the train on M55.9 at the telescope and M52 at the camera. Once you have the right version for your tube, the rest is straightforward.

What will my FS-60 become?

300 mm at f/5.0.

Will it cover a full-frame camera?

Yes — Ø44 mm image circle.

How do I know I need the S rather than the M or L?

The S is computed for the FS-60 series. If you have an FCT-65D or an FC-76, you want a different version, and we will confirm it for you.

Bottom Line

The FS-60 version of Takahashi's 0.85x Multi-Reducer — 300 mm at f/5.0 over a full-frame field.