Takahashi Universal Rack and Pinion Focuser 50.8mm (Mewlon / CN)

Product Overview

Takahashi's universal rack-and-pinion focuser in its 50.8 mm form, listed for the Mewlon and CN series. 50.8 mm is the 2″ format — the size most modern eyepieces, diagonals and camera adapters are built to, which makes this the version to choose if your accessories are not on Takahashi's own 36.4 mm thread.

A rack-and-pinion focuser drives the drawtube on a toothed rack rather than a friction roller, which is what lets it hold a load without slipping — the reason it suits a Cassegrain carrying a diagonal and eyepiece or a camera at the back.

Who It's For

This is a good match if you run a Mewlon or CN series telescope with 2″ eyepieces or a modern imaging train and want the focuser sized to match.

Key Features & Design

• 50.8 mm (2″) drawtube: the standard format for modern eyepieces and imaging accessories.
• Rack-and-pinion drive: positive engagement that holds position under load.
• Listed for Mewlon and CN: one of four versions in this focuser range.

Recommended Uses

Visual observing with 2″ eyepieces and deep-sky or planetary imaging on a Mewlon or CN series telescope.

Compatibility and Accessory Notes

Takahashi builds this focuser in four combinations: 36.4 mm and 50.8 mm drawtube sizes, each in a Mewlon-250 version and a Mewlon/CN version. We stock all four. Tell us your exact telescope and what you are putting behind the focuser and we will confirm which of the four you want.

Good to Know Before You Order

Four versions exist: two drawtube sizes across two telescope fittings. Matching both is what gets the right part, and we will check it with you.

Mewlon/CN or Mewlon-250: Takahashi lists a separate version specifically for the Mewlon-250. If that is your telescope, the other one is likely the one you want — worth confirming with us either way.

We are still waiting on a product photo: Takahashi's listing carries no image for this focuser, so the page shows none rather than a picture of a different version. Ask us and we will photograph or describe the item in stock.

Frequently Asked Questions

Is it difficult to set up?

Fitting a focuser is more involved than adding an accessory — it mounts to the telescope's rear cell. If you would rather not do it yourself, talk to us before you order.

What does 50.8mm refer to?

The drawtube size — 50.8 mm is 2″, the standard modern format.

Which telescopes is it for?

The Mewlon and CN series. The Mewlon-250 has its own listed version.

Should I get 50.8mm or 36.4mm?

If your eyepieces and adapters are 2″, this one. If you are running Takahashi's own visual accessories on their native thread, the 36.4 mm version.

Bottom Line

The 2″ rack-and-pinion focuser for Mewlon and CN telescopes — the version that matches modern eyepieces and imaging trains.