Player One M54M-M68F 17.5mm Extender

Overview

The Player One M54M-M68F 17.5mm Extender is a machined spacer with an M54×0.75 male thread on one end and an M68 female thread on the other, adding 17.5 mm to the optical path. It is a purely mechanical part with no glass and no electronics, made from aluminum 6061-T6.

Who It's For

This is a good match if you are bridging an M54 section of an imaging train to an M68 interface — such as a large flattener or telescope rear thread — and need 17.5 mm of length to reach a target backfocus.

Key Features & Design

• M54 male to M68 female: M54×0.75 male on one end, M68 female on the other.
• 17.5 mm spacing: adds a fixed 17.5 mm to the optical path.
• Aluminum 6061-T6 body: light, corrosion-resistant, and dimensionally stable.
• Fully mechanical: no optical elements and no electrical connection.

Recommended Uses

Use it to step an M54 imaging train up to an M68 interface while adding 17.5 mm of spacing, for example between a camera-side M54 train and an M68 flattener or telescope adapter.

Compatibility & Accessory Notes

The extender presents an M54×0.75 male thread on one side and an M68 female thread on the other. Because it is a fixed-length spacer, include its 17.5 mm in your total backfocus calculation. If you want to confirm the M68 thread matches your flattener or telescope, send us the model and we will check it with you.

Good to Know Before You Order

• Mechanical spacer only: it carries no optical elements and passes no electronic signal.
• Fixed 17.5 mm length: the spacing it adds is set and not adjustable.
• Thread conversion: it converts M54 male to M68 female, so both mating parts need the matching threads.

Frequently Asked Questions

Is it difficult to set up?

No — it threads into an M54 male and an M68 female interface by hand and needs no tools or adjustment.

What is it best used for?

Bridging an M54 imaging train to an M68 interface while adding a fixed 17.5 mm of spacing.

Does it contain any optics?

No. It is a bare mechanical spacer with no lenses or coatings.

How much backfocus does it add?

17.5 mm, which you should include in your spacing total.

Bottom Line

In short: a machined aluminum M54 male to M68 female spacer that adds a fixed 17.5 mm to the optical path, for bridging M54 and M68 sections of an imaging train.