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Pegasus Astro Adapter M54 Male to 2'' Nosepiece
This Pegasus Astro Adapter M54 Male to 2" Nosepiece provides a robust connection with a total length of 35mm, consuming only 1.5mm of precious back focus. It is designed to mount any accessory with a female M54 thread into a standard 2" focuser or visual back, and includes an internal M48 thread for direct mounting of 2" filters.
Secure Your M54 Accessories with Just 1.5mm of Back Focus
Engineered for imagers working with tight back focus tolerances, this adapter converts the male M54 thread common on flatteners, rotators, and off-axis guiders to a standard 2" nosepiece. The adapter flange itself is only 1.5mm thick, ensuring it adds almost no length to your optical train while the full 35mm barrel provides a secure, non-tilting seat inside the focuser drawtube.
Integrated M48 Filter Cell for 2" Filters
The nosepiece features an internal M48x0.75 thread, allowing you to attach standard 2" filters directly to the adapter. This is the most efficient way to place a light pollution or narrowband filter at the front of your imaging train, saving you the expense and back focus of a separate filter drawer or wheel, especially in minimalist setups.
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What is the Pegasus Astro M54 to 2" adapter used for?
This adapter is designed to connect astronomy accessories that have a female M54x0.75 thread (like the Pegasus Astro Falcon Rotator or certain field flatteners) to a standard 2" focuser, diagonal, or other 2" receptacle on a telescope.
How much back focus does the M54 adapter consume?
The adapter flange has a thickness of only 1.5mm. This is the total amount of back focus it will add to your imaging train, making it ideal for systems where every millimeter counts.
Can I use 2" filters with this M54 adapter?
Yes. The inside of the 2" nosepiece is threaded for standard M48x0.75 filters. This allows you to screw a 2" filter directly into the adapter, placing it at the front of your imaging train before the light path enters your other accessories.
How do I attach this adapter to my Pegasus Astro Falcon Rotator to use it with my refractor's 2" focuser?
You would thread the M54 male side of this adapter into the female M54 telescope-side connection of the Falcon Rotator. The 2" nosepiece can then be inserted directly into your refractor's 2" focuser and secured with the compression ring or set screws.
What is the total length of the Pegasus Astro M54 nosepiece?
The total length of the nosepiece portion that inserts into a focuser is 35mm. This provides ample surface area for a secure, tilt-free connection.
Will this adapter work with accessories that are not from Pegasus Astro?
Yes, absolutely. As long as your accessory uses a standard female M54x0.75 thread and you need to connect it to a 2" port, this adapter will work perfectly, regardless of the manufacturer.
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| Total Nosepiece Length |
35mm |
| Adapter Thickness (Back Focus) |
1.5mm |
| Filter Threads |
M48x0.75 (for 2" Filters) |
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Adapter M54 Male to 2'' Nosepiece
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Pegasus Astro 2-Year Warranty
