Vorion Scientific M54 Male to M54 Female Spacer Adapter – 7.5mm
Precision Backfocus Spacing for Astrophotography
The Vorion Scientific M54 Male to M54 Female Spacer Adapter – 7.5mm
is a fixed-length astronomical extension adapter designed to add
7.5mm of spacing between compatible M54-threaded
components in a telescope imaging system.
Featuring M54 × 0.75 male threading on one side and
M54 × 0.75 female threading on the opposite side, the
adapter provides a convenient way to extend an
astrophotography imaging train while maintaining
the same nominal M54 connection standard.
Proper backfocus spacing is particularly important when
using telescope field flatteners, focal reducers, coma
correctors and other optical accessories that require
a specific distance between the corrective optics
and the camera sensor.
The Vorion Scientific M54 spacer is suitable for
building customized astrophotography configurations
involving compatible astronomy cameras, filter wheels,
filter drawers, off-axis guiders and other threaded
imaging accessories.
Key Features
- 7.5mm Added Spacing: Adds a fixed nominal 7.5mm extension to a compatible threaded imaging train.
- M54 Male-to-Female Connection: Maintains M54 × 0.75 interfaces on both sides.
- Backfocus Configuration: Helps achieve the optical spacing recommended by telescope, reducer and flattener manufacturers.
- Threaded Assembly: Connects compatible components through a mechanical threaded interface.
- Flexible Imaging Integration: Suitable for use between compatible adapters, cameras, off-axis guiders, filter drawers and filter wheels.
- Fixed-Length Design: Provides a predetermined extension without requiring an adjustable spacing mechanism.
- Wide Astrophotography Application: Useful in deep-sky imaging, observatory instrumentation and custom camera assemblies.
- Made in India: Vorion Scientific branded astronomy accessory.
Understanding Backfocus in Astrophotography
Backfocus is an important parameter in astronomical imaging.
For many optical correctors, the manufacturer specifies a
required distance between a particular reference surface
on the corrector and the imaging camera's sensor.
An incorrect spacing distance can contribute to undesirable
star shapes, especially toward the edges of the image,
depending on the optical design.
The total imaging-train spacing may include the camera's
sensor recess, threaded adapters, filter wheels, off-axis
guiders, filter drawers and additional spacer rings.
A fixed-length spacer provides an additional distance
when the existing imaging configuration is shorter
than the required mechanical or optical spacing.
How the 7.5mm Spacer Works
The adapter is installed between two mechanically compatible
M54 × 0.75 threaded components. Its male side connects
to a corresponding female M54 interface, while its
female side accepts a corresponding male M54 interface.
Once installed, the adapter adds a nominal 7.5mm
of axial spacing between the adjoining components.
Because both ends use M54 × 0.75 threading, the adapter
maintains the same nominal thread size rather than
converting to a different thread diameter.
Example Backfocus Calculation
Consider an optical corrector specifying 55mm
of required backfocus. If the existing camera,
filter wheel and other adapters provide
47.5mm of spacing, an additional 7.5mm
spacer can complete the nominal requirement.
Example:
Required backfocus: 55.0mm
Existing imaging-train spacing: 47.5mm
Vorion M54 spacer: 7.5mm
Total nominal spacing: 55.0mm
This example is illustrative. Actual backfocus requirements
and effective spacing may vary depending on the optical
system, reference surfaces, filter thicknesses and
individual component specifications.
Technical Specifications
| Parameter |
Specification |
| Brand | Vorion Scientific |
| Product Name | M54 Male to M54 Female Spacer Adapter |
| SKU | ACC-ADPTR-M54M-M54F-7.5 |
| Product Type | Fixed-Length Astronomical Spacer Adapter |
| Male Thread | M54 × 0.75 |
| Female Thread | M54 × 0.75 |
| Nominal Thread Diameter | 54mm |
| Thread Pitch | 0.75mm |
| Added Spacing | 7.5mm (Nominal) |
| Connection Type | Male to Female |
| Adjustment | Fixed Length |
| Application | Astrophotography Backfocus Spacing |
| Optical Elements | None |
| Power Requirement | None |
| Available Length Options | 7.5mm, 10mm, 16.5mm, 20mm |
| Country of Origin | India |
| Brand Owner | Vorion Scientific Private Limited |
Compatibility
Designed for astronomy equipment featuring compatible
M54 × 0.75 metric threads.
Potential applications include:
- Telescope field flatteners with compatible M54 interfaces
- Focal reducers with compatible M54 interfaces
- Astronomical CMOS and CCD camera adapters
- M54-compatible electronic filter wheels
- M54-compatible filter drawers
- Off-axis guider assemblies with M54 connections
- Custom astrophotography imaging trains
Compatibility Note:
M54 thread compatibility alone does not guarantee compatibility
with every imaging configuration. Confirm thread pitch,
male/female orientation, available thread engagement,
mechanical clearance and the required optical spacing.
Applications
- Deep-sky astrophotography
- Backfocus correction and spacing configuration
- Camera-to-flattener spacing
- Camera-to-reducer spacing
- Filter wheel and filter drawer integration
- Off-axis guider spacing adjustments
- Scientific imaging system assembly
- Custom astronomical camera adapters
Installation Guidelines
- Verify that the connecting components use M54 × 0.75 threading.
- Determine the additional spacing needed for your imaging configuration.
- Connect the male M54 side to a compatible female M54 interface.
- Connect the female M54 side to a compatible male M54 interface.
- Ensure both threaded connections engage smoothly without cross-threading.
- Secure the assembly without excessive tightening.
- Check that all components have sufficient clearance and that the camera is adequately supported.
- Confirm the final imaging-train spacing before imaging.
Frequently Asked Questions
What is the purpose of this M54 spacer?
It adds a nominal 7.5mm of spacing between two compatible
M54 × 0.75 threaded components in an imaging train.
Does it change the telescope focal length?
No. The spacer has no optical elements and does not
directly change the telescope's focal length or magnification.
However, changing spacing behind an optical corrector
can influence its correction performance.
Can it be used with ZWO, QHYCCD or other astronomy cameras?
Yes, where the complete adapter configuration provides
compatible M54 × 0.75 male and female interfaces
and the required spacing.
Direct compatibility depends on the camera's actual
threading and installed adapters.
Can multiple spacers be combined?
Yes, compatible M54 male-to-female spacers can be stacked
to obtain a different nominal extension, subject to
adequate thread engagement, mechanical rigidity
and available clearance.
Is this an adjustable spacer?
No. This model provides a fixed nominal 7.5mm
extension and does not include a variable-length
adjustment mechanism.
Important Notes
- This product is a mechanical threaded spacer and contains no optical or electronic components.
- Confirm the required spacing from the optical equipment manufacturer's documentation.
- Ensure that the mating components use the correct M54 × 0.75 threads.
- Other cameras, correctors, filter wheels and accessories are not included.
- The 7.5mm value is nominal; consult Vorion Scientific for measured tolerances when precision-critical.
Vorion Scientific Private Limited
Astronomy Equipment, Astrophotography Accessories
and Observatory Solutions
Made in India
