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Imaging Train

The imaging train is the stack of parts between the telescope's corrector and the camera sensor: adapters, spacers, a filter wheel or drawer, an off-axis guider, sometimes a rotator or tilt plate. Each part has a thickness and a thread, and together they must place the sensor at the exact distance the corrector was designed for, often within half a millimetre, and perfectly square to the optical axis.

When stars are elongated in the corners, or sharp on one side and soft on the other, the imaging train is usually the cause. This collection gathers the parts that solve it, from Baader, PrimaLuceLab, William Optics, ZWO, Player One, SVBONY, Wanderer Astro, Pegasus Astro, QHYCCD, Tele Vue and many more.

Filters

Original price CA$206.00 - Original price CA$206.00
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APM 50mm Image Master Guide Scope

APM Image Master Mini Guiding Scope 50 mm - Deluxe Finder ScopeThe compact lightweight mini Telescope - perfect for guiding, searching or spottingT...

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Original price CA$206.00 - Original price CA$206.00
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Original price CA$150.00 - Original price CA$150.00
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Askar 32mm F4 Guide Scope

32mm Aperture 128mm Focal Length (f/4) Contains One ED Glass Element Precision Helical Focuser Weighs only 303g Description FAQ Specifications ...

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Original price CA$150.00 - Original price CA$150.00
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Original price CA$276.00 - Original price CA$276.00
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Askar 52mm F4 Guide Scope

Aperture: 52mm Focal Length: 208mm Focal Ratio: f/4 Focuser: Helical with 25mm travel Weight: 631g Description FAQ Specifications In the Box Do...

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Original price CA$276.00 - Original price CA$276.00
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Original price CA$399.00 - Original price CA$399.00
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Askar 52mm Super ED Guide Scope

52mm Aperture 249.6mm Focal Length (f/4.8) Air-Spaced Doublet Objective Lightweight 0.74kg Design Includes M42x0.75 and 1.25" Adapters Descript...

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Original price CA$399.00 - Original price CA$399.00
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Original price CA$260.00 - Original price CA$260.00
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Askar Focal Plane Adjuster

Corrects focal plane tilt without altering back focus Maintains a constant 18mm optical thickness Provides a ±1° adjustment range Features M54 fem...

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Original price CA$260.00 - Original price CA$260.00
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Original price CA$23.00 - Original price CA$23.00
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CA$23.00
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Askar M42-M48 Photo Adapter for FMA180

Connects M48 (2-inch) accessories to the Askar FMA180 Converts the native M42x0.75 T-thread to a larger M48x0.75 thread Made by Askar for the FMA1...

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Original price CA$23.00 - Original price CA$23.00
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Original price CA$276.00 - Original price CA$276.00
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Askar M54 Off-Axis Guider (OAG)

Large 10mm x 10mm guide prism M54, M48, and M42 adapters provide broad compatibility Optimized for full-frame cameras Rigid CNC-machined construct...

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Original price CA$276.00 - Original price CA$276.00
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Original price CA$199.00 - Original price CA$199.00
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Askar M54/M48 Backfocus Adjuster

Provides ±2mm of fine backfocus adjustment Total optical length adjustable from 16mm to 20mm High-precision 0.05mm increments Available with M54 o...

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Original price CA$199.00 - Original price CA$199.00
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Original price CA$60.00 - Original price CA$60.00
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Askar M54/M48 T-Ring for Canon EOS-R

Connects Canon RF (EOS R) mirrorless cameras to your telescope Female M54 and M48 threads on the telescope side 35 mm length reaches the sta...

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Original price CA$60.00 - Original price CA$60.00
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Askar M54/M48 T-Ring for Nikon Z

Connects Nikon Z mirrorless cameras to your telescope Female M54 and M48 threads on the telescope side 39 mm length reaches the standard 55 ...

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Askar M54/M48 T-Ring for Sony E-Mount

Connects Sony E (NEX) mirrorless cameras to your telescope Female M54 and M48 threads on the telescope side 37 mm length reaches the standar...

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Original price CA$60.00 - Original price CA$60.00
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Original price CA$117.00 - Original price CA$117.00
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Baader Complete T-2 Changer System

Enables rapid swapping of T-2 threaded accessories Maintains precise rotational alignment between changes Secure locking mechanism prevents tilt a...

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Original price CA$117.00 - Original price CA$117.00
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Original price CA$46.00 - Original price CA$46.00
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Baader Ultrashort Clamp - 1.25"/T-2

Connects 1.25" accessories to T-2 threads Ultrashort design minimizes optical path length Ideal for complex imaging trains with limited back focus...

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Original price CA$57.00 - Original price CA$57.00
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Baader 1" C-Mount Adapter w/ 1.25" Nosepiece - 18mm Long

Connects C-Mount (1") cameras to 1.25" focusers Has an 18mm insertion length and adds 4mm of optical length Internal threads accept standard 1.25"...

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Original price CA$57.00 - Original price CA$57.00
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Original price CA$66.00 - Original price CA$66.00
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Baader 2" Nosepiece to T-2/M48a – with Safety-Kerf

Connects T-2 and M48 accessories to a standard 2-inch focuser Features a modern, shallow T-2 thread depth for new cameras Dual male threads: T-2 (...

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Original price CA$66.00 - Original price CA$66.00
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Original price CA$44.00 - Original price CA$44.00
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Baader 2"/2" Inverter Ring

2-inch Female Thread (Both Sides) Couples Accessories with Male 2-inch Threads Solves Incompatible Gender Connections Ensures a Rigid, Threaded Li...

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Original price CA$44.00 - Original price CA$44.00
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Original price CA$46.00 - Original price CA$46.00
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Baader 2"/2" Inverter Ring w/ 48mm Filter Thread

Creates a direct 2" male thread connection on Baader diagonals Replaces the standard 2" ClickLock eyepiece clamp Solves critical backfocus/in-trav...

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Original price CA$46.00 - Original price CA$46.00
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Original price CA$67.00 - Original price CA$67.00
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Baader Adapter - 1.25"/2"" w/ T-2 Thread

Reduces a 2" focuser to accept 1.25" accessories Features an external male T-2 thread for direct camera attachment Strong grip with 2 screws and a...

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Original price CA$67.00 - Original price CA$67.00
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CA$67.00
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Original price CA$60.00 - Original price CA$60.00
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Baader Adapter - 2" SCT(M) Thread/T-2(M)

Connects 2" SCT Male Threads to T-2 (M42x0.75) Male Threads Features Internal Threads for Standard 2" Mounted Filters Integrates Filtration Direct...

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Original price CA$60.00 - Original price CA$60.00
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Original price CA$271.00 - Original price CA$271.00
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Baader Adapter - FLI Dovetail/M68x1(M)

Connects FLI Dovetail Mounts to M68x1 Threads Provides a Male (External) M68x1 Thread Enables Integration with Baader M68 Accessories Precision-Ma...

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Original price CA$271.00 - Original price CA$271.00
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Original price CA$33.00 - Original price CA$33.00
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Baader Adapter - M36.4(M)/T-2(M)

Connects Vixen M36.4 Female Threads to T-2 Female Threads Side 1: Male M36.4 x 1.0 Thread (Vixen Standard) Side 2: Male T-2 (M42 x 0.75) Thread En...

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Original price CA$33.00 - Original price CA$33.00
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Original price CA$37.00 - Original price CA$37.00
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Baader Adapter - M48/T-2

Adapts M48 (female) threads to T-2 (male) threads Lets T-Rings with an M48 female thread take accessories with a male T-2 thread Part of the Baade...

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Original price CA$37.00 - Original price CA$37.00
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Original price CA$70.00 - Original price CA$70.00
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CA$70.00
CA$70.00 - CA$70.00
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Baader Adapter - M68x1(F)/AP 2.7"(M)

Connects Baader M68x1 Female Threads to AP 2.7" Male Threads Creates a Rigid, Non-Flexing Connection for Imaging Precision-Machined for Secure Opt...

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Original price CA$70.00 - Original price CA$70.00
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Original price CA$83.00 - Original price CA$83.00
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CA$83.00
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Current price CA$83.00

Baader Adapter - M68x1(F)/M63x1(M) (Feather Touch 2.5", TS-Optics)

Connects M68 accessories to M63 focusers Female Thread: M68x1 Male Thread: M63x1 Designed for 2.5" Feather Touch and select TS-Optics focusers Cre...

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Original price CA$83.00 - Original price CA$83.00
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Parts of the Imaging Train

  • Thread adapters and spacers: Convert between M42, M48, M54, M68 and SCT threads and set the distance. See T-rings, spacers and thread adapters.
  • Off-axis guiders: Pick off a guide star in front of the sensor, eliminating flexure between guide scope and main telescope. See off-axis guiders and guide scopes.
  • Rotators: Turn the camera to frame the target without loosening anything. Motorized rotators make framing repeatable across nights.
  • Tilt adjusters: Push-pull plates that square the sensor to the light path. See rotators and tilt adjusters.

Back-Focus in Practice

  • Start with the number: Most flatteners need 55 mm from their thread to the sensor. Some need 56.2, 63 or something else entirely. Check your corrector.
  • Count everything: Camera internal distance, filter wheel or drawer, OAG, adapters and spacers.
  • Add for filters: A filter adds about one third of its thickness. A 2 mm filter needs about 0.7 mm more spacing.
  • Prefer threads to compression: Threaded connections hold squareness much better than 2-inch nosepieces with thumb screws.

We Plan Your Train for You

  • Spacing sheet: Send us your corrector, camera and accessories. We return the list of parts and the exact distances.
  • Diagnosis: Send a raw frame and we will tell you whether the spacing is too long, too short or tilted.

Imaging Train: Frequently Asked Questions

How do I know if my back-focus is wrong?

Stars stretched radially in all corners point to spacing too short or too long. Stars that are good on one side only point to tilt.

Can I use a 2-inch nosepiece for imaging?

It works, but threaded connections are stiffer and more square. For larger sensors, go threaded.

Need a back-focus plan?

Send us your telescope, corrector and camera. We will list every part and distance.