Skip to content
Price match 30-day returns* Talk to an astronomer before you buy

End Caps and Flanges

End caps and flanges are the least glamorous parts in a telescope and among the most consequential. A flange determines whether a third-party focuser will bolt to your tube at all, and a proper end cap is what keeps dust, moisture and insects out of an optical path that is difficult to clean. David Astro carries end caps and flanges in Canada, covering drawtube terminations, telescope-specific mounting plates and dust protection, held in our Canadian warehouse.

Fit here is exact rather than approximate. Send us your telescope model and focuser and we will identify the correct flange rather than leaving you to measure a bolt circle.

Filters

$180.00 USD - $180.00 USD
$180.00 USD
$180.00 USD - $180.00 USD
$180.00 USD

Starlight Instruments 2.0" Adapter for Astro-Physics Stowaway

Enables mounting a 2.0" Feather Touch Focuser Designed specifically for pre-2018 Astro-Physics Stowaway models Precision-machined for a secure, th...

View full details
$180.00 USD - $180.00 USD
$180.00 USD
$180.00 USD - $180.00 USD
$180.00 USD
$160.00 USD - $160.00 USD
$160.00 USD
$160.00 USD - $160.00 USD
$160.00 USD

Starlight Instruments 2.0" Adapter for Astro-Tech 10, 12, and 16" RC and GSO 10/12/16" Telescopes

Enables mounting of a 2.0" Feather Touch Focuser Designed for Astro-Tech 10", 12", and 16" RC Telescopes Designed for GSO 10", 12", and 16" RC Tel...

View full details
$160.00 USD - $160.00 USD
$160.00 USD
$160.00 USD - $160.00 USD
$160.00 USD
$130.00 USD - $130.00 USD
$130.00 USD
$130.00 USD - $130.00 USD
$130.00 USD

Starlight Instruments 2.0" Adapter for Astro-Tech 6", 8" and GSO 6", 8" RC Telescope, WO Newer Megrez 80/90mm and WO GT81 Telescope

Connects a 2.0" Starlight Instruments Feather Touch Focuser to your telescope Designed for Astro-Tech and GSO 6" and 8" Ritchey-Chrétien telescope...

View full details
$130.00 USD - $130.00 USD
$130.00 USD
$130.00 USD - $130.00 USD
$130.00 USD
$130.00 USD - $130.00 USD
$130.00 USD
$130.00 USD - $130.00 USD
$130.00 USD

Starlight Instruments 2.0" Adapter for Astro-Tech 65mm Telescopes

Connects Starlight Instruments 2.0" focusers to Astro-Tech 65mm telescopes Ensures a rigid, direct-thread mounting for astrophotography Machined s...

View full details
$130.00 USD - $130.00 USD
$130.00 USD
$130.00 USD - $130.00 USD
$130.00 USD
$190.00 USD - $190.00 USD
$190.00 USD
$190.00 USD - $190.00 USD
$190.00 USD

Starlight Instruments 2.0" Adapter for Astro-Tech 72mm and William Optics 72mm Telescopes

Enables mounting a 2.0" Starlight Instruments focuser Designed for Astro-Tech 72mm refractors Designed for William Optics 72mm refractors Provides...

View full details
$190.00 USD - $190.00 USD
$190.00 USD
$190.00 USD - $190.00 USD
$190.00 USD
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD

Starlight Instruments 2.0" Adapter for Borg M57

Connects Starlight Instruments 2.0" focusers to Borg telescopes Telescope-Side Thread: Borg M57 Focuser-Side Thread: 69mm x 0.75mm Description ...

View full details
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD
$180.00 USD - $180.00 USD
$180.00 USD
$180.00 USD - $180.00 USD
$180.00 USD

Starlight Instruments 2.0" Adapter for Brandon Telescopes

Adapts Brandon Telescopes for 2.0" Accessories Telescope-Side Thread: 71x1mm Use with Feather Touch Focuser FTF2025BCR Precision-Machined by Starl...

View full details
$180.00 USD - $180.00 USD
$180.00 USD
$180.00 USD - $180.00 USD
$180.00 USD
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD

Starlight Instruments 2.0" Adapter for Celestron & Meade fork Mounted SCT Telescopes

Enables mounting of 2.0" Feather Touch focusers Known to fit Celestron C/CPC8, C/CPC9.25 and Meade 8" RCX400, LX90, LX200 Attaches to the standard...

View full details
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD

Starlight Instruments 2.0" Adapter for Celestron & Meade Small Thread SCT Telescopes

Connects Starlight Instruments FTF2015BCR focusers to select SCTs Fits Celestron 8", CPC 800, 9.25", and CPC 9.25 models Also fits the Meade 8" SC...

View full details
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD

Starlight Instruments 2.0" Adapter for Celestron C11 /C14 SCT Telescopes

Adapts 2.0" Feather Touch focusers to large-format Celestron SCTs Threads onto the 3.29"-16TPI rear cell of C11 and C14 OTAs Provides a rigid, no...

View full details
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD

Starlight Instruments 2.0" Adapter for Celestron C11/ C14 SCT Telescopes

Connects 2.0" Feather Touch Focusers to Select Celestron SCTs Threads onto the 3.29-16 Large Visual Back Compatible with C11, C14, CPC1100, and C1...

View full details
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD
$150.00 USD - $150.00 USD
$150.00 USD
$150.00 USD - $150.00 USD
$150.00 USD

Starlight Instruments 2.0" Adapter for Celestron C70 Telescope

Adapts Celestron C70 refractors to accept 2.0" focusers Enables use of Starlight Instruments Feather Touch focusers Allows for 2.0" diagonals and ...

View full details
$150.00 USD - $150.00 USD
$150.00 USD
$150.00 USD - $150.00 USD
$150.00 USD
$160.00 USD - $160.00 USD
$160.00 USD
$160.00 USD - $160.00 USD
$160.00 USD

Starlight Instruments 2.0" Adapter for Celestron, 102mm Telescope

Adapts Celestron 102mm Telescopes Accepts Starlight Instruments 2.0" Feather Touch Focusers Enables Precision Focusing for Astrophotography Machin...

View full details
$160.00 USD - $160.00 USD
$160.00 USD
$160.00 USD - $160.00 USD
$160.00 USD
$200.00 USD - $200.00 USD
$200.00 USD
$200.00 USD - $200.00 USD
$200.00 USD

Starlight Instruments 2.0" Adapter for ES Comet Hunter

Enables mounting a 2.0" Feather Touch focuser Designed for the Explore Scientific Comet Hunter Use with the FTF2025BCR 2.0" Feather Touch focuser ...

View full details
$200.00 USD - $200.00 USD
$200.00 USD
$200.00 USD - $200.00 USD
$200.00 USD
$160.00 USD - $160.00 USD
$160.00 USD
$160.00 USD - $160.00 USD
$160.00 USD

Starlight Instruments 2.0" Adapter for GSO Carbon Truss Newtonian

Enables Installation of 2.0" Feather Touch Focusers Custom-Designed for GSO Carbon Truss Newtonians Two-Piece Design Utilizes Stock Mounting Plate...

View full details
$160.00 USD - $160.00 USD
$160.00 USD
$160.00 USD - $160.00 USD
$160.00 USD
$120.00 USD - $120.00 USD
$120.00 USD
$120.00 USD - $120.00 USD
$120.00 USD

Starlight Instruments 2.0" Adapter for Lunt Telescopes

Enables mounting a 2.0" Feather Touch focuser on compatible Lunt telescopes Provides a secure, direct-fit mechanical connection Machined specifica...

View full details
$120.00 USD - $120.00 USD
$120.00 USD
$120.00 USD - $120.00 USD
$120.00 USD
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD

Starlight Instruments 2.0" Adapter for Meade 10, 12, 14" SCT Telescopes

Connects 2.0" Feather Touch focusers to large Meade SCTs Compatible with Meade 10", 12", and 14" Schmidt-Cassegrain models Threads directly to the...

View full details
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD
Starlight Instruments 2.0" Adapter for Meade 10, 12, 14" SCT Telescopes, for FTF2008BCR Focuser
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD

Starlight Instruments 2.0" Adapter for Meade 10, 12, 14" SCT Telescopes, for FTF2008BCR Focuser

Connects FTF2008BCR Focuser to Meade SCTs Compatible with 10", 12", and 14" Meade SCT Models Threads Directly to Large SCT Visual Back Threads Pro...

View full details
$100.00 USD - $100.00 USD
$100.00 USD
$100.00 USD - $100.00 USD
$100.00 USD
$180.00 USD - $180.00 USD
$180.00 USD
$180.00 USD - $180.00 USD
$180.00 USD

Starlight Instruments 2.0" Adapter for Meade 80mm Telescopes

Enables mounting a Starlight Instruments 2.0" Feather Touch focuser Custom-designed for Meade 80mm series telescopes Provides a rigid, secure conn...

View full details
$180.00 USD - $180.00 USD
$180.00 USD
$180.00 USD - $180.00 USD
$180.00 USD
$130.00 USD - $130.00 USD
$130.00 USD
$130.00 USD - $130.00 USD
$130.00 USD

Starlight Instruments 2.0" Adapter for Meade Lightbridge Dobsonian Truss Telescopes

Enables installation of a 2.0" Starlight Instruments Feather Touch Focuser Specifically designed for Meade Lightbridge Dobsonian Truss Telescopes ...

View full details
$130.00 USD - $130.00 USD
$130.00 USD
$130.00 USD - $130.00 USD
$130.00 USD
$130.00 USD - $130.00 USD
$130.00 USD
$130.00 USD - $130.00 USD
$130.00 USD

Starlight Instruments 2.0" Adapter for MK190 Maksutov-Newtonian, Intes Alter MN84 Mak Newton, & ES8" Astrograph w/CF OTA

Enables mounting a 2" Feather Touch focuser Compatible with Sky-Watcher MN190 Maksutov-Newtonian Compatible with Intes Alter MN84 Maksutov-Newtoni...

View full details
$130.00 USD - $130.00 USD
$130.00 USD
$130.00 USD - $130.00 USD
$130.00 USD
$180.00 USD - $180.00 USD
$180.00 USD
$180.00 USD - $180.00 USD
$180.00 USD

Starlight Instruments 2.0" Adapter for MK67/MK69 Telescope

Connects 2.0" Feather Touch Focusers to Intes-Micro Telescopes Specifically designed for Alter MK67 and MK69 models Precision-machined for a secur...

View full details
$180.00 USD - $180.00 USD
$180.00 USD
$180.00 USD - $180.00 USD
$180.00 USD
$160.00 USD - $160.00 USD
$160.00 USD
$160.00 USD - $160.00 USD
$160.00 USD

Starlight Instruments 2.0" Adapter for Older William Optics Megrez 90

Connects a 2.0" Feather Touch Focuser to an older William Optics Megrez 90 Precision-machined for a secure, perfectly aligned fit Enables a critic...

View full details
$160.00 USD - $160.00 USD
$160.00 USD
$160.00 USD - $160.00 USD
$160.00 USD
$120.00 USD - $120.00 USD
$120.00 USD
$120.00 USD - $120.00 USD
$120.00 USD

Starlight Instruments 2.0" Adapter for Orion Sky Quest, XT Intelliscope Telescopes

Enables use of 2.0" Feather Touch focusers on compatible telescopes Fits Orion Sky Quest, XT Classic, and XT Intelliscope models (8", 10", 12", 14...

View full details
$120.00 USD - $120.00 USD
$120.00 USD
$120.00 USD - $120.00 USD
$120.00 USD

Flanges, Terminations and Protective Caps

This collection covers three distinct jobs: mounting a focuser to a tube, terminating a drawtube in a usable thread, and sealing an opening when the equipment is not in use.

  • Telescope-specific mounting flanges: Machined plates matched to a particular tube's bolt pattern, which is what allows an aftermarket focuser to be fitted squarely.
  • Drawtube end terminations: Convert a focuser's native output to a standard thread such as M48 or M68, giving you a clean starting point for an imaging train.
  • SCT and rear-cell flanges: Adapt Schmidt-Cassegrain rear cells to threaded standards for focusers, reducers and cameras.
  • Threaded dust caps: Seal a threaded port when a camera or eyepiece is removed, keeping the interior of the drawtube clean between sessions.
  • Objective and aperture caps: Full-aperture covers, including sub-aperture stops used to reduce light for lunar viewing.
  • Blanking plates: Cover unused ports on filter wheels, focusers and rear cells to prevent stray light entering the train.

Why Choose David Astro for End Caps and Flanges

These parts either fit exactly or do not work at all, so the value is in correct identification rather than selection.

  • Model-specific identification: Tell us the telescope and focuser and we will name the flange, rather than asking you to match a bolt circle from a photograph.
  • Squareness is critical: We advise on flanges that hold a focuser perpendicular to the optical axis, because tilt introduced here shows up as one-sided star elongation you cannot process out.
  • Genuine manufacturer parts: Authorized dealer supply with full warranty and verified authenticity.
  • Replacement caps for older gear: We can often source a lost cap for a discontinued telescope through dealer channels.

End Caps and Flanges in Canada: Frequently Asked Questions

How do I identify the flange my telescope needs?

By telescope make and model rather than by measurement, since bolt circles that look similar are often a few millimetres apart. Send us the model and the focuser you intend to fit and we will specify it.

Does a flange affect image quality?

Indirectly but significantly. A flange that holds the focuser slightly off-square tilts the whole imaging train, producing elongated stars on one side of the field regardless of how well the optics perform.

Are dust caps really necessary?

Yes. Dust on an interior surface is far harder to clean than dust on an objective, and moisture that condenses inside a sealed tube takes a long time to clear. Capping every open port between sessions is cheap insurance.

Do you stock these in Canada?

Yes, anything marked in stock is held in our Canadian warehouse.

Need a specific flange?

Send us your telescope and focuser model and we will identify the exact part. Canadian stock, fast domestic shipping.