Canon EOS-R 2" UltraWide Prime Focus Telescope Adapter - Full Length

2" Prime Focus Adapter Set for Canon EOS-R Mirrorless
Fits EOS R50, R10, R8, R7, R6, R5, R3, Ra, Rp, RF

Full Length Version

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As seen in Sky & Telescope Magazine.

2" UltraWide EOS "R" Full Length Adapter

This Full Length adapter is best for Refractor type telescopes. The large UltraWide aperture will have zero adapter induced vignetting of the large sensors used in the EOS-R series. The standard "T2" long length is more appropriate for Refractors. An additional 40mm of Extension Tube (our #EXT240) will give the proper back focus for most 2" Refractors to focus at infinity. The included Clear Glass Dust Filter helps keep dust off your sensor. This is especially important with Refractor type scopes since they "pump air" when the focuser is racked in and out.

While this can be used on SCTs the Low Profile version (#T2EOSR-LP) will give more physical clearance and make for a shorter setup with more available back focus.

For Reflectors/Newtonians/Dobs please see our Low Profile version (T2EOSR-LP) as this version is too long to reach focus on these scopes.

View Enlarged Setup Diagram

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Q: I have a Meade (or Celestron) SCT telescope and would like to have the benefits of this adapter but my scope only accepts 1.25" eyepieces. Is there any way I can use this adapter?
A: If your SCT is not already setup to accept 2" eyepieces and accessories you will need a 2" Rear Port Adapter, this item threads onto the large thread on the rear cell of your scope and converts it to a standard 2" eyepiece port. The T-Minus adapter will slide directly into this port.

Q: I have a Meade (or Celestron) SCT telescope. Will this adapter thread directly on to the rear cell of my scope?
A: This adapter will not thread directly onto the rear of an SCT scope, It has a 2" barrel just like a 2" eyepiece and inserts into a 2" eyepiece port. If your SCT is not setup to accept 2" eyepieces you will need a 2" Rear Port Adapter. This is actually better than if it threaded on to the scope directly as it allows you to very quickly and easily install and remove the camera during a session. It also gives you absolute freedom in positioning the camera radially for the best framing of your shot.

Q: Will this adapter work on my Refractor type telescope with 2" Focuser?
A: Yes, but note that most all refractor type telescopes require you to remove the diagonal and replace it with a slightly shorter extension tube to reach focus with a camera. Extension Tube #EXT240 is appropriate for replacing most 2" Diagonals.

Q: Will this adapter work on my Reflector/Newtonian/Dob type telescope with 2" Focuser?
A: For Reflectors/Newtonians/Dobs please see our Low Profile version (T2EOSR-LP) as this version is too long to reach focus on these scopes.

Q: Will this adapter fit my spotting scope (or microscope)?
A: This adapter is for astronomical type telescopes equipped with 2" eyepiece ports ONLY. It will not fit spotting scopes or microscopes. If you need help selecting the proper adapter just send us an email. Please include camera and scope models.

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For Canon EOS-R Cameras.