What item is right for you?
Ask our Experts! 800.606.6969 Live Chat

Celestron Deluxe Tele-Extender

B&H # CETED Mfr # 93643
In Stock
Free Expedited Shipping
You Pay: $54.52
Product Highlights
  • For Eyepiece Projection Imaging
  • For 5-14" Celestron Cassegrains
  • For 7" & Larger Meade Cassegrains
  • Requires Celestron Visual Back
  • Requires an Eyepiece
  • Requires a Camera-Specific T-Mount

The Celestron Deluxe Tele-Extender for Schmidt-Cassegrain telescopes is a hollow tube that attaches to a telescope with an eyepiece installed, allowing photography of very small objects such as the moon and planets.  By using the Deluxe Tele-Extender in combination with an eyepiece, you can increase your instrument's effective focal length to well over 10,000mm!  And this corresponds with a matching increase in image size.  This technique is known as eyepiece projection photography.  The following formula can be used to determine approximate effective focal length:
Effective focal length = Telescope focal length/Eyepiece focal length x DF(the distance from the center of the eyepiece to the film)

The Deluxe Tele-Extender is used for high-power lunar, solar and planetary photography as well as for extreme terrestrial photography.  It fits over a 1.25" eyepiece up to 41mm thick and connects to the visual back of the telescope.  Optional counterweights will be necessary to properly balance the telescope when using the Tele-Extender. Please note that Celestron's visual back, #93653-A, is required in all cases.

To use the Deluxe Tele-Extender, remove the diagonal from your telescope and insert an eyepiece directly into the visual back.  Place the Tele-Extender over both the eyepiece and the visual back, then attach your 35mm SLR camera to the back of the Tele-Extender using your camera system's specific T-mount.  The Tele-Extender's built-in safety device will help prevent your eyepiece from becoming accidentally dislodged.

There are a few things to bear in mind when using a Tele-Extender.  First, the image seen through your camera's viewfinder will be upside down.  Second, due to the extremely high magnifying effect afforded by this accessory, extra care to prevent camera and telescope vibration, accurate polar alignment and use under good seeing conditions will all assist you in capturing high quality images.

Accepts 1.25" eyepieces of up to 41mm diameter
Celestron's visual back is required (supplied standard with Celestron scopes, and a required option when using upon Meade telescopes)
Celestron Deluxe Tele-Extender
  • 1-Year Warranty
  • REVIEW SNAPSHOT®

    by PowerReviews
    CelestronDeluxe Tele-Extender
     
    3.7

    (based on 12 reviews)

    Ratings Distribution

    • 5 Stars

       

      (4)

    • 4 Stars

       

      (4)

    • 3 Stars

       

      (2)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (2)

    82%

    of respondents would recommend this to a friend.

    Pros

    • Strong construction (10)
    • Easy to use (9)

    Cons

      Best Uses

      • Astrophotography (9)
      • Astronomy (4)
      • Terrestrial viewing (3)
        • Reviewer Profile:
        • Casual/ recreational (8), Avid adventurer (4)
        • Was this a gift?:
        • No (9)

      Most Liked Positive Review

       

      Easy to setup and use

      I thought this would be hard, but it wasn't. I had some very big Celestron X-cel eyepieces and I was able to use them all with this. And the results were very good....Read complete review

      I thought this would be hard, but it wasn't. I had some very big Celestron X-cel eyepieces and I was able to use them all with this. And the results were very good. I did not need to add any counterbalance after using my largest eyepiece, a Canon 500D on a C8-SLT AS mount. It all worked well and only took a few minutes to connect together and start shooting.The 18mm eyepiece gave me a FL of about 15000 and the 10mm eyepiece a staggering 28000.

      VS

      Most Liked Negative Review

       

      Solid, slot is puzzling

      Solid aluminum, holds the camera rigidly on a Celestron 8SE.

      Only one slot cut in it for the visual back's eyepiece screw(s). Why?

      (Removable) housing over...Read complete review

      Solid aluminum, holds the camera rigidly on a Celestron 8SE.

      Only one slot cut in it for the visual back's eyepiece screw(s). Why?

      (Removable) housing over the slot doesn't fit over the visual back's eyepiece screw. Why?

      I've removed the housing over the slot. I'm going to have to cut another eyepiece screw slot, I guess. Otherwise I'm going to have to remove (and possibly lose) one of the eyepiece screws every time I use this. Don't like the feeling of only having one screw holding the eyepiece in anyway.

      It does the job just fine once you get it on and find focus. My 32mm eyepiece fully covered the full-frame sensor of a Nikon D700 and gave about 2x magnification over the camera at prime focus. Of course, at a significant cost in illumination...

      Reviewed by 12 customers

      Sort by

      Displaying reviews 1-12

      Back to top

       
      1.0

      Slightly Misleading

      By Stargazer

      from Henderson, NV

      About Me Avid Adventurer

      Verified Buyer

      Pros

        Cons

        • Poor Fit

        Best Uses

          Comments about Celestron Deluxe Tele-Extender:

          Although a well made product, it does not work properly on a Celestron EdgeHD telescope. The visual back on the Edge is tapered, and the set screws that hold this tele-extender on the visual back will not hold properly unless the eyepiece is taped in place, and the set screws that hold the eyepiece in are completely removed.

          • Was this a gift?:
          • No

          Share this review

           
          4.0

          exactamundo

          By bubba

          from shreveport,la

          About Me Casual/ Recreational

          Verified Buyer

          Pros

          • Easy To Use

          Cons

            Best Uses

            • Astrophotography

            Comments about Celestron Deluxe Tele-Extender:

            this product was exactly what i needed to bring the planets closer and get some nice shots of them. easy to use and adaptable for all my lenses. a little elect. tape and ingenuity and away i went.

            • Was this a gift?:
            • No

            Share this review

             
            4.0

            tele-extender

            By bubba

            from shreveport,la

            About Me Casual/ Recreational

            Verified Buyer

            Pros

            • Easy To Use
            • Strong Construction

            Cons

              Best Uses

              • Astrophotography
              • Terrestrial Viewing

              Comments about Celestron Deluxe Tele-Extender:

              recieved this in a very timely manner. i use this for projection photography. it houses all my oculars well. even if i make-up a set (ie:a 1 1/4 barlow and a 40 or 32 mm taped together) it fits my focuser and camera well. no complaints

              • Was this a gift?:
              • No

              Share this review

               
              3.0

              Solid, slot is puzzling

              By Pedxing

              from Garmisch-Partenkirchen

              About Me Casual/ Recreational

              Verified Buyer

              Pros

              • Easy To Use
              • Strong Construction

              Cons

              • Poor design

              Best Uses

              • Lunar Photography

              Comments about Celestron Deluxe Tele-Extender:

              Solid aluminum, holds the camera rigidly on a Celestron 8SE.

              Only one slot cut in it for the visual back's eyepiece screw(s). Why?

              (Removable) housing over the slot doesn't fit over the visual back's eyepiece screw. Why?

              I've removed the housing over the slot. I'm going to have to cut another eyepiece screw slot, I guess. Otherwise I'm going to have to remove (and possibly lose) one of the eyepiece screws every time I use this. Don't like the feeling of only having one screw holding the eyepiece in anyway.

              It does the job just fine once you get it on and find focus. My 32mm eyepiece fully covered the full-frame sensor of a Nikon D700 and gave about 2x magnification over the camera at prime focus. Of course, at a significant cost in illumination...

              • Was this a gift?:
              • No

              Share this review

               
              1.0

              Deluxe Tele-Extender by Celestron

              By David

              from Woodlawn, TN

              About Me Casual/ Recreational

              Pros

              • Strong Construction

              Cons

              • Poor Construction

              Best Uses

                Comments about Celestron Deluxe Tele-Extender:

                I was excited to use this after it arrived to try it out. It is sloppy and will not hold the camera directly over the eyepiece. I'm disappointed that Celeron couldn't design a better product. For what I paid for this, I would think it would at least hold the Eyepiece centered

                • Was this a gift?:
                • No

                Share this review

                 
                4.0

                Expensive But Nice

                By The Fantastic G

                from Tomball, TX

                About Me Casual/ Recreational

                Verified Buyer

                Pros

                • Easy To Use
                • Strong Construction

                Cons

                  Best Uses

                  • Astronomy
                  • Astrophotography

                  Comments about Celestron Deluxe Tele-Extender:

                  It's expensive for what it is, but it's of better construction than the other 3rd party tele extender I purchased.

                  • Was this a gift?:
                  • No

                  Share this review

                   
                  5.0

                  I'd buy it again

                  By ZERO311

                  from Tucson, AZ

                  About Me Avid Adventurer

                  Verified Buyer

                  Pros

                  • Easy To Use
                  • Strong Construction
                  • Widely Compatible Adapter

                  Cons

                    Best Uses

                    • Astrophotography

                    Comments about Celestron Deluxe Tele-Extender:

                    Taking photos of the moon and planets

                    • Was this a gift?:
                    • No

                    Share this review

                     
                    3.0

                    Serves a purpose but not perfect

                    By PeterA

                    from Brisbane Australia

                    About Me Casual/ Recreational

                    Verified Buyer

                    Pros

                    • Strong Construction

                    Cons

                    • Poor Fit

                    Best Uses

                    • Astrophotography

                    Comments about Celestron Deluxe Tele-Extender:

                    The unit fits over the visual back. The projection eyepiece is placed in the visual back and secured with the standard retaining screw. The unit needs the appropriate T ring adaptor to attach to your camera.
                    Positives
                    Well constructed and solid
                    Will work perfectly

                    Negatives
                    Expensive for a simple projection fitting.
                    The standard eyepiece retaining screw will not slide into the little metal box made for it. I had to use an Allen key to undo the box and swing it around 180 degrees out of the way. Then no problem.

                    The second retaining screw has to be removed from the visual back before use. Surely they could have arranged a slot for this to slide into also.

                    • Was this a gift?:
                    • No

                    Share this review

                     
                    5.0

                    I'm very happy

                    By professor

                    from Venice, Florida

                    About Me Avid Adventurer

                    Verified Buyer

                    Pros

                    • Easy To Use
                    • Great Optics
                    • Strong Construction

                    Cons

                      Best Uses

                      • Astronomy
                      • Astrophotography

                      Comments about Celestron Deluxe Tele-Extender:

                      I use this on my Celestron CPC 8 and it works great.

                      • Was this a gift?:
                      • No

                      Share this review

                       
                      5.0

                      Celestron

                      By Leave

                      from Canton MI

                      About Me Avid Adventurer

                      Verified Buyer

                      Pros

                      • Easy To Use
                      • Strong Construction

                      Cons

                        Best Uses

                        • Astrophotography

                        Comments about Celestron Deluxe Tele-Extender:

                        I like it. It has a feeling of it being made to last.

                        Share this review

                         
                        5.0

                        Easy to use and great results

                        By Bob

                        from Dubai

                        About Me Casual/ Recreational

                        Verified Reviewer

                        Pros

                        • Easy To Use
                        • Strong Construction

                        Cons

                        • Bulky
                        • Heavy

                        Best Uses

                        • Astronomy
                        • Astrophotography
                        • Terrestrial Viewing

                        Comments about Celestron Deluxe Tele-Extender:

                        Was easy to setup and I used it with my very large Celestron X-Cel eyepieces which I thought would not fit. I did not have to use any additional counterweights with my C8-SGT AS mount, fitted with my largest eyepiece and a canon EOS 500D. The results were better than I expected. With the 18mm eyepiece, the FL was around 14000 and with the 10mm eyepiece, a staggering 28000.

                        Share this review

                         
                        4.0

                        Easy to setup and use

                        By Bob

                        from Dubai

                        About Me Casual/ Recreational

                        Pros

                        • Easy To Use
                        • Strong Construction
                        • Widely Compatible Adapter

                        Cons

                        • Long

                        Best Uses

                        • Astronomy
                        • Astrophotography
                        • Terrestrial Viewing

                        Comments about Celestron Deluxe Tele-Extender:

                        I thought this would be hard, but it wasn't. I had some very big Celestron X-cel eyepieces and I was able to use them all with this. And the results were very good. I did not need to add any counterbalance after using my largest eyepiece, a Canon 500D on a C8-SLT AS mount. It all worked well and only took a few minutes to connect together and start shooting.The 18mm eyepiece gave me a FL of about 15000 and the 10mm eyepiece a staggering 28000.

                        Share this review

                        T-Mounts

                        Show more >

                        Required item: A T-Mount adapter is required to use this product.

                        Celestron -  T-Mount SLR Camera Adapter for Canon EOS
                        • You Pay: $8.95
                         
                        Vello -  Lens Mount Adapter - T Mount Lens to Canon EOS Camera
                        • You Pay: $8.75
                         

                        Eyepieces, Lenses & Diagonals

                        Celestron -  X-Cel LX 25mm Eyepiece (1.25")
                        • You Pay: $59.95
                         
                        Celestron -  X-Cel LX 18mm Eyepiece (1.25")
                        • You Pay: $59.95
                         

                        System Extensions

                        Celestron -  Vibration Suppression Pads (useful at high power when near cars, etc.)
                        • You Pay: $39.39
                         

                        Filter Thread Adapters

                        Celestron -  Visual Back (1.25")
                        • You Pay: $24.99
                         

                        Books & Tutorials

                        Amherst Media -  Book: Heavenly Bodies: The Photographer's Guide to Astrophotography
                        • You Pay: $23.39
                         
                        Amherst Media -  Book: Backyard Astronomer's Guide
                        • You Pay: $44.95
                        Usually ships in 7-14 business days i This is a special order item and is non-cancelable and non-returnable. Est. arrival at B&H is 7-14 business days (subject to availability). Your order will be charged at time of shipment.
                         
                        See any errors on this page? Let us know.

                        Close

                        Close

                        Close