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  • SFFX-2 with adapters for 55 mm back focus

    • SFFX2

    $695.00
    (2 reviews) Write a Review
    SKU:
    SFFX-2
    Width:
    8.00 (in)
    Height:
    8.00 (in)
    Depth:
    8.00 (in)

    Product Description

    The SFFX-2 field flattener is no longer available. It has been replaced with the new SFFX-3. The SFFX-3 should not be confused with the SFF3 which was an old imported flattener we sold years ago. The new SFFX-3 is our latest, improved design. It will fit more cameras, does not vary in back focus as the SFFX-2 did, and has a much longer back-focus (permitting the use of additional accessories such as a rotator).  

    sffx2-backfocus-layout-with-adapter-copy.jpgThis photographic field flattener was designed to work with our 130 mm - 180 mm refractors and it requires the proper extensions and adapters needed for your telescope and camera combination. The optimum distance from the back of the flattener to the camera's sensor varies depending on the telescope used. 

    Mounting your camera to the field flattener: We sold these flatteners optimized for our various telescopes by providing different extension tubes. For best results, the field flattener must be placed at a precise distance from the camera sensor. Since many customers have camera trains of different lengths, we manufacture and offer various extension tubes and spacer rings to accommodate a wide variety of camera set ups. These M69 extensions are found here.
     
    When we sold SFFX2 field flatteners for a particular telescope we supplied them with a camera adapter to match the thread size of the customer's camera. We supplied these thread size adapters:
    • M42
    • M48
    • M54
    • M68
    • 2.156
    • 3"-24
    We also provided the proper length extension tube for the customers particular telescope and a camera combination. If not specified, we assumed the camera had the standard 55 mm back focus. This is the case with most astronomy imaging cameras such as ZWO (when you attach their provided extensions) and it is also the same when using a DSLR camera with standard t-ring or a mirrorless camera with the longer t-ring. 
     
    Some imaging cameras do not adhere to the standard 55 mm spacing. In this case, the SFFX-2 could be provided with different length extensions to adjust for this to a limited extent.
     
    If the distance to your camera's sensor is not 55 mm refer to the picture below. This picture shows the SFFX2 with the M69 extension tube and camera thread adapter removed. As you can see, the optimal distance to the camera's sensor without these parts varies when you use the flattener with different Stellarvue telescopes. Use the picture below to determine which extension tube(s) you need with your particular camera backfocus. Again, the extensions and spacer rings may be found here.
    layout-sffx2-with-feather-touch.jpg 
     
    Mounting your field flattener to the focuser: The front of the flattener threads directly to the Feather Touch 3.5" focuser when the 2" adapter and the M75 - M88.5 adapter it screws into is removed (unthreaded) from the focuser. When using the SFFX-2 with the 3.5" Moonlite focuser, use the threaded Moonlite to SFFX2 adapter.  
     
    Feel free to call us at (530) 823-7796 or email us at mail@stellarvue.com if you have any questions.

    Weight with adapters is 2lb 1oz.

     
     

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    • 5
      SFFX2 Flattener

      Posted by Paul O’Brien on 13th Feb 2023

      Two nights ago, the first clear skies in weeks gave me an opportunity for first light with my TEC140ED and new SFFX2 flattener from Stellarvue. The flattener is HUGE and weighs 2 lbs. It's a thing of beautiful - well engineering and designed, simple and clean. The front of the flattener threads directly to the Feathertouch 3.5" focuser. SV provides different adapters and extensions to fit various camera threads and imaging train requirements. SV made a custom adapter for my QHY600M rig and provided two additional 1mm spacers and a 10mm extension for my specific back focus needs. The back focus is spec’d for 79-80mm, depending on the scope size and FL. I ended up with about 81mm for the TEC140 and still need a tad more spacing so I'll probably end up adding another .6 -.8mm spacer. So far, I'm very impressed and it looks like a great match for the TEC. BTW - Vic at Stellarvue was a pleasure to work with on the flattener. Paul: Thank you! Vic Maris

    • 5
      SFFX-2

      Posted by Jerry yesavage on 6th Dec 2021

      Makes images from my SVX 130T flat as a board. Checked with CCDInspector.