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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)
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    Product Description

    **Please allow 1-2 weeks for assembly and testing of each individual unit. 
     

    sffx2-backfocus-layout-with-adapter-copy.jpg

    Made here and available exclusively from Stellarvue, this dedicated field flattener will work with virtually every astro-imaging camera when the proper extensions and adapters needed for your camera are added. It provides an enormous flat field up to 90 mm in diameter for the 180. We designed this to work with our 130 mm - 180 mm refractors. 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 sell 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 you purchase an SFFX2 field flattener for a particular telescope we ask you what the thread size is on your camera. We then provide you with a field flattener that has the proper length extension tube for the telescope and a camera adapter that is the same as on your camera. We assume that your camera train is standardized so there is 55 mm between the camera's sensor and the camera's attachment thread. This is the case with most astronomy imaging cameras such as ZWO (when you attach the provided extensions) and it is also the same when using a DSLR camera with standard t-ring or a mirrorless camera with the long t-ring. 
     
    Some imaging cameras do not adhere to the standard 55 mm spacing. This spacing, is also called "backfocus" but do not let this confuse you. Backfocus has nothing to do with image focus. It has to do with a measurement. So, check with your camera manufacturer and confirm that the camera and all its attachments (such as off-axis guider, filter wheel, tilt adjuster, etc.) adds up to 55 mm. 
     
    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.

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