Stellarvue Large Format Flattener for 2.5" Focusers - Accepts Standard 42mm T-Rings

ITEM #
SV-SFF3-25-42
  • Sale
  • Regular price $329.00
  • Stellarvue Large Format Flattener for 2.5" Focusers - Accepts Standard 42mm T-Rings

    • Sale
    • Regular price $329.00
    • ITEM #
      SV-SFF3-25-42


    0

    Features

    Stellarvue Large Format Flattener for 2.5" Focusers - Accepts Standard 42mm T-Rings

    A Little Bit About Field FlattenersŸ???????????

    A relatively short focal ratio refractor (f/6-f/7) has a highly curved focal plane. This creates a problem when imaging, because the CCD chip is flat, not curved. Thus stars near the edge of the image appear elongated instead of round. A field flattener is a special lens that corrects this distortion. These Stellarvue modular field flatteners will work with virtually every camera on the market by employing various adapters, which are sold separately. Now you do not have to worry about getting different flatteners when you change cameras. Instead, you merely purchase the correct extension rings or adapters as needed. Threaded adapters are a much better choice than plug-in adapters which can sag. Threading all components of the optical train ensures consistently sharper images.

    Stellarvue Large Chip Flattener for 2.5" Focusers

    The SFF3-25 flattener is made for Stellarvue f/7 refractors. It threads to the rear of the Stellarvue or Feathertouch 2.5Ÿ??????????? focuser. This flattener uses a standard 42mm camera attachment thread. Using a T ring, a DSLR camera may be used with this field flattener. This provides a completely threaded mounting solution for larger chip cameras when using a 2.5Ÿ??????????? focuser. When using a CCD astro camera, you may find that you require extra extension rings or adapters. If you are not sure which adapter is right for your set-up, give one of our telescope experts a call at 800-483-6287, start a chat, or send us an email.

    Additional Information

    Accessory TypeFlattener
    ConditionNew
    Free ShippingYes
    ManufacturerStellarvue
    Sizeon
    Warranty2 Year Warranty

    Questions & Answers

    Ask a Question
    • What adapter / extension ring would I need to use this flattener with a SBIG STF-8300C on a Stellarvue 90mm Raptor? Thank you in advance for your help. Bob

      The SBIG STF-8300C has a back focus of ~17.5mm, and the back focus of the flattener is 55mm +/-2mm from the M42 thread base, so you would need an male-to-female T2 adapter that was approximately 37.5mm +/- 2mm for best performance. You may need to stack

    • What adapter / extension ring would I need to use this flattener with a SBIG STF-8300C on a Stellarvue 90mm Raptor? Thank you in advance for your help. Bob

      Can you please specify the parts needed so I can make a purchase.

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