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

Stellarvue Large Format Flattener for 2.5" Focusers - Accepts Standard 42mm T-Rings
Item # SV-SFF3-25-42
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  • This Stellarvue Field Flattener was designed for f/7 refractors with a 2.5" focuser by either Feathertouch or Stellarvue.
  • It threads onto the rear of the focuser and accepts a standard 42mm threaded camera t-ring or adapter.
  • Using a standard t-ring (sold separately), you can attach the appropriate SLR or DSLR to the flattener.
  • CCD cameras may need extra extension rings or adapters. Contact OPT if you need assistance choosing the proper fittings.


A Little Bit About Field Flatteners…

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 2.5” 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 2.5” 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

Additional Information

SKU SV-SFF3-25-42
Manufacturer Stellarvue
Barrel Size Thread-on
Warranty 2 Year Warranty
Included Items

Included Items

  • Stellarvue SFF3-25-42 Field Flattener for 2.5" SV or FT Focusers
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