3.5" Prime Focus Field Flattener for 140 TEC Refractors or 140 StarFire with 4" or 3.5" Focuser (14035FF)
Brand : Astro-Physics
- SKU:
- 14035FF
- Availability:
December 2022 - This field flattener was introduced to optimize performance of the 140mm refractors from Telescope Engineering Company (TEC) or Astro-Physics 140mm f7.5 StarFire with either a 4" or 3.5" focuser.
Field flatteners are designed to accurately compensate for the inherent field curvature of a refractor lens. For each lens design there is an optimal spacing that works best for sharp focus over the specified field size. As camera designs have advanced, the performance requirements have become more stringent. This is now especially important when using the newest CMOS cameras with pixel sizes of 3.76 microns and smaller. This field flattener has been optimized for these 140mm refractors.
Backfocus Spacing from the Rear Flange
The backfocus spacing for these flatteners (as measured from the rear flange) is 3.2597" +/- 1/10" (82.8 mm +/- 2.5 mm). Spacer rings (1mm) are provided to achieve the 80.80mm spacing on which our various adapters are designed.
Applications
DSLR and Mirrorless cameras. Use the appropriate Backfocus Spacer to create a spacing distance of 80.8 mm and then use with the following adapters.
- Canon EOS Camera Adapter with large 1.875" (47.6mm) diameter stainless steel bayonet. For 175TCC, 160TCC and 155TCC and all CCD Flatteners and all QuadTCC Telecompressor Correctors. (ADATCCEOS)
- Nikon Camera Adapter with large 1.73" (44mm) diameter stainless steel bayonet. For 175TCC, 160TCC and 155TCC and all CCD Flatteners and all QuadTCC Telecompressor Correctors. (ADATCCNIK)
- Canon EOS Mirrorless Camera Adapter with large diameter stainless steel “RF” Lens bayonet. For all CCD Flatteners and all QuadTCC Telecompressor Correctors. (ADACAN-RF)
- Nikon Z Mirrorless Camera Adapter with large diameter stainless steel “Z” Lens bayonet. For all CCD Flatteners and all QuadTCC Telecompressor Correctors. (ADANIK-Z)
CCD Camera - Choose the appropriate adapter to space the field flattener properly with your CCD camera. Consult the Diagrams and Instruction Sheets below for a wide variety of options.
14035FF Includes
- Field Flattener housing with optics optimized for this version
- 3.27" Spacer Rings , Set of 3 Rings (SRSET-327)
- Two beautifully machined and black anodized covers
- 14035FF Decal to differentiate from similar assemblies
Required Adapters
Astro-Physics 140 Starfire with 4" Focuser: Will need ADA435, 4" to 3.5" Adapter.
TEC140 scope: You will also need to order a Drawtube Endcap (S35RFAA), shown below, for the focuser. This only applies to the TEC focusers. This part is integral to the Astro-Physics 3.5" focusers and is not needed as a separate purchase. The S35RFAA screws onto the drawtube's 4.100" x 24 thread (same as Starlight Instrument's 3.5" focuser endcap thread).
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Diagrams and Instructions
- Astro-Physics Prime Focus Field Flatteners - Outdated exploded diagram showing the field flatteners with a variety of accessories, but you may own some of these items.
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If you own items not shown in the diagrams above, please refer to the Discontinued Products section of this website and Technical Support for Legacy Products that are No Longer Available
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Custom Adapters
If you need an adapter that is not listed above, we recommend that you contact PreciseParts. Refer to the link for the spacing requirements document above.
