3.5" Prime Focus Field Flattener for 130GTX or prior 130EDFGT upgraded to 3.5" Focuser (13035FF)

December 18, 2022. This version of the 13035FF has been replaced by the newer versions that were designed to optimize performance with the newest CMOS cameras with pixel sizes of 3.76 microns and smaller. We encourage you to select the appropriate version for your refractor. The last 13035FF was shipped 09-07-22. 

Part # 13035FF-2

• 130mm StarFire GTX serial # 130GTX-600 to 130GTX-888. These were shipped from 2015 to Dec 2019. The dew shield does NOT have a thumbscrew for lockdown.
• 130 StarFire GT scope that has been upgraded to our 3.5" focuser.

Part # 13035FF-3

• 130mm StarFire GTX serial # 130GTX-900 and higher. These were shipped from October 2020 to the present. The dew shield includes a thumbscrew for lockdown.

Part # 13027FF-GT

• 130mm StarFire GT scopes with the original 2.7" focuser.

The following historical information is provided for your reference.

The 130 GTX images at f/6.7 with the Flattener. 

Conveniently, it uses the same camera adapters as the newer 13035FF-2 and 13035FF-3 as well as older adapters for the QUADTCC (and those of the flatteners and TCCs of the 160 and 175 Starfires). 

Use with these scopes

• 130GTX
• 130EDFGT that has been upgraded to 3.5" focuser

13035FF Includes

• 22.1mm extension (also sold separately as EXT327-22.1)
• Machined covers

Specifications

The backfocus spacing from the rear flange is:
With Backfocus Spacer - 80.8 mm +/- 2.5 mm
Without 22.1mm Backfocus Spacer - 102.9 mm +/- 2.5 mm

Field of View with 130 StarFire GTX and 3.5" Field Flattener

Use with CMOS & CCD Cameras

Adapters are available for use with CMOS & CCD cameras with thread sizes of 48, 54 and 68mm. These are designed for the popular CMOS cameras currently available that utilize the 55mm standard spacing. The EXT327-22.1 Back-focus Spacer is required for this image train. Refer to the 130GTX CMOS & CCD System Diagram - Field Flatteners

• ADA327-48, 3.27" to M48 Adapter (new July 2024)
• ADA327-54, 3.27" to M54 Adapter (new July 2024)
• ADA327-68, 3.27" to M48 Adapter (new July 2024)

Use with Canon EOS and Nikon DSLR and Mirrorless Cameras

We recommend using the 22.1mm Back-focus Spacer (EXT327-22.1), which will provide back-focus spacing of 80.8mm for coupling directly to our camera adapters below. Refer to the 130GTX CMOS & CCD System Diagram - Field Flatteners

• Canon EOS DSLR Camera Adapter with large 1.875" (47.6mm) diameter stainless steel bayonet. (ADATCCEOS)
• Nikon DSLR Camera Adapter with large 1.73" (44mm) diameter stainless steel bayonet. (ADATCCNIK)
• Canon EOS Mirrorless Camera Adapter with large diameter stainless steel “RF” Lens bayonet. (ADACAN-RF)
• Nikon Z Mirrorless Camera Adapter with large diameter stainless steel “Z” Lens bayonet. (ADANIK-Z) 

Custom Adapters

If you need an adapter for a configuration that is not described above, we recommend that you contact PreciseParts. 

Optical Spacer Rings (Part #SRSET-327)

In most imaging setups it will not be necessary to modify the spacing distance. However, there may be some sensor/camera combinations that can benefit by making slight changes to this spacing. You may wish to consider a set of three 1 mm thick spacer rings to adjust the back-focus spacing of the Telecompressor Corrector, as needed

Diagrams and Instructions

• 130GTX CMOS & CCD System Diagram - Field Flatteners
• 130GTX DSLR and Mirrorless Camera System Diagram
• 13035FF Spacing Requirements - information about previous adapters
• Optimizing Your Field Flattener or Telecompressor Corrector (TCC)

Legacy documents for your reference in case you own some of these components:

• 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. 

Astro-Physics 80.8mm Back-focus Spacing Distance

For more information regarding the concept for the 80.8mm back-focus spacing distance, refer to this webpage: Spacers & Extensions