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 This version of the 13035FF has been replaced by the newer versions that were designed to optimize performance with the newest CMOS cameras with pixel sizes of 3.76 microns and smaller.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

Includes

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

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

Select the Appropriate Adapter to use with Your Camera

• Canon EOS Wide-Mount Camera Adapter with Stainless Steel Bayonet (ADATCCEOS)
• Nikon Camera Adapter with Stainless Steel Bayonet (ADATCCNIK)
• SBIG STL Series Camera with Five-Position Filter Wheel Adapter (ADATCC1)
• Small Cameras with 2" Nosepiece Adapter (ADATCC2)
• SBIG STL Series Camera with Eight-Position Filter Wheel Adapter (ADATCC3)
• QSI’s 500 and 600 series WSG Camera Adapter (A3513-A)

Diagrams and Instruction Sheets

• 130GTX CMOS & CCD System Diagram - Field Flatteners
• 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:

• Field Flatteners, TCCs & QUADTCC Imaging Train Options

• 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