0.79x Tri-TCC Telecompressor Corrector for 130GTX serial # 130GTX-900 or higher (also 886,887,888) and any 130EDFGT upgraded to 3.5" Focuser (13035TCC-3)

The 13035TCC-3 Tri-TCC was introduced in July 2024 in response to requests for higher performance when using the latest CMOS cameras. 

Application: Ideal for imaging with CMOS, DSLR and mirrorless cameras.

This optimized Tri-TCC design uses three matched glass elements assembled into an air-spaced Super ED triplet lens assembly to produce an F/5 photographic speed. The telecompressor design uses Lanthanum high-index glass and high-grade SD elements to produce sharp detail over a 35mm full-frame format. All mechanical parts, including the covers, are beautifully machined anodized aluminum with a lustrous black finish. The barrel design uses a unique dovetail for quick attachment to the focuser without introducing tilt into the optical system.  

The 130GTX operating at f/5.0 (0.79x compression) is an ideal match for the full-format CMOS cameras currently popular amongst astro-imagers. Extreme detail can be captured in very short time thanks to the fast focal ratio. This accessory is a must for fastidious astro-imagers, as the TCC provides an extended color-correction range far beyond the visible range, producing high-resolution images from the latest technology in CMOS sensors. Wide-field images will be highly detailed which allows the astro-imager to make very large prints without doing time-consuming mosaics. 

Choose the appropriate version for your refractor

For the 130GTX, look closely at your dew shield, in most cases, to determine which version you need. You may also refer to your original sales order. The serial number is difficult to see on the lens. 

Part # 13035TCC-2

• 130mm StarFire GTX serial # 130GTX-600 to 130GTX-885 (shipped from 2015 to Dec 2019) and 130GTX-889 and 130GTX-890 (shipped 2024). The dew shield does NOT have a thumbscrew for lockdown.

Part # 13035TCC-3

• 130mm StarFire GTX serial # 130GTX-886, 130GTX-887 and 130GTX-888 shipped in Fall 2019.  The dew shield does NOT have a thumbscrew for lockdown.
• 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. 
• 130mm StarFire GT scope that has been upgraded to our 3.5" focuser. (04-22-23: Correction made to show that 13035FF-3 is the correct version for these scopes)

13035TCC-3 Includes

• 130TCC housing with optics optimized for this version. 
• Two beautifully machined anodized aluminum covers
• 13035TCC-3 Decal to differentiate from similar assemblies

Back-focus spacing from the rear flange

• Back-focus distance is 102.9mm - measured from the back flange of the TCC to the camera sensor.  
• Back-focus distance with the optional EXT327-22.1 is 80.8mm - we offer adapters for popular CMOS cameras as well as Nikon and Canon EOS DSLR and mirrorless cameras. These adapters are described below.

Use with CMOS Cameras up to 35mm

Adapters are available for use with CMOS 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 System Diagram.

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 35mm DSLR and Mirrorless Cameras

We recommend the optional 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 DSLR and Mirrorless Camera System Diagram. 

• 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. You may also review the following diagram that shows additional components you might find useful. Keep in mind that some are legacy parts: Field Flatteners, TCCs & QUADTCC Imaging Train Options

Diagrams and Instructions

Current recommendations:

• 130GTX CMOS System Diagram
• 130GTX DSLR and Mirrorless Camera System Diagram
• Optimizing Your Field Flattener / Lens / Camera Combination

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