0.83x CCD Telecompressor Corrector for 110mm f/6 StarFire GTX (110TCC)

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Designed for: 110mm f/6 StarFire GTX

Application: Ideal for digital imaging with DSLR and CMOS cameras.

This optimized 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 diffraction-limited detail over a 35mm full-frame format. All mechanical parts, including the covers, are beautifully machined anodized aluminum with a lustrous black finish: a carapace befitting fine optics.

The 110GTX operating at f/5.0 (0.83x 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.

The 110TCC comes with beautifully machined anodized aluminum covers to match the exemplary design of the flattener’s body.

Back focus distance is 95.5mm.   Back focus distance with the EXT327-14.7 is 80.8mm

The 110FF back focus distance is 95.5mm measured from the back flange to the camera sensor. An extension adapter is available for providing 80.8mm spacing that will use our adapters to match with the 55mm net spacing distance for some popular CMOS cameras. Additional adapter options are available for DSLR cameras.

For use with 35mm DSLR
A 14.7mm Backfocus Spacer (EXT327-14.7) is available to purchase for use with the 110FF.   This 14.7mm spacer provides a back focus spacing of 80.8mm for coupling directly to our 35mm digital camera adapters.

We have adapters available for Canon EOS and Nikon D DSLR cameras, as well as Canon R and Nikon Z Mirrorless versions when using the above Backfocus Spacer. Please see:

  • Nikon D (ADATCCNIK)
  • Canon R (ADAEOS-R) - soon
  • Nikon Z (ADANIK-Z) - soon

For use with 35mm CMOS
Without the EXT327-14.7, back focus spacing is 95.5mm, which was designed to give the user maximum distance for adding specialized camera equipment.

Adapters are available for use with CMOS cameras with thread sizes of 42, 48, 54 and 68mm. These are designed for the popular CMOS cameras currently available that utilize the 55 mm standard spacing.

These adapters are not used with the above Backfocus Spacer, but rather are used with the ADA327-27-L in combination with the ADA27-42/48/54/68 (choose your thread size).

Custom Adapters
If you need an adapter that is not listed above, we recommend that you contact PreciseParts.


Focal ratio: f/5.0
Focal length: 550mm
Backfocus spacing: 3.76" (95.5mm)
Rear thread for adapter: 3.27" x 16 tpi

Image circle: 50mm diameter
Field diameter: 4.5 degrees
35mm format: 3.64 x 2.50 degrees
Pixel scale: 1.40 arcsec/pixel with 3.76-micron pixels

Performance Curves for Imaging at F5 with TCC

RMS Spot Radius Over a 44mm Diameter Field




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