0.72x Quad Telecompressor Corrector for 155f7 StarFire (QUADTCC-155)

Expand your field!   Reduce your f/value, speeding up the collection of photons!  And do it with pin-point stars all the way to the corners of your full frame 35 mm sensor!

In January 2022, we introduced a new version of the 4-element telecompressor corrector that Roland designed to optimize performance for the 155mm f7 StarFire. This is NOT the same design as other QUADTCCS that are offered. It is unique to the 155mm f7 StarFire. Keep in mind that this telecompressor corrector requires a 3.5" connection to your telescope, so these scopes must be updated to the appropriate focuser or adapter: 

• 155mm F7 StarFire EDF.  Has a 4" focuser, so will need our 4" to 3.5" Adapter with Thumbscrews for 4" Focuser (ADA435).
• 155mm F7 StarFire EDFS.  Has a 2.7" focuser, so will need to upgrade to the 3.5" focuser.  

 Construction:

• Four carefully matched glass elements are carefully figured and then coated with the very latest multi-coatings to produce this optical wonder.  All mechanical parts, including the covers, are CNC machined and black anodized with a lustrous finish.
• The male threads are 3.270" x 16

Back-focus Spacers and Focuser Adapters

The following chart shows the back-focus spacing  (as measured from the rear flange of the back-focus spacer) is 80.8 mm +/- 1.0 mm.

Determine the appropriate Back-focus Spacer for the telescope that you plan to use and purchase it separately. 

3.27" Spacer Rings (SRSET-327,  formerly A5025SET)  and  2.7" Spacer Rings (SRSET-27)

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.  A set of three 1 mm thick spacer rings is being offered that can be used in special circumstances to modify the backfocus spacing of the Telecompressor Corrector.

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 EXT327-16.0 Back-Focus Spacer is required for this image train. 

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 the optional 16.0mm Back-focus Spacer (EXT327-16.0), which will provide back-focus spacing of 80.8mm for coupling directly to our camera adapters below. 

• 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)

Diagrams and Instructions

Current recommendations:

• 0.72x QUADTCC Telecompressor Corrector Spacing Requirements - does not include specific information for the QUADTCC-155, however lists options for accessories assuming you have established 80.8mm back-focus spacing.

• Determining Ring Spacing Change 

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

• Field Flatteners, TCCs & QUADTCC Imaging Train Options 

Custom Spacers & Adapters

If you need a spacer or 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

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

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