0.72x Quad Telecompressor Corrector for 155f7 EDFS
0.72x Quad Telecompressor Corrector for 155f7 EDFS
0.72x Quad Telecompressor Corrector for 155f7 EDFS


0.72x Quad Telecompressor Corrector for 155f7 EDFS

Regular price
$ 1,767.00
Sale price
$ 1,767.00
Unit price

This item is a Special Order from the Manufacturer

Special Order

The QUADTCC was previously sold bundled with the Backfocus Spacer Extension, however the adapter is now sold separately here as outlined below. 


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 -element telecompressor corrector that Roland designed for 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.  


  • 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

 Backfocus Spacers and Focuser Adapters

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

Determine the appropriate Backfocus Spacer for the telescope that you plan to use and purchase it separately. If own more than one of the telescopes listed below, you are in luck. Simply purchase the appropriate Backfocus Spacer to use the QUADTCC with that scope as well. 

Scope Focuser or Adapter Required Backfocus Spacer Required Backfocus Spacing Spacing with Backfocus Spacer Spacing without Backfocus Spacer
155 f7 StarFire EDF (4" focuser)  ADA435  EXT327-16.0 16mm  80.8 mm  96.8mm
155 f7 StarFire EDFs (2.7" focuser) 35FOCER-FT  EXT327-16.0  16mm 80.8 mm  96.8mm


Diagrams and Instructions:


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.


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