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• Reverse Port Ring, 2.7"-24tpi A-P, female, Item RR2724: $89
• Reverse Port Ring, 2.7"-16tpi Meade refractor, female, Item RR2716: $89
• Reverse Port Ring, 72mm-1mm thread pitch, Takahashi, female, Item RR72: $99
• Reverse Port Ring, 3.25"-16tpi, Meade Large-Format SCT, male, Item RR325: $99
• Reverse Port Ring, 3.29"-16tpi Celestron L-F SCT, male, Item RR329: $99

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• 1-inch Extension, 2.9" diameter flange, Item EXT1: $89
• 2-inch Extension, 2.9" diameter flange, Item EXT2: $99
• Port rings required to attach Targetron to your specific scope & camera
• Don't see your port ring listed above - E-mail or call us. We'll machine one.

Targetron, Sidewinder & Zerotator Port Rings

Reverse Port Rings are the reverse thread (male or female) to its matching counterpart - Docking Port Rings. They are inserted in the rear camera port to continue your imaging train using the same large-format threaded coupling as the input before the Targetron. You can then install a focal reducer, that needs a preset distance between itself and your camera, after the Targetron, etc. You could even install one of our MicroGlide Focusers on the output of the Targetron creating a secondary auto-focuser, without the hassle of modifying your scope's existing primary focuser. Just dock an auto-focus Epsilon or Omicron focuser to the output camera port of the Targetron and you're instantly auto-focusing your CCD camera. It looks really cool, too. See above for picture and info on this special Targetron/Epsilon or Omicron auto-focus installation.

Reverse Port Ring, 2.7"-24tpi A-P refractor, female, Item RR2724: $89 This reverse port ring will continue your existing focuser's threaded coupling format on AstroPhysics refractors that use their proprietary female 2.7"-24tpi thread configuration. For more info on selecting the correct adapters, see Questions & Answers FAQ link: "How do I know which threaded adapter to purchase for my specific scope?" After installing this reverse port ring into the Targetron's rear port, tighten the three 8-32 set screws on the Targetron's inner cylinder using the included Allen wrench. DO NOT OVERTIGHTEN! Then simply screw in your threaded AP focal reducer or other accessory that conforms to the AP 2.7"-24tpi format.

Reverse Port Ring, 2.7"-16tpi Meade refractor, female, Item RR2716: $89 This reverse port ring will continue your existing focuser's threaded coupling format on Meade refractors that use their proprietary female 2.7"-16tpi thread configuration. For more info on selecting the correct adapters, see Questions & Answers FAQ link: "How do I know which threaded adapter to purchase for my specific scope?" After installing this reverse port ring into the Targetron's rear port, tighten the three 8-32 set screws on the Targetron's inner cylinder using the included Allen wrench. DO NOT OVERTIGHTEN! Then simply screw in your threaded Meade component that conforms to the Meade 2.7"-16tpi format.

Reverse Port Ring, 72mm-1mm thread pitch, Takahashi, female, Item RR72: $99 This reverse port ring will continue your existing focuser's threaded coupling format on Takahashi refractors that use their proprietary female 72mm-1mm thread configuration. For more info on selecting the correct adapters, see Questions & Answers FAQ link: "How do I know which threaded adapter to purchase for my specific scope?" After installing this reverse port ring into the Targetron's rear port, tighten the three 8-32 set screws on the Targetron's inner cylinder using the included Allen wrench. DO NOT OVERTIGHTEN! Then simply screw in your threaded Takahashi focal reducer or other component that conforms to the Takahashi 72mm-1mm format.

Reverse Port Ring, 3.25"-16tpi, Meade Large-Format SCT, male, Item RR325: $99 This reverse port ring will continue your existing SCT's threaded visual back coupling on Meade 10" and 12" SCTs that use their proprietary female 3.25"-16tpi male thread configuration. For more info on selecting the correct adapters, see Questions & Answers FAQ link: "How do I know which threaded adapter to purchase for my specific scope?" After installing this reverse port ring into the Targetron's rear port, tighten the three 8-32 set screws on the Targetron's inner cylinder using the included Allen wrench. DO NOT OVERTIGHTEN! Then simply screw in your threaded Meade component that conforms to the Meade 3.25"-16tpi format on your SCT's visual back. The profile of the coupling is about 1/8-inch.

Reverse Port Ring, 3.29"-16tpi Celestron L-F SCT, male, Item RR329: $99 This reverse port ring will continue your existing SCT's threaded visual back coupling on Celestron 11" and 14" SCTs that use their proprietary female 3.29"-16tpi thread configuration. For more info on selecting the correct adapters, see Questions & Answers FAQ link: "How do I know which threaded adapter to purchase for my specific scope?" After installing this reverse port ring into the Targetron's rear port, tighten the three 8-32 set screws on the Targetron's inner cylinder using the included Allen wrench. DO NOT OVERTIGHTEN! Then simply screw in your threaded Celestron component that conforms to the Celestron 3.29"-16tpi formaton your SCT's visual back The profile of the coupling is about 1/8-inch.

Extension Flange, 3" Outside Diameter for Targetron/Sidewinder rear ports This extension flange has a male 2.9" outside diameter circular dovetail flange on one end, and a 2.9" inside diameter on the other. It will extend the rear port of the Targetron to accommodate special reverse parfocusing requirements. Normal installations should not require this extension, but in some circumstances, this may be the only solution. It should not be used unless necessary because it extends your profile, which is a NO-NO! However, if you can spare the profile, and need this extension to address a reverse parfocusing issue, then this extension flange may be what you need. 1" Extension Flange (shown), Item EXT1: $79 2" Extension Flange, Item EXT2: $89