Eliminate vibrations and achieve finer and more precise focusing on your 6, 8, or 10" Photron Ritchey-Chrétien telescope with iOptron's Electric eFocuser. Once installed on the OTA, the unit plugs into the auxiliary port on compatible mounts for power, and allows it to be controlled using the Go2Nova computer hand controller running the current firmware version. A precise stepper motor with a synchronous drive belt delivers three speeds — low, medium, high — without vibration or noise. While the eFocuser is primarily designed for the iOptron Photron Ritchey-Chrétien series telescopes, it will also fit other RC scopes such as GSO, OPT's TPO, Astronomics' Astro-Tech, and Orion; it may work with other RC scopes that use the similar dual-speed focuser.

Using an electric focuser eliminates the need to touch knobs which cause vibration and allows a level of precision that hand-focusing is usually unable to achieve. The eFocuser also locks the position when the control button is released to eliminate backlash — a valuable function for astrophotography or when trying to resolve dim or close objects like binary stars or cluster

Stepper Motor with Synchronous Belt    Precise Focusing with Zero Backlash    Quiet Running Motor Drive    Low, Medium, High Speeds    Use with Go2Nova Hand Controller    No External Power Required

• CEM25/CEM25P/CEM25EC
• CEM60/CEM60EC
• iEQ30 Pro
• iEQ45 Pro
• May work with other OTAs that use a similar dual-speed focuser
• May require update to the most current hand controller firmware

Related Questions and Answers

Q: 1. My mount is cem26 and the diameter of the counterweight shaft is 20mm. Does this counterweight fit?

A: Yes. The iOptron 3-Pound Counterweight is compatible with the iOptron CEM26 mount.

Q: 2. Thanks for the detailed answers so far. I consider replacing my Celestron slt5 (similar to 127 sllt but Shmidt Casagrian) with this tube (150 RC f/9). Howwvar I am not sure if I'll have a significant improvement in visible result. Though I ma tempted for the doual speed focuser. Can you lease advice?

A: You will have about a 17 to 22% increase in brightness. The brighter the scope the more objects can be seen and identified.

Q: 3. Would this fit in a Skywatcher eqm35 pro ?

A: That is not listed as compatible.

Q: 4. What is the maximum effective magnification? I am asking since at the iOptron website its wriiten 180, however other 6" telescopes usually have around 300 max effective magnification. Thanks

A: The stated lower magnification could be because of the stated shorter focal length of the OTA.

Q: 5. 2. I have a Celestron Nexstar 5SLT, and I wonder if I can purchase RC6 and use the same Tripod & Mount of the 5SLT, as my budget is limited (I am not going to add an SLR camear on the mount)? If not, please advise. on alterantive.

A: Yes this OTA has a Vixen Style Mount, so it will mount onto that Tripod set up.

Q: 6. Will the 8" version fit in the iOptron CEM26 mount? The Losmandy-Style Dovetail looks wider.

A: The iOptron Photron 200mm f/8 Ritchey-Chrétien Catadioptric Telescope (OTA Only) BH #IO6112 • MFR #6112 comes with a universal size Losmandy-Style Dovetail Mounting Plate

Q: 7. I own the Celestron Nexstar 4SE and wondering if I can use my tripod with this OTA?

A: Probley not. Your tripod head would have to be able to accept Long Vixen-style dovetail plate.

Q: 8. Is the focuser and the primary mirror threaded together? meaning are they coupled in such a way, when the focuser moves primary mirror moves with it? Thanks

A: No, when using the iOptron Photron 250mm f/8 Ritchey-Chrétien Catadioptric Telescope the focuser and the primary mirror are not threaded together. iOptron describes it this way: "With the primary mirror fixed in place, iOptron installed a precise two-speed Crayford-style focuser with a 10:1 reducer that allows for fast coarse and precise fine focusing without the backlash that occurs in the more common rack-and-pinion design—essential for astrophotography or splitting objects that are close together, like binary stars."

Q: 9. Can I take parts and reduce weight to 11 pounds when shooting, put a camera and then put it on the sky watcher az gti?

A: This would not be possible to do, as there really are no parts to remove.

Q: 10. Will I need this additional counterweight to balance a 5.2lb setup on the Skyguider Pro? The tracker already comes with one, but I'm not sure if it will be enough to balance the mount.

A: It will depend on the items you are mounting.