Ioptron Photron 304mm F/8 Ritchey-chretien Telescope Ota
- Product Code: eq68856
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The iOptron Photron 304mm f/8 Ritchey-Chretien Telescope OTAbuilds on the success of the solid tube models in the series with a completely redesigned housing that utilizes an open truss system to improve the overall thermal dynamics that allow the optical system to settle into the ambient temperature faster and resist heating up better than traditional closed steel tubes. The carbon fiber tubes are also thermally stable so they won't expand and contract like metal does, ensuring accurate alignment throughout the night and throughout the year. Intended for those who have a solid and reliable support system, iOptron is offering the RCT here as an optical tube assembly (OTA)-only option. A long Losmandy-style dovetail plate is factory installed to make it compatible with a wide variety of heavy-duty mounts that can carry a minimum payload of at least 44 pounds.
As with all Photrons, the Ritchey-Chretien (RCT) optical system utilizes the same hyperbolic primary and secondary mirror design used in the Hubble Space Telescope, the Keck telescopes, and the ESO Very Large Telescope to deliver the wide field of view and superb performance advanced amateur astronomers and imagers demand. Complementing the improved heat management of the open truss system are low thermal-expansion quartz primary and secondary mirrors and three cooling fans that further help keep the optical system cool during long observation sessions. Each mirror is treated with highly reflective dielectric coatings that maximize the light being transmitted, so greater than 99% of the available light makes it to your eye or imaging sensor. All of this translates to bright and sharp high-contrast views or images with accurate color fidelity across the entire wide distortion-free field of view. The 12" aperture has the light-gathering capability required to see dim deep-space objects like galaxies with a respectable f/8 focal ratio that is ideal for long-exposure astrophotography techniques.
Unlike other catadioptric designs, this RCT has a fixed primary mirror to eliminate the image shift that is common with conventional configurations that move the mirror forward and back to focus the image. With the primary mirror fixed in place, iOptron opted for 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 binary stars. To ensure complete coverage of today's imaging sensors, the focuser has a large 3" drawtube and comes with three extension rings to help users achieve the proper back focus distance. The larger drawtube also allows the use of large eyepieces, which generally have longer eye reliefs to make visual observations much more comfortable, and comes with a 1.25" reducer to enable the smaller and more common-sized eyepieces and accessories to be easily used.
Open Carbon-Fiber Truss Tube System Better Thermal Dynamics than Solid Tubes 304mm Ritchey-Chretien Catadioptric OTA 2432mm Focal Length, f/8 Focal Ratio Low Thermal-Expansion Quartz Mirrors Dielectric Mirror Coatings 10:1 Dual-Speed Crayford Focuser Primary Mirror Cooling Fan System Losmandy-Style Dovetail Mounting Plate OTA Only; Mount and Tripod Required
Key Specs | |
---|---|
Optical Design | Ritchey-Chretien |
Aperture | 304 mm / 12" |
Focal Length | 2432 mm |
Focal Ratio | f/8 |
Focuser | Dual-Speed Crayford |
GoTo Capability | No |
Battery | No |
Weight | 78 lb / 35.4 kg |
Optical Tube Assembly | |
Optical Design | Ritchey-Chretien |
Aperture | 304 mm / 12" |
Focal Length | 2432 mm |
Focal Ratio | f/8 |
Focuser | Dual-Speed Crayford |
Diagonal | No |
Finderscope | No |
Mounting | Losmandy Style |
Optical Tube Dimensions | Length: 33.5" / 850 mm |
Mount | |
GoTo Capability | No |
General | |
Battery | No |
GPS | No |
Mobile App Compatible | No |
Weight | 78 lb / 35.4 kg |
- Open truss tube design for improved thermal dynamics, allowing the optical components to adapt and settle to the ambient temperature much faster and resist heating versus conventional closed steel or aluminum tubes
- Carbon fiber truss tubes offer greater thermal stability than steel or aluminum without sacrificing strength, ensuring accurate optical alignment when transitioning between inside and outside as the temperature drops overnight during observation sessions and as the temperature fluctuates with the seasons throughout the year
- Large 304mm (12") aperture enables easy viewing of celestial bodies within the solar system like the moon and planets with the ability to resolve dim deep-sky objects like wispy nebulae and galaxies
- Long 2432mm focal length provides a high magnification potential and moderate focal ratio for astrophotography
- f/8 focal ratio is ideal for long-exposure astrophotography techniques used for faint deep-space objects
- Ritchey-Chretien catadioptric design delivers views free from off-axis comas and spherical and chromatic aberrations
- Low thermal-expansion quartz primary and secondary mirrors limit distortion as the mirrors heat
- Highly reflective dielectric mirror coatings transmit more than 99% of incoming light to ensure bright and clear images
- Fixed-position primary mirror eliminates image shift common in other catadioptric designs
- Three integrated primary mirror cooling fans reduce acclimation time and help to eliminate distortion due to mirror heating; runs on eight user-supplied AA batteries
- 10:1 dual-speed linear-bearing Crayford focuser provides tack-sharp focusing, allowing for fast coarse and precise fine focus without backlash
- Tension-adjustment knob and drawtube lock knob
- Large-diameter 3" drawtube maximizes light throughput and ensures complete coverage of imaging sensors to eliminate or limit vignetting during astrophotography/imaging
- Drawtube has an etched scale in inches and millimeters for precise focus repeatability
- 2" compression ring holder allows the use of larger eyepieces and accessories like diagonals and Barlows to make viewing easier and more comfortable
- 1.25" reducer adapter enables the use of the more common size of eyepieces and accessories
- Two 1" and one 2" stackable extension tubes provided to fit between the threaded back and focusing assembly provide additional back-focus distance to ensure the focal plane properly lands on imaging sensors for imaging if required
- Compatible with an optional ASCOM-compliant electronic focuser
- Optical tube assembly only—mount and tripod required for proper use
- 17" long Losmandy-style dovetail plate is compatible with larger high-payload capacity mounts to handle the weight of the OTA and imaging rigs
- Length: 33.5"
- Weight: 44 pounds
Related Questions and Answers
Q: 1. they are making shipments to Mexico?
A: B&H will ship the iOptron Photron 150mm f/9 Ritchey-Chrétien Catadioptric Telescope (OTA Only) BH #IO6111 • MFR #6111 to Mexico via DHL
Q: 2. 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: 3. 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: 4. What materials are the tube and cradle rings made of?
A: Explore Scientific FirstLight 150mm f/5 Reflector Telescope has an aluminum tube and cradle rings.
Q: 5. What type of finder scope and diagonal are required to use this scope? As in, what are the specifications to purchase the right items to fit on the scope?
A: On the diagonal. You have to decide on 45 degrees or 90 degrees. also a regular diagonal or an erecting prism diagonal. When you look through a telescope the view is always inverted with out the use of some kind of erecting device. B&H most popular finder scope is the Celestron StarPointer Finderscope BH #CEFSSP • MFR #51630 https://www.bhphotovideo.com/c/product/202036-REG/Celestron_51630_Star_Pointer_Finderscope.html https://www.bhphotovideo.com/c/product/202036-REG/Celestron_51630_Star_Pointer_Finderscope.html
Q: 6. 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: 7. Is this unitmade in japan?
A: The Vixen Optics R130SF 130mm f/5 Reflector Telescope is made in China.
Q: 8. 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: 9. What is the maximum effective magnification? on the iOptron website I see 180 but I would expect around 300, from a 6" telescope. Can you please clarify?
A: The magnification is approximately 27X without an eyepiece. That now changes when you add the magnification of the eyepiece into the equation.
Q: 10. If it weighs 18 lbs. why does it say its Package Weight is 15 lbs?
A: A correction order has been submitted to the B&H web content team.
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