iOptron Photron 200mm f/8 Ritchey-Chrétien Catadioptric GoTo EQ Telescope

iOptron Photron 200mm f/8 Ritchey-Chrétien Catadioptric GoTo EQ Telescope

iOptron Photron 200mm f/8 Ritchey-Chrétien Catadioptric GoTo EQ Telescope

B&H # IOP200RCT MFR # 12200
Special Order
Expected availability: 2-4 weeks

Product Highlights

  • 200mm Ritchey-Chrétien Catadioptric OTA
  • 1624mm Focal Length, f/8 Focal Ratio
  • Precise 10:1 Dual-Speed Crayford Focuser
  • iEQ45 Pro Motorized EQ GoTo Mount
  • 359,000+ Object Computer Controller
  • Multiple Alignment Assistance Options
  • 3-Speed Zero-Backlash Electronic Focuser
  • 1.25" Eyepiece and Dielectric Diagonal
  • 6x30 Finderscope with Bracket
  • 2" Stainless Steel Tripod with Tray
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Options: iEQ45 Pro GoTo EQ Mount, 2" Tripod

CEM25P GoTo EQ Mount, 2" Tripod

Not available with current selections

CEM60 GoTo EQ Mount, Tri-Pier

Not available with current selections

OTA Only

Special Order

iEQ45 Pro GoTo EQ Mount, 2" Tripod

Aperture: 200mm (8"), f/8

150mm (6"), f/9

Not available with current selections

200mm (8"), f/8 250mm (10"), f/8

Not available with current selections

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iOptron Photron overview

  • 1Description

Combining a precision large-aperture optic with a full-featured GoTo mount, plus a suite of useful accessories, the iOptron Photron 200mm f/8 Ritchey-Chrétien Catadioptric GoTo EQ Telescope (RCT) is a complete system ideally suited to visual observation or astrophotography. Mounting the superior optics of the RCT on a fully motorized equatorial mount allows users to accurately track objects for long periods of time without the field rotation that happens when using alt-azimuth mounts. Without the field rotation, long exposure times of several minutes can be used without star streaking or blurring. Added to the optical tube assembly, mount, and sturdy tripod, iOptron includes a precision electronic focuser, an eyepiece and diagonal, and a finderscope and bracket.

  • Photron 200mm f/8 Ritchey-Chrétien Catadioptric Telescope (OTA Only)

    Utilizing the same hyperbolic primary and secondary mirror design used in the Hubble Space Telescope, the Keck telescopes, and the ESO Very Large Telescope, the iOptron Photron 200mm f/8 Ritchey-Chrétien Catadioptric Telescope (RCT) represents the medium-aperture class in the series and is ideally suited for both stargazing and astrophotography. Despite its larger mirror and long focal length, it delivers views that are free from off-axis comas and spherical and chromatic aberrations, yet maintains a highly portable form factor. The low thermal-expansion quartz primary and secondary mirrors are treated with highly reflective dielectric coatings that, when combined with internal knife-edge baffles, limit distortion as the mirrors heat while limiting stray internal light and maximizing light transmission. All this translates to bright and sharp high-contrast images with accurate color fidelity across the entire distortion-free field of view.

    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 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. To ensure complete coverage of today's imaging sensors, the focuser has a 2" 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.

    Intended for those who have a reliable support system, iOptron offers 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 heavier-duty alt-azimuth, equatorial, and GoTo mounts that can carry a minimum payload of at least 18 pounds. To make adding accessories, such as a smaller guide scope, or to piggyback imaging or DSLR cameras for wide-field photography, a smaller Vixen-style dovetail plate is also pre-installed on the top of the OTA.

    Optical Tube Assembly
    • Large 200mm (7.9") clear aperture provides performance while keeping the OTA portable; 95mm secondary mirror
    • Long 1624mm focal length provides a moderate magnification potential and focal ratio for astrophotography
    • Moderate f/8 focal ratio allows for shorter exposure times for imaging than slower OTAs
    • Ritchey-Chrétien 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
    • 10 internal knife-edge baffles diminish stray light, improving contrast for visual and imaging applications
    • Fixed-position primary mirror eliminates image shift common in other catadioptric designs
    • Resolution: 0.58 arcsec
    • 10:1 dual-speed linear-bearing Crayford focuser allows for fast coarse and precise fine focus without backlash for tack-sharp focusing; with tension-adjustment knob and drawtube lock knob
    • Large 2" drawtube ensures complete coverage of imaging sensors to eliminate or limit vignetting and allows the use of larger eyepieces to make viewing easier and more comfortable; with etched scale in inches and millimeters for precise repeatability
    • Factory-installed mounting plate for user-supplied finder
    Mounting
    • Optical tube assembly onlymount and tripod required for proper use
    • Long Losmandy-style dovetail plate is compatible with the most popular-sized saddles on alt-az, equatorial, and GoTo mounts
    • Weight: 18 pounds
    • Secondary upper Vixen-style dovetail plate enables easy mounting of smaller guide scopes or piggybacking imaging or DSLR cameras for wide-field astrophotography
    Included Accessories
    Reducer Adapter:
    • 2"-to-1.25" reducer allows the use of the smaller, more common-sized accessories and eyepieces in the larger focuser drawtube
    Extension Rings:
    • Three focuser rings allow for increased back-focus distance to ensure the focal plane properly lands on imaging sensors or specialized visual equipment
    • Rings can be used one at a time or stacked as needed
    • Simple screw-together design requires no tools or permanent modification
    • Includes two (2) 1" tubes and one (1) 2" tube

     

    UPC: 813578010636
  • iEQ45 Pro GoTo Equatorial Mount with Tripod

    Conceived, designed, and built for entry-level to intermediate astrophotographers, the iEQ45 Pro GoTo Equatorial Mount with Tripod from iOptron is outfitted with precision motors, zero-backlash gears, and a computer controller to provide an ideal platform for imaging. The mount has a dual dovetail saddle that fits both Losmandy- and Vixen-style plates for mounting compatible optical tube assemblies (OTAs). With a maximum payload capacity of 45 lb, it can easily hold large telescopes, counterweights, and accessories. It features a motorized equatorial mount, the Go2Nova 8407+ computer hand controller, a 2" stainless steel adjustable-height tripod, and an illuminated polar axis scope for faster alignment and setup. The mount has a built-in 32-channel GPS receiver that sends your location and time to the Go2Nova hand controller, so the telescope can be set up quickly.

    The included dark-field illuminated AccuAligning polar axis scope installs through the body of the mount for accurate initial manual alignment and alignment verification and correction during observation and imaging sessions. The iEQ45 is built for precise tracking, as required during long-exposure astrophotography, with highly accurate stepper motors and the ability for you to program out the Periodic Error Correction (PEC) common to all worm gears.

    Its dual-axis 1.8° stepper motor is controlled by the Go2Nova 8407+ hand controller. This system has an internal database of 359,000+ celestial objects, with 60 user-defined objects to program yourself. The hand controller has updatable firmware through the built-in serial port. With nine slew speeds and automatic tracking capabilities, finding and keeping objects centered in the field of view is easy no matter whether you're viewing the fast-moving Moon or much slower deep-space subjects. An adjustable-height stainless steel tripod is included for the mount and your telescope.

    Mount
    • Motorized and computer-guided equatorial mount with 45 lb payload capacity
    • 6" Losmandy/Vixen dual saddle accepts any compatible OTA up to 60 lb
    • AccuAligning polar scope with dark-field illumination for polar alignment
    • Gear switches on both right ascension (RA) and declination (dec) axes for fast movement
    • Built-in 32-channel GPS receiver communicates information to the Go2Nova controller
    • Accurate tracking with temperature-compensated crystal oscillator (TCXO)
    • Integrated bubble level
    Motors and Gears
    • Precision stepper motors with 0.09 arcsecond accuracy for precise GoTo capability and accurate tracking
    • Zero-gap RA and dec worm gear ensures perfect gear meshing with no backlash
    • 256-tooth RA and 228-tooth dec aluminum worm wheels
    • Screw/worm-type latitude adjuster for precision adjustments, 5-70° range
    • Permanent Periodic Error Correction (PPEC) removes inaccuracies inherent in gears and allows for more accurate tracking, especially for long-exposure astrophotography
    • Slew speed and direction controlled via Go2Nova controller
    • 110-240 VAC and 12 VDC with car accessory plug power adapters included
    Go2Nova 8407+ Hand Controller
    • 359,000-object database
    • User-friendly menu-driven interface
    • Multiple tracking rates including Sidereal, Solar, Lunar, King's, and user defined
    • 9-speed slew control with quiet mode, up to 5.83°/s max
    • Database includes stars, constellations, and seven complete astronomical catalogs including Messier and NCG IC
    • Up to 60 user-defined objects to easily find your favorites
    • Enter specific RA and dec coordinates of objects for immediate GoTo
    • 8-line, 21-character/line, red-light backlit LCD screen
    • One-star, multi-star, polar, and SolarSys alignments
    • Updatable firmware through built-in serial port
    • Computer control with planetarium software
    • Integrated ST-4 autoguiding port capable of reverse guiding with auto-protection
    • Built-in heater for wider operating temperature range
  • Electric eFocuser for Photron Ritchey-Chrétien Telescopes

    Eliminate vibrations and achieve finer and more precise focusing on your 6, 8, or 10" Photron Ritchey-ChrĂŠtien 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-ChrĂŠtien 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

    Compatible Mounts
    • 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
    UPC: 813578010711
  • 52° 25mm Plossl Eyepiece (1.25")

    The iOptron 52° 25mm Plossl Eyepiece is designed for comfortable near and deep-space astronomical observation. The relatively long focal length will produce a moderate magnification on most OTAs, making it a versatile addition to any astronomer's kit.

    It is engineered with anti-reflective fully multi-coated optical surfaces to ensure bright and clear high-contrast images with true color transmission across the entire 52° field of view. With a 1.25" diameter barrel, it will fit the most common size drawtubes, visual backs, and accessories. The housing has a textured collar for safe handling in the cold, and a fold-down eyecup makes this eyepiece comfortable when viewing for extended periods with or without eyewear.

    UPC: 813578010698
  • 90° Dielectric Star Diagonal (1.25")

    Use the iOptron 90° Dielectric Star Diagonal to place your head in a comfortable viewing position when your refractor or catadioptric optical tube assembly (OTA) is aimed at or near the zenith. Built with a dielectric hard-coated BK-7 glass mirror, the diagonal transmits more than 99% of the incoming light to ensure clear and bright high-contrast images while maintaining maximum resolution.

    Designed to be lightweight and durable, the diagonal features an aluminum housing with a black anodized finish. The 1.25" barrel and eyepiece holder makes it compatible with the most popular size focusers, drawtubes, and accessories; and the brass compression ring in the eyepiece holder ensures your eyepieces won't get marked or marred when locked into place. An internal integrated safety stop in the eyepiece holder protects the mirror and ensures a long life.

    UPC: 813578010674
  • 6x30mm Finderscope with Bracket (Red)

    With a wide field of view and low-profile aperture, the iOptron 6x30mm Finderscope is an ideal finder for star-hopping navigation that won't add excessive weight or bulk to your OTA. It comes with its own bracket that is outfitted with a dovetail mount for compatibility with a wide array of finder saddles, and three thumbscrews that enable precise alignment with the OTA.

    UPC: 813578010650
In the Box
Bundle Items
  • 2" Extension Ring
  • 2 x 1" Extension Rings
  • Limited 1-Year Warranty
  • Go2Nova 8407+ Hand Controller
  • Losmandy/Vixen Dual Saddle
  • LED with cable for Polar Scope
  • 2 x Controller Cables
  • RS232 to RJ9 Cable
  • 12 VDC Car/Vehicle Power Adapter
  • AC Adapter (1.25A)
    2 x
  • 11 lb Counterweight for iEQ45/CEM60 EQ Mounts
  • Counterweight Shaft
  • 2" Steel Tripod for iEQ45 and CEM60
  • Limited 2-Year Warranty
  • Pulley
  • Control Cable
  • Synchronous Belt
  • Limited 1-Year Warranty
  • 2 x End Caps
  • Limited 1-Year Warranty
  • Limited 1-Year Warranty
  • Mounting Bracket
  • Limited 1-Year Warranty
Table of Contents
  • 1Description
  • Photron 200mm f/8 Ritchey-Chrétien Catadioptric Telescope (OTA Only)
    Optical Design Ritchey-Chretien catadioptric
    Aperture 200mm
    Focal Length 1624mm
    Focal Ratio f/8.1
    Eyepiece Barrel Diameter 2"
    1.25" with included reducer
    Diagonal None
    Finderscope None
    Tripod None
    Mount Type Losmandy-style dovetail plate
    Power Source N/A
    Optical Tube Length 22.0" / 55.9 cm
    Weight 18.0 lb / 8.2 kg
  • iEQ45 Pro GoTo Equatorial Mount with Tripod
    Mount Type Equatorial
    Load Capacity 45 lb (20.4 kg)
    Right Ascension Axis Worm gear: 256-teeth, aluminum, M=0.5
    Worm: 0.7" (1.7 cm), brass
    Period: 337 S
    Bearing: 3.1" (8.0 cm)
    Shaft: 2.0" (5.0 cm), steel
    Declination Axis Worm wheel: 228-teeth, aluminum, M=0.5
    Worm: 0.7" (1.7 cm), brass
    Bearing: 2.7" (6.8 cm)
    Shaft: 1.6" (4.0 cm), steel
    Resolution 0.09 arcsecond
    Adjustment Range Latitude: 5 to 70°
    Azimuth: ±6°
    GPS Internal 32-Channel receiver
    Motor 1.8° stepper motor, 128 microsteps
    GoTo Capability Yes, Go2Nova 8407+ hand controller
    Polar Axis Scope Yes, AccuAlign G2 polar scope with dark-field illumination
    Includes Tripod/Pier Yes
    2.0" (5.1 cm) diameter legs, adjustable-height stainless steel
    Losmandy/Vixen-style spring-loaded dual saddle
    Operating Temperature -4 to 113°F (-20 to 45°C)
    Power Adapter:
    • In: 100 - 240 VAC
    • Out: 11 - 15 VDC, 2 A

    Consumption:
    • Tracking: 0.45 A
    • GoTo: 0.75 A

     

    Dimensions Base diameter: 5.9" (15.0 cm)
    Weight Mount: 25 lb (11.3 kg)
    Packaging Info
    Box Dimensions (LxWxH) 36.5 x 29.2 x 12.0"
  • Electric eFocuser for Photron Ritchey-Chrétien Telescopes
    Motor Stepper with synchronous belt
    Power Via mount
    Dimensions 3.2 x 2.2 x 2.1" / 8.2 x 5.6 x 5.4 cm
    Weight 19.2 oz / 544.3 g
    Packaging Info
    Box Dimensions (LxWxH) 4.0 x 4.0 x 4.0"
  • 52° 25mm Plossl Eyepiece (1.25")
    Focal Length 25mm
    Barrel Diameter 1.25"
    Eye Relief Not specified by manufacturer
    Apparent Field of View 52°
    Dimensions Not specified by manufacturer
    Weight Not specified by manufacturer

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