Stock photos provided by the manufacturers may not represent the actual item. Please verify this picture accurately reflects the product described by the title and description before you place your order.

iOptron Photron 200mm f/8 Ritchey-Chretien Catadioptric Telescope (OTA Only)


Price: $999.00


  • Manufacturer: iOptron
  • MPN: 6112
  • SKU: 6112
  • Availability: 10+ In Stock - Ships from warehouse in 1-2 weeks

<div class="ov-wrapper js-overview-desc" style="color: #595959; font-size: 12px; font-family: OpenSans, Arial, sans-serif;"> <div class="ov-desc" style="color: #464646; font-size: 16px; font-family: inherit;"> <p class="ov-desc-paragraph" style="font-size: 18px; font-family: inherit;"><span style="font-size: 10pt;">&nbsp;</span></p> <p style="font-size: 18px; font-family: inherit;"><span style="font-size: 10pt;">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&nbsp;<span style="font-family: inherit;">iOptron Photron 200mm f/8 Ritchey-Chretien Catadioptric Telescope</span>&nbsp;represents the medium-aperture in the series and is ideally suited for both star-gazing and astrophotography. Despite its larger mirror and long focal length, it delivers views that are free from off-axis comas, or 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.</span></p> <p><span style="font-size: 10pt;">&nbsp;</span></p> <p style="font-family: inherit;"><span style="font-size: 10pt;">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 &mdash; 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.</span></p> <p style="font-family: inherit;"><span style="font-size: 10pt;">Intended for those who have a reliable support system, iOptron offers the RCT here as an 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 piggy-back imaging or DSLR cameras for wide-field photography, a smaller Vixen-style dovetail plate is also pre-installed on the top of the OTA.</span></p> </div> </div> <div class="sectionHeaders js-hiddenFeatures" style="color: #595959; font-size: 12px; font-family: OpenSans, Arial, sans-serif;" data-selenium="sectionHeaders"><dl class="js-featureSectionDL" data-tickertarget="ov-ft-2"><dt class="featureTitle" style="color: #769e2d; font-size: 28px; font-family: inherit;"><span style="font-size: 10pt;">Optical Tube Assembly</span></dt><dd class="c28" style="color: #464646; font-size: 16px; font-family: inherit;"> <ul> <li><span style="font-size: 10pt;">Large 200mm (7.9") clear aperture provides performance while keeping the OTA portable; 95mm secondary mirror</span></li> <li><span style="font-size: 10pt;">Long 1624mm focal length provides a moderate magnification potential and focal ratio for astrophotography</span></li> <li><span style="font-size: 10pt;">Moderate f/8 focal ratio allows for shorter exposure times for imaging than slower OTAs</span></li> <li><span style="font-size: 10pt;">Ritchey-Chr&eacute;tien catadioptric design delivers views free from off-axis comas, or spherical and chromatic aberrations</span></li> <li><span style="font-size: 10pt;">Low thermal-expansion quartz primary and secondary mirrors limit distortion as the mirrors heat</span></li> <li><span style="font-size: 10pt;">Highly reflective dielectric mirror coatings transmit more than 99% of incoming light to ensure bright and clear images</span></li> <li><span style="font-size: 10pt;">Ten internal knife-edge baffles diminish stray light, improving contrast for visual and imaging applications</span></li> <li><span style="font-size: 10pt;">Fixed-position primary mirror eliminates image-shift common in other catadioptric designs</span></li> <li><span style="font-size: 10pt;">Resolution: 0.58 arcsec</span></li> <li><span style="font-size: 10pt;">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</span></li> <li><span style="font-size: 10pt;">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</span></li> <li><span style="font-size: 10pt;">Factory-installed mounting plate for user-supplied finder</span></li> </ul> </dd></dl><dl class="js-featureSectionDL" data-tickertarget="ov-ft-3"><dt class="featureTitle" style="color: #769e2d; font-size: 28px; font-family: inherit;"><span style="font-size: 10pt;">Mounting</span></dt><dd class="c28" style="color: #464646; font-size: 16px; font-family: inherit;"> <ul> <li><span style="font-size: 10pt;">Optical tube assembly only - mount and tripod required for proper use</span></li> <li><span style="font-size: 10pt;">Long Losmandy-style dovetail plate is compatible with the most popular size saddles on alt-az, equatorial, and GoTo mounts</span></li> <li><span style="font-size: 10pt;">Weight: 18 pounds</span></li> <li><span style="font-size: 10pt;">Secondary upper Vixen-style dovetail plate enables easy mounting of smaller guide-scopes or to piggy-back imaging or DSLR cameras for wide-field astrophotography</span></li> </ul> </dd></dl><dl class="js-featureSectionDL" data-tickertarget="ov-ft-4"><dt class="featureTitle" style="color: #769e2d; font-size: 28px; font-family: inherit;"><span style="font-size: 10pt;">Included Accessories</span></dt><dd class="c28" style="color: #464646; font-size: 16px; font-family: inherit;"><span style="font-size: 10pt; font-family: inherit;">Reducer Adapter:</span> <ul> <li><span style="font-size: 10pt;">2"-to-1.25" reducer allows the use of the smaller, more common-sized accessories and eyepieces in the larger focuser drawtube</span></li> </ul> <span style="font-size: 10pt; font-family: inherit;">Extension Rings:</span> <ul> <li><span style="font-size: 10pt;">Three focuser rings allow for increased back-focus distance to ensure the focal plane properly lands on imaging sensors or specialized visual equipment</span></li> <li><span style="font-size: 10pt;">Rings can be used one at a time, or stacked as needed</span></li> <li><span style="font-size: 10pt;">Simple screw-together design requires no tools or permanent modification</span></li> <li><span style="font-size: 10pt;">Includes two (2) 1" tubes and one (1) 2" tube</span></li> </ul> </dd></dl></div>



Customers Reviews

Share your opinion with other customers

Write a review

>