iOptron Photron 150mm f/9 Ritchey-Chrétien Catadioptric Telescope (OTA Only)

BH #IO6111 • MFR #6111
Key Features
  • 150mm Ritchey-Chrétien Catadioptric OTA
  • 1370mm Focal Length, f/9 Focal Ratio
  • Low Thermal-Expansion Quartz Mirrors
  • Dielectric Mirror Coatings
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 150mm f/9 Ritchey-Chrétien Catadioptric Telescope (RCT) is ideally suited for both stargazing and astrophotography. Its relatively compact size allows it to be used on smaller mounts while delivering views that are free from off-axis comas and spherical and chromatic aberrations. 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.
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iOptron Photron 150mm Overview

  • 1Description
  • 2Optical Tube Assembly
  • 3Mounting
  • 4Included Accessories

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 150mm f/9 Ritchey-Chrétien Catadioptric Telescope (RCT) is ideally suited for both stargazing and astrophotography. Its relatively compact size allows it to be used on smaller mounts while delivering views that are free from off-axis comas and spherical and chromatic aberrations. 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 designessential 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 Vixen-style dovetail plate is factory installed to make it compatible with a wide variety of alt-azimuth, equatorial, and GoTo mounts that can carry a minimum payload of at least 12 pounds.

Optical Tube Assembly
  • 150mm (5.9") clear aperture provides performance while keeping the OTA portable; 67mm secondary mirror
  • 1370mm focal length provides a moderate magnification potential and focal ratio for astrophotography
  • Moderate f/9 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: 0.76 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
  • OTA onlymount and tripod required for proper use
  • Long Vixen-style dovetail plate is compatible with the most popular-sized saddles on alt-az, equatorial, and GoTo mounts
  • Weight: 12 pounds
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: 813578010643

iOptron Photron 150mm Specs

Optical Design
Ritchey-Chretien catadioptric
Aperture
150mm
Focal Length
1370mm
Focal Ratio
f/9.1
Eyepiece Barrel Diameter
2"
Diagonal
None
Finderscope
None
Tripod
None
Mount Type
Vixen-style dovetail plate
Power Source
N/A
Optical Tube Length
19.1" / 48.5 cm
Weight
12.0 lb / 5.4 kg
Packaging Info
Package Weight
17.75 lb
Box Dimensions (LxWxH)
23.7 x 11.6 x 11.1"

iOptron Photron 150mm Reviews

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What is the maximum effective magnification? I am ...

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
Asked by: Ehud
The stated lower magnification could be because of the stated shorter focal length of the OTA.
Answered by: David
Date published: 2021-01-05

1. What is effective magnification? 2. I have a ...

1. What is effective magnification? 2. I have a Celestron SLT5. Can I use its tripod & mount? (I am not going to attach a camera) - and if so, do I need any adapter? Thanks.
Asked by: Ehud
1370mm Focal Length, f/9 Approximate magnification 27.5X Magnification also depends on the millimeter of the eyepiece being used.
Answered by: John
Date published: 2020-12-28

they are making shipments to Mexico?

they are making shipments to Mexico?
Asked by: Anonymous
B&H will ship the iOptron Photron 150mm f/9 Ritchey-Chrétien Catadioptric Telescope (OTA Only) BH #IO6111 • MFR #6111 to Mexico via DHL
Answered by: John
Date published: 2022-02-06

Thanks for the detailed answers so far. I ...

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?
Asked by: Ehud
You will have about a 17 to 22% increase in brightness. The brighter the scope the more objects can be seen and identified.
Answered by: John
Date published: 2021-01-06

Can I take parts and reduce weight to 11 pounds ...

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?
Asked by: Bruno
This would not be possible to do, as there really are no parts to remove.
Answered by: Alex S
Date published: 2020-12-17

I own the Celestron Nexstar 4SE and wondering if ...

I own the Celestron Nexstar 4SE and wondering if I can use my tripod with this OTA?
Asked by: cliff
Probley not. Your tripod head would have to be able to accept Long Vixen-style dovetail plate.
Answered by: John
Date published: 2023-04-18

What is the maximum effective magnification? on ...

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?
Asked by: Ehud
The magnification is approximately 27X without an eyepiece. That now changes when you add the magnification of the eyepiece into the equation.
Answered by: John
Date published: 2020-12-29

What type of finder scope and diagonal are ...

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?
Asked by: Ben
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
Answered by: John
Date published: 2021-01-07
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