All OMI and Ostahowski Optics mirrors are tested and certified with laser interferometry to be diffraction limited over the entire face of the mirror. From the data acquired in the zonal Foucault test you can estimate the Peak to Valley wavefront error. Computerized “Go-to scope”, i,e. About our mirror suppliers. Interferometry on the other hand, is an extremely strict statistical analysis that assures the customer has a truly diffraction limited optic over its entire wavefront. With a Ostahowski Optics or OMI mirror you can be assured that the P-V, RMS and Strehl values are accurate because they are determined by interferometry. Inferring the RMS and Strehl from Foucault test data consistently overstates the quality of a mirror. Producing an accurate interferogram is a time consuming and expensive process. The mirror coatings provide up to 94 percent enhanced reflectivity, i.e, you get a significant increase in ability to observe dust lanes even in nebulas, resolves the cores of the prominent globular star clusters and reveal some of the most subtle structures in the galaxy. Then Ion Bombardment Assisted Deposition (IBAD) to produce dense coating layers. Fused quartz is glass consisting of silica in non-crystalline form. Its fast f/5 focal ratio works well for pleasing wide field performance. It comes with additional accessories like collimation cap, telescope focuser, dust caps, and free download of special edition Starry Night astronomy software. Every telescope manufacturer says they use only "the best optics in the entire world". These are the most important values to the customer as they are the best predictor of performance at the eyepiece. RMS and Strehl tell you much more about mirror quality than the simple P-V measurement. The P-V, RMS and Strehl values obtained from the interferometric test provide an accurate representation of the mirror's figure. The eyepiece’s moderate magnification provides a great way to begin exploring interesting objects in the night sky. A reflecting telescope (often called as reflector) is a form of telescope that consumes single or a combination of curved mirrors. These telescopes do not suffer from any kind of chromatic aberration. Meade Instruments 216006 Polaris 130 EQ Reflector Telescope, 5. Each interferogram contains roughly 300 data points from which the RMS and Strehl are calculated. The features that make this telescope worthy to be listen in this list are: The Meade Polaris 130 EQ boasts decent aperture scopes with good equatorial mounts and supplemented by a stainless steel tripod. Secondary mirrors are 1/10 wave or better and coated with super enhanced 96% Brilliant-Diamond. Ostahowski Optics supplies Obsession with 15" to 22" aperture mirrors. Its compact built feature makes it easily portable and provides easy assembly just about anywhere, i,e. As a result, a bad mirror can escape detection using these tests. When you have just started reading astronomy, this telescope will compliment your research in best possible ways. We are not affiliated with GigOptix, Inc, GigPeak, Inc, or any subsidiaries. The literature states and physical tests prove that an optic with a RMS wavefront value of 0.076 or less is diffraction limited. It can be shown that a Strehl ratio of 0.8 corresponds to an RMS wavefront error of 0.075 or approximately 1/14 wave. It is a completely objective, quantitative, and accurate assessment of the quality of the optic under test. is a participant in the Amazon Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to, 1. Like any other reflector telescopes, this product may occasionally require minor collimation adjustments when you desire for peak performance, but the innovaters has made it easy by equipping a secondary and primary mirror with thumbscrew adjustments, i.e, you can now adjust those alignments without using any tool. Orion 8850 2-Inch Refractor Telescope Mirror Diagonal $84. There are certain reasons for why this product is listed among best reflector telescopes: Being a computerized star locating telescope, Celestron – Nexstar 130SLT offers the database of more than 40,000 stars, nebulae, galaxies, and whatnot. The results of this effort are accurate RMS wavefront error and Strehl ratio values. The Ronchi and Foucault tests are excellent evaluation tools during mirror fabrication as they show the general shape of the wavefront as well as localized and high frequency errors. The StarBlust 6 boasts about providing amazing lunar explorations of the Moon, jaw-dropping sights of other planets namely Mars, Jupiter, and Saturn including its stupendous rings. SVBONY SV138 Diagonal Mirror 1.25 inch 45 degree Correct Image Prism Diagonal Mirror Fully Metal for Refractor Astronomy Telescope with Dust Cover 3.9 out of 5 stars 8 $35.99 $ 35 . This form of telescope has its own advantages due to which nearly all large and modern research grade astronomical activities prefer reflectors. These celestial objects appear to migrate across the night sky. Generally, reflectors are cheaper than refractors of the same size. It includes EQ-2 mount and stable tripod as well. There isn't enough data in this representation to accurately calculate an RMS or Strehl value. Its rack-and-pinion focuser provide you with a way to fine tune your views of the night sky very easily. You can rotate its mount to 360degrees and also up and down with smooth motions. In other words, the use of the Strehl ratio is a fundamental description of the amount of intensity reduction due to wavefront errors. The telescope is invented with an impressive 1200mm focal length (f/5.9) XT8 mirror. Plus, it doesn’t go over your budget. Speaking of which, this telescope is optimum for beginners as well. Jim's Mobile, Inc. (JMI Telescopes) is a world renowned manufacturer of astronomical telescopes and aftermarket accessories for the amateur and professional astronomer. The Starry Night Special Edition software can help you plan your observations and understand those observations even when its cloudy in the sky.