1. Page 1 of 2 - Recommendations for 6 inch visual apo refractor - posted in Refractors : I am considering several 6 inch Apochromatic refractors

2. Refractor Telescopes & Apochromatic Refractor Telescopes

3. LX85 Series - 115mm Apochromatic Refractor

4. Orion EON 130mm ED Triplet Apochromatic Refractor

5. The Takahashi Collimating scope is a 6 x 18mm telescope designed for use on refractor, Ritchey-Chretien and classical Cassegrain telescopes and also used on the Takahashi CN-212, Mewlons and refractors of 820mm or more in focal length.

6. Apochromatic Refractor (APO) 8 Items

7. Lighting manufacturers use borosilicate glass in their refractors.

8. Well, actually not too big if it's a refractor.

9. Sky-Watcher Evostar 72 ED Apochromatic Refractor OTA

10. The best two Apochromatic telescopes currently available for sale are Versa ED Apochromatic Refractor OTA Telescope and Orion Triplet Apochromatic Refractor Telescope

11. An Achromatic lens is a type of glass lens found within refractor based telescope

12. My main scope is an Acuter NatureClose refractor with an 80mm objective

13. Our high-performance Apochromatic Refractor Telescope provides stellar viewing of sidereal objects

14. Starizona Apexed-L 0.65x Reducer/Flattener Introducing Starizona´s 5-Element Apex ED 0.65x Reducer/Flattener for Apo refractors and RC/ACF telecopes This focal reducer was designed for apo refractors used by many astrophotographers

15. Page 1 of 4 - F/15 Achromats - posted in Refractors : My understanding is that there are no longer F/15 Achromats sold because too unwieldy, shorter apochromatic refractors do as well, and there is just no market anymore for the older style

16. The largest refractor in history was completed in 1897, at Yerkes Observatory outside Chicago.

17. Ophthalmological and optical diagnostic, testing and surgical apparatus, machines, instruments and equipment including tonometers, adaptometers, aberrometers, keratomes, refractometers, refractors, auto refractors, topographers, lensmeters, pachymeters, exam chairs, instrument stands, slit lamp microscopes, eye testing chart projectors

18. Equipment for opticians and ophthalmologists including pupilometers, refractors, refractometers, auto refractometers, optometers, keratometers, ophthalmometers, skiascopes and reading scales

19. Takahashi TOA-130NS 5.1" F/7.7 Ortho-Apochromat Triplet Refractor OTA

20. Andrew Luck (Alck) Andrew Luck 2012 Topps Chrome Black Refractor BGS 9.5 Buy Now N/A

21. Achromatic and Apochromatic are terms that describe how much chromatic aberration a refractor telescope or lens suffers from

22. ‘Apolar’ is the Russian way of saying that it’s an apochromat – a refractor that corrects for colour fringing known as chromatic aberration

23. Difference Between Apochromatic and Achromatic Telescopes Achromatic refractors bend light at slightly different angles as it passes through a glass lens

24. An Apochromatic refractor will perform much better in terms of photography than its less expensive achromat counterpart

25. From the Manufacturer Versatile triplet Apochromatic refractor telescope featuring ED (extra-low dispersion) glass for exceptional resolution devoid of aberrations

26. Page 1 of 2 - Apochromatic vs Achromatic? & ED? - posted in Equipment: I have heard of Apo and Achro when referencing refractors

27. I own and use both an Achromatic and an Apochromatic 120mm refractor and when used visually there is a slight difference

28. Meade NG70-SM Altazimuth Refractor A-Series Beginners Telescope is a quality refracting telescope for land or sky viewing

29. This performance of this Takahashi 5.1" ED triplet refractor is too good to let it be called simply an Apochromatic scope

30. With the proliferation of Apochromatic refractors that are available to the amateur astronomer, it is time to define the parameters of a true Apochromatic objective lens

31. This 102 mm (4") Altazimuth Infinity Refractor Telescope by Meade delivers bright images and it is ideal for viewing both land and celestial objects.

32. Page 1 of 3 - Stellarvue Nighthawk 7 Aplanat - posted in Refractors : I just bought a used Stellarvue Nighthawk 7 Aplanat (80mm - f/7) off a fellow CNer

33. Stellarvue Star Dust Blue 80mm NightHawk Aplanat Refractor Telescope SVNHA is the perfect size telescope when you are travleling or on the go

34. Retail and wholesale services in relation to medical and surgical diagnostic and testing apparatus, machines, instruments and equipment, ophthalmological and optical diagnostic, testing and surgical apparatus, machines, instruments and equipment including tonometers, adaptometers, aberrometers, keratomes, refractometers, refractors, auto refractors, topographers, lensmeters, pachymeters, exam chairs, instrument stands, slit lamp microscopes, eye testing chart projectors and parts, fittings and accessories for the aforesaid goods

35. The Takahashi Collimating Scope is designed to easily collimate your Ritchey-Chretien, Mewlon, CN-212, Dall-Kirkham, classical Cassegrain, or refractors with a focal length of at least 1000mm

36. An optional threaded adapter is available for select refractors to allow direct threaded attachment of the Apexed Reducer for eliminating the possibility of tilt introduced by the standard focuser clamp ring

37. The objective lens (consisting of 2 or more pieces of glass) of an Apochromatic refractor is designed to focus light to the same point, and correct chromatic aberration .

38. The range of accessories for TOA-150 refractor is extremely large, for both optical (field flatteners, reducers or multipliers of focal length) or mechanical (extension tubes, photo adapters, etc...) purposes.

39. This feature-laden 115mm Astro-Tech ED triplet Apochromatic refractor offers more aperture for the same price as competitive triplet apos, and is priced hundreds of dollars less than competitive scopes with the same aperture

40. He used a two-lens achromat refractor and a weak solar filter (smoked glass) and reported seeing a bump or bulge of light ("Lomonosov's arc") off the solar disc as Venus began to exit the Sun.

41. Up to 7% cash back  · The visual and imaging benefits of Apochromatic refractor telescopes have helped to make them instruments of choice preferred by many real-time observers and imaging experts alike

42. Up to 5% cash back  · Acuter® 70 mm Digital Spotting Scope with 3.1MP Camera, SAVE BIG ! Truly impressive viewing and photographing power! A 70 mm Refractor Spotting Scope with integrated 3.1 megapixel Digital Imager

43. Borg fluorite Apochromatic refractor 107FL f3.9 with ESATTO 3", 107mm diameter, 417mm focal length (f3.9), 6 elements fluorite apochromat with Canon lens, carbon fiber tube with 3 inches ESATTO focuser, M57 camera rotator, rear thread for camera connection, PLUS support rings.

44. Amalthea the only other Jovian satellite over 200 km in diameter, was discovered in 1892 by EE Barnard, using the 91 cm refractor at the Lick Observatory (this was the last visual discovery of a planetary satellite)

45. Collimation (kol-ă-may -shŏn) The alignment of the optical elements in a telescope.For a simple refractor the only adjustment required is to position the object lens at right angles to the optical axis by adjusting the screws on its supporting cell.

46. The goal of Collimating a refractor is to align the focuser with the objective, either by keeping the objective fixed and aligning the focuser (as I do) or by keeping the focuser fixed and aligning the objective (collimable ones).

47. (By the way, achromat means "without color," while Apochromat means "without color--but, we're serious this time." If someone invents a refractor with color correction superior to that of an Apochromat, we're going to have to come up with a new name.) An Apochromat …

48. Their 52-page "Nikon Astronomical Instruments" catalog lists a weight-driven 8-inch apochromat refractor, a 6-inch achromat, 12 and 36-inch reflectors, coronographs, nebular, airglow, auroral and grating spectrographs, 12-inch Coelostats, solar tower telescopes for museums and all sorts of plate measuring and photometric equipment.

49. Daystar Quark with 150mm Refractor - posted in Solar Observing and Imaging: I have a Daystar Quark Chromosphere filter and have used in many smaller telescope like a 72mm and a 100mm Sky-Watcher and all the time I use a Baader UV-IR Filter that is attached to the front of my diagonal