75mm refractor telescope


<6 skies). 29.00 Found inside – Page 5VWl:lO:lNl owv saaouo a0=i iiii—9z9—ooe-i 3ElH:l 1101 'Five SVS 5822 All On s8I9 TELESCOPES ' COMETRON . LEITZ Zn 8Q-21Qmm f3_8 5i-'95 ... With the 75mm f4 5 siiiii 869.95 a W8lSl Level Finder . . . , .. . CBII M 645 Body H V M can ... Click on the image above to view enlarged close up of the Egret where the violet fringing will be more apparent (132,351 bytes). The installed set shown and circled in green accommodates operation at latitudes of between approximately 25 to 40 degrees, the shorter mechanism shown removed at right is for higher latitudes of Approx. $2,449.00 AUD This refractor telescope is for observing animals during the day or viewing planets with a moon filter at night. The Kellner (designed b Carl Kellner in 1849) is another popular choice, basically an improved Ramsden. The entire lens cell slips onto the optical tube, and is bolted into place by surrounding flat head screws. Since our general policy is to conserve antiques - to clean and protect them from decay, we display this telescope among our collection at our showroom cleaned and assembled but otherwise as it arrived. too. Found inside – Page 165FINER POINTS A telescope's resolving power depends chiefly on its aperture : for example , a 75mm refractor should be able to split stars separated by 1.5 arc seconds , while a 150mm reflector will resolve objects 0.8 arc seconds apart ... 1 Review. Left: Unitron Model 145 - 3 inch Photo-Equatorial Refractor with several options, as illustrated in the 1972 catalog. The RedCat 51 Refractor Telescope comes with 48 mm threads, so it compatible with a variety of wide Canon to Nikon, Sony E to Pentax, or Micro 4/3 T-mounts. Cassini Day/Nite 720mm X 80mm Astro-Terrestrial Refractor Telescope $289.95 (Save . Throughout production changes to the equipment were not arbitrarily made and so parts support remained excellent even beyond the formal demise of the telescopes distribution, for those who choose to restore any Nihon Seiko telescope. AR Coatings: prior to 1935 all refractive lenses were made with no protective or anti-reflection treatments; the bare glass was exposed to the air or cemented to other lens components. 1992 UNITRON Inc., 170 Wilbur Place, PO Box 469, Bohemia, NY 11716 Cassini division can be seen without a problem and also the different hues $199.95. telescopes scaled to Approx. A glimpse of Saturn appearing with modest details no longer had the impact on a person coming of age then that it might have had for people who grew up in the 1950’s or earlier. - you need special adapters to use western standard (non-japanese) This Cat Series refractor also has a camera sensor tilt adjuster to help you get those great images. Above: Unitron 3 inch Photo Equatorial telescope optical tube assembly wood case (76,172 and 90,386 bytes). tracking instead. 1957 UNITRON Instrument Division of United Scientific Co., 204-206 Milk Street, Boston 9, Massachusetts Few other companies of the time could provide before or after sale support like this. advertised for up to 6x4.5 medium format photography. through a TV 76 (before I got my Pentax) and a side by side comparison with But the US companies did not bring back much production to the USA on the whole - they simply looked for countries where things could be made for less than Japan. The De-Luxe version differs from the standard focuser by incorporating manually operated locking clamps so that the user can secure the drawtube at any extended distance; this feature can prevent the weight of an attached payload from inadvertently shifting focus while observing or taking astrophotos. A curious change between the two introductory advertisements and those subsequent ads that followed is that in the first two ads the Model 142 telescope is pointing to the right, while in following ads the same photo is reversed so that the telescope points to the left. We are just trying to keep things in perspective here so that readers do not think they must run out and buy one of these classic dinosaurs without comprehending what they may be getting themselves into. Apochromatic refracting telescopes were taking over the traditional refractor market; these newcomers were being made in larger apertures and with much faster focal ratios too. The EclipseView™ 60mm Telescope comes complete with everything you need to view the wonders of the sky, DAY and NIGHT! Then the customers had a choice of standard accessories including either the 90 degree inclined Star Diagonal (for astronomy uses) or the UNIHEX accessory; this telescope was ordered with the Star Diagonal. The spacer is of the thickness determined by the lens design prescription, but when looking at a lens outside the cell then at first glance it is hard to see any air gap between the lenses. These telescopes, mounts, and accessories were manufactured in Japan and distributed in the Americas from 1951 to about 1992. By 1981 Unitron had been sold to Ehrenreich Photo Optical, a photographic equipment distributor. For example 2.4 inch models are usually referred to as 2.4 inch or occasionally as 60mm in the literature, but at least some of the telescopes of 1954-55 are engraved D 62mm F 900mm, by the mid 1950’s this would be changed and remain D 60mm F 900mm. - no chromatic abberation in focus, visually When the Apollo 17 mission launched on December 7, 1972 this would be the last manned flight to the moon for that century as the originally planned following three missions had been cancelled as funding had been diverted. want spend a fortune on big apo's, this is it - a no compromise telescope Image 8 (right): Comet Machholz, 6 images stacked, Canon 300d, ISO 800, I'm guessing it would be great if you'd like to capture has a bit longer FL, 600mm vs. 500mm for the Pentax). Either focuser can accommodate the then common visual accessories of 0.965 inch or 1.25 inch diameter. This lens employs one element made of BK7 (borosilicate crown) glass precisely matched to work with the SF10 (a high index flint) glass component. - small, great for travelling Found inside – Page 484Wray refractor , and power 52 , the nucleus was about 2in . in dlameter , and , I thought , hour in a particular season for each hour ... those of America , and the fourth those through the middle part of the three bands and telescope . The 0.965 inch standard was referred to as the “Japanese” standard in some literature however, this standard was typical for telescopes made in the late 19th and early 20th centuries and predated Japan’s involvement in optics. We recommend starting out with the lower-power 25mm Plossl, then switching to the 10mm ocular to boost the power of your telescope's view. Celestron AstroMaster 70AZ 70mm f/13 Alt-Az Refractor Telescope. Nihon Seiko sold telescope components to third parties too. Later production telescopes featured slightly improved multilayer antireflection (AR) coatings, usually presenting with a greenish ting. on the planet itself. 50 degrees. is advised. VAT) Out of stock TS-Optics CF-APO 90 mm f/6 FPL55 Triplet APO Refractor with Certificate £1,170 . Image 10: M8 & M20, mosaic of 13 images, Canon 20d, ISO 800, Astronomik The telescope was ordered new in 1975 by the late Mr. Norbert E. Krieg of Saginaw, Michigan. The astronomical telescopes product line offered initially included models built upon the 1.6" (40mm) and 2.4" (62mm) optical tube assemblies. This is the same telescope is the FSQ-85EDX, but includes the 1.01X flattener as part of the standard telescope assembly. I can see the Sun's granulation all over it's surface When the mount head left the Nihon Seiko factory the nominal tensioning of this bolt would have been set. fine), but a 6mm ortho (for which I think is the same as the University Optics A refractor, on the other hand, will remain collimated for years, making it an ideal grab-and-go telescope for those who like to travel to a local dark-sky site, or even further abroad. listed for comparison only Each component was assembled by caring craftsmen who obviously took pride in their work. Even though it could be used at star parties, we would count it as an observatory class instrument that requires a large, permanent mounting solution. So to gain some understanding about the times and how the cost of this telescope compared to other typical expenses of 1952: In 1952 the Model 114 telescope cost the average household nearly two weeks salary! You can use it during the day to observe the wildlife that surrounds you or during the night to observe different stages of the Moon. The De-Luxe focuser of our Model 142 telescope incorporates provisions for locking the focus at any setting; a must for astrophotography, particularly when used with a heavy camera attached. Attach the UNIBALANCE set to the optical tube since this will facilitate changing accessories on the optical tube reducing the need to loosen the optical tube mounting collar to adjust the telescope position on the saddle. Of course Questar was still around, one of the few competitors still there since as far back as 1954, but their unique telescopes appealed to a clientele looking for something different than that which Unitron offered. The G violet color is farthest from focus; this is why contrasting objects observed at high magnification appear with violet halo. Generally speaking the quality of the telescope and mounts was not cheapened over their years of production, though later in production some less obvious cost cutting was apparent to us. While the 1950’s were prosperous years for Unitron, in 1957 astronomy fever erupted with the launch of the Russian satellite Sputnik. 2" and 1.25" eyepieces In terms of mechanical quality, consistency, and comparative comprehensiveness of the system UNITRON was among the better telescope brands sold in the USA. For example 2.4 inch models are usually referred to as 2.4 inch or occasionally as 60mm in the literature, but at least some of the telescopes of 1954-55 are engraved D 62mm F 900mm, by the mid 1950’s this would be changed and remain D 60mm F 900mm. One of these Towa telescopes is a 20 to 90x zoom 60mm achromat on a simple alt-az mount bearing the trade name "UNITRON" on the focuser, and with “UNITRON ED-U-SCOPE™” on the barrel of the telescope optical tube. Click on image to see enlarged view (245,261 bytes). In an effort to compete better in terms of portability by 1980 Nihon Seiko introduced their Models 131-C (3 inch) and 132-C (4 inch) folded refracting telescopes. Vixen in particular suffered greatly as many of their products were copied in appearance if not performance. Quality Optics: 400mm (f/5.7) focal length and 70mm aperture, fully coated optics glass lens with high transmission coatings creates stunning images and protect your eyes. Warranty: 2 Years. The telescopes were not only providing amazing views and images of the night sky, but people were using them for terrestrial uses, and even for decorating a home or office. Unitron did not have much time to enjoy the fruits of the growing market since there were ominous signs on the horizon. Quote. While the even longer 3 inch f/16 equatorial telescopes, as featured here, stand so tall that they will just fit into a typical room. The little Pentax is also great for eclipse photography or a full Sun/Moon MPN: 22451. The Unitron Model 142 in our collection employs the mounting collar. taking The set also includes an auxiliary 2.4 inch x 700mm focal length photo guide telescope, and an auxiliary 10x 42mm Finder; both smaller telescopes are attached in parallel alongside the 3 inch telescope.
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