Mauri Rosenthal’s Tele Vue 2.5x Powermate solar images appeared in our Here Comes the Sun! blog last December. Imaging from just 10-miles (16-km) from New York City, it was reasonable to expect that his flickr and Instagram walls featured images of the Sun, Moon, and Planets. To our surprise, we also saw some images of deep-sky objects (DSOs), taken with a Tele Vue-85, from the same light-polluted location. We were intrigued at how he was able to get such reasonable results from his poorly situated location and asked if he’d relate his experiences in this blog.
It turns out we’d found the right guy for the job. Mauri wasn’t a “typical” amateur astronomer/imager: he actually teaches Urban Astrophotography in New York City, under the auspices of the Amateur Astronomers Association of New York. His instructor’s biography, on a recent class registration page, describes Mauri’s motivation as follows:
Surprised by the image quality achievable with small telescopes from his yard in Westchester County, Mauri has been developing deep expertise in Ultraportable Urban Astrophotography and is on a mission to use new technology to extend the access of city-dwellers to the wonders of the night sky.
In this guest blog post, we asked Mauri about his overall experience and how Tele Vue Optics contributes to the enjoyment of his hobby.
The combination of Tele Vue-85 APO refractor and Tele Vue 0.8x Reducer/Flattener (TRF-2008) create a potent, highly portable, flat/wide-field (480mm @ f/5.6) astro-imaging system. The following gallery of Southern Hemisphere nebulae, by Vesselin Petkov, is a great example of the exquisite results possible with the Tele Vue-85.
Imaging was done from his driveway in Queensland Australia in Bortle class 5 (suburban) skies. We’re impressed that the images presented here are composed of color sub-frames without the use of filters or calibration frames.
“Trifid Nebula” (M20 or NGC-6514) was named by John Hershel (1792-1871) who dubbed it the “Trifid” — from Latin for three parts or lobes — based on his telescopic observations of the divisions in the central part of the object. A single giant star in the center of the nebula powers the red glow of hydrogen gas surrounding it. The outer blue zone is starlight reflecting off of dust. The stars around the nebula are an open cluster.
Rodger W. Gordon has been an amateur astronomer since 1952 and has written over 300 articles for various amateur astronomy publications. Having owned hundreds of eyepieces, he has been known as the “Eyepiece King” of the hobby. In his long career, he has worked for Edmund Scientific, Vernonscope, Optical Techniques, and has consulted for Questar.
At the Northeast Astronomy Forum (NEAF) in April 2007, we introduced the 13mm Ethos 100° eyepiece. The overwhelmingly positive response to it at ensuing star-parties led me to explain why the view elicited so many enthusiastic “WOW!” comments in an essay on our website “The Majesty Factor – The Nexus of Contrast, Power, Field” (also on our mobile site). As an example of the enthusiasm, I included the following:
Right after NEAF, Rodger Gordon, a well-known “eyepiece junkie,” wrote me: “Definitely the finest wide-angle eyepiece I’ve ever seen. If God is an astronomer, this is the wide-angle eyepiece he’d choose. You can quote me.” Thanks, Rodger.
Knowing Rodger’s long experience with astronomical equipment, and the fact that we both own Questar 3.5″ telescopes, he sent me the following letter, written July 17, 2020, about comparing his Questar 3.5″ to his son’s Tele Vue-85. I like to call the Tele Vue-85 my “Goldilocks” telescope because it’s just the right aperture and size for everything from a quick “no excuse not to go out” observing session to a full night of enjoyment. However, if I judged telescopes by their sheer beauty and elegance, I guess I would rate my Questar as the “Majesty Factor” winner 😉 .
Getting out in the desert for astrophotography is definitely sheltering in space.
We encountered the above phrase, this week, in the caption of an image of the Christmas Tree Nebula, made with our Tele Vue-85 APO refractor. We felt it apropos for our hobby as it succinctly conjures the connection between amateur astronomy and our current moment in world history.
The image was posted to Flickr by Los Angeles based amateur Bill Allen. So we decided to ask Bill about his journey into astronomy and astrophotography and showcase some of his images in this week’s blog.
We posted some Instagram sketches of the July 2019 Total Solar Eclipse from Chile last month made by Pekka Rautajoki — who traveled all the way from his native Finland to be there. We found a trove of blog-worthy images, he posted on Instagram, made with Tele Vue eyepieces and Tele Vue-85 APO refractor. They encompass a broad range of objects from the northern and southern hemispheres. So, it was only inevitable that we invited him to write a guest blog post based on his exquisite work!
Over the years, we’ve seen conversational topics in online amateur circles that repeatedly crop up concerning the definition of apochromatic refractor, triplet vs. doublet design, and how glass designation might define performance. We expect these questions to continue to appear as new amateurs discover the hobby. So bookmark this blog post because here you’ll find notes on Tele Vue’s philosophy and build practices concerning our telescope line of 100% APO refractors.
This week’s guest blog post is written by Gavin Orpin. The blog came about as a result of a discussion between Gavin and Tele Vue President David Nagler at the recent AstroFest 2019 show held at the Kensington Conference and Events Centre in London.
Coming from the U.K., using night vision for astronomy is very rare due to the cost and difficulty of getting the night vision equipment. I estimate there are only around 6 night vision astro users in the whole of the U.K.. However, I was fortunate in that one of my local astronomy club members is the leading U.K. proponent of night vision astronomy, so I was able to see first-hand this technology in action.
[Night Vision] has given me a completely new aspect of the hobby to explore.
Given the significant light pollution, living near central London does create some big issues for visual astronomy. However, night vision has given me the ability to observe DSOs (Deep Sky Objects) with my Tele Vue-85 APO telescope that I would have no chance with normal glass eyepieces. It has given me a completely new aspect of the hobby to explore — for that I am very grateful to my astro club friend and Tele Vue for making it possible for a U.K. based astronomer. In addition, when I do get the chance to visit a dark site, the night vision works even better and I can see things I never dreamed of when I began observing the stars.
This guest blog post is by Tele Vue-85 owner Chris Owen. Chris is a physician in Orange County California, where he lives with his wife and 3-year old son. You can see more of his images on AstroBin.
I got started in astronomy in the 1990s while I was still in High School. I spent cold clear winter nights in Northern New York learning the basics together with my father on an 8″ Schmidt Cassegrain. I remember trying to manually guide my first prime focus images of M42 with the 2,000mm focal length SCT, shooting 35mm film in 10°F temperatures. The results were predictably flawed and after I went off to college the scope and gear were put away. I went west after finishing school and my astronomy interest faded away under the light polluted sky of Southern California.
At only 30-lunar distances from Earth, Comet 46P/Wirtanen brightened to magnitude 3.6 as it brushed by our planet on December 16th — just 4-days after perihelion (closest to sun). The anticipation of this close pass-by engaged the attention of many amateurs that observed and imaged this “dirty-snowball” in the weeks leading up to the fly-by. But the most iconic image of this comet’s apparition was made two-weeks before its closest approach to Earth.
Imaging a rare celestial event requires advanced planning, the right equipment, and often a lot of post-processing. Tony Cook traveled from the UK to Paphos on the southwest of coast of Cyprus (we suppose for the over 300 sunny days a year) to image the 2004 Transit of Venus with his Tele Vue-85, Coronado SM60 hydrogen alpha filter, Canon 10D camera, and Losmandy GM-8 mount. The 85’s optical capabilities and airline portability often makes it a favorite for amateur astronomers chasing down rare events like this.
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