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CARL ZEISS JENA REFRACTORS

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"Honesty and openness are sometimes undervalued traits - many would prefer to hide the past, rather than to allow others to freely and publicly record it for all to see. By creating an iKarma Profile, Loron's Astronomy Mall has demonstrated a firm commitment to maintaining a responsible and sincere reputation online. Such people, both rare and precious, are a credit to both business and society. We believe that integrity should be rewarded. The iKarma team is happy to welcome Loron Knowlen's Astronomy Mall to our service." 

CLEAR NIGHTS FORUM

Do you know what FOO FIGHTERS are? Watch the movie to find out.

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THE ARCHENHOLD OBSERVATORY, Berlin Germany

STEP INSIDE AN ONL-LINE OBSERVATORY

LEARN ABOUT THE 3 VANE CURVED SPIDER FOR REFLECTORS by ALBERTO MONTALVO, Burbank, California

WELCOME TO MY MALL

WELCOME TO MY PHOTO ALBUM

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(CLICK HERE)

GET THE LATEST SPACE NEWS (enterprisemission.com)

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CELESTRON C-14 SCT TELESCOPE

Welcome to my on-line "Astronomy Mall". I hope the information contained here at my website will be most helpful to you in your selection of a telescope or other accessory related to astronomy.
 
These items seen here at this on-line mall can be most expensive which is why you should do as much research as you can. I have set up links here that represent long-standing individuals along with well-known firms that have been in business for many years. They are all very fine products. I know because I use some myself. 

TELESCOPES, BINOCULARS, and their related accessories along with STAR CHARTS, BOOKS, and much more...

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JOHNNY CARSON WITH HIS CELESTRON C-14 SCT. HE ALSO HAD A UNITRON REFRACTOR & QUESTAR 3.5

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ARTHUR C. CLARCK WITH HIS CELESTRON C-14 TELESCOPE.

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Leonard Rosenman(September 7, 1924 – March 4, 2008) was an American film, television and concert composer who won two Academy Awards. He also owned a Celestron Compustar C-14 which I saw at his home in the Hollywood Hills. He knew my step-grandfather who was concert master of MGM in the 1940's-50's

LEARN ABOUT TELESCOPES

TESTING THE OPTICS OF YOUR TELESCOPE

You will gain experience in using your telescope especially if you direct your attention to the main points of quality. You will find in time that you will become critical of imperfections of your telescope, casual or inherent. When you test your telescope's optics, you should be careful and pay close attention to your own eyesight and be guided by proper directions and only then will you have a good idea of the quality of your telescope. Remember that no telescope will give the most perfect image. Your telescope is good when you can see fine definition and not to worry about the out of focus star image. If there seems to be a problem with the telescope because of the star image, you can not say what the problem is until you make an examination of the out-of-focus image on a night fine enough to allow you to make a star test at high power, unless the fault is because of a astigmatism, maladjustment, or centering of the optics and on a good night these can be seen at focus.

ON-LINE OBSERVATORY

MT. WILSON OBSERVATORY ASSOCIATION

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UNITRON REFRACTOR

UNITRON REFRACTOR

LORON'S
ASTRONOMY
MALL
OF LOS ANGELES, CALIFORNIA
 
 

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MEADE 8-inch F/10 SCT TELESCOPE SYSTEM

 
WATCH FOR MY VIDEOCAST
SOON TO BE AT
YOU TUBE
On-line Observatory Lectures
Product Demonstrations & Reviews
and lots of other fun stuff too.....
 
 
 

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6" F/12 ASTRO-PHYSICS REFRACTOR

ASTRO-PHYSICS REFRACTOR

I CAN HELP YOU FIND ZEISS!

ZEISS CATALOGS

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UFO NEAR WORLD TRADE CENTER, N.Y., NY. PRE 9/11

EYEPIECES ANYONE?

Well yes we have used them all. At first we would refer you to both Zeiss & Clave but they are very rare. For planetary,lunar, and solar observing we enjoy the Brandons which we use on our 6" refractor at the observatory. However what we like the most is the Lumicon 2" diag., Filters from William optics but the best eyepieces to use on a large aperture Celestron/Mead SCT. are the 2" Meade 40mm SWA, Televue 2" 20mm Nagler, and either the Meade 8.8 SWA or the Televue 2" 9mm Nagler. We also enjoy the classic 26mm Plossl from Celestron. For the Bino-viewer we enjoy the views through the classic Tuthill. Hope the information will help one in the selection of fine accessories for their telescope. Remember however the Brandons are the best! Happy skies everyone.

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TEXAS NAUTICAL REPAIR (Telescopes)

RELEASED IN 1989
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THE 9-INCH F/12 TAKAHASHI SCT SYSTEM

BRANDON EYEPIECES

Brandon is a brand name of VernonScope, and is applied to a variety of products, including a well-established line of eyepieces. Several of the short- to medium focal-length Brandon eyepieces are advertised as orthoscopics, yet they appear upon disassembly to resemble Plossls. They use four lenses in an unsymmetrical duplet formulation designed by Chester Brandon, one of the designers of the top-secret Norden bombsight, which played an important role in World War II.

Brandon eyepieces are a popular choice of professional astronomers worldwide. VernonScope estimates that over one million Brandons in various incarnations and focal lengths have been produced since their introduction in the early 1940s. Designed for medium to high power use with any telescope at focal ratios down to f/4, they are very sharp at the center (although somewhat less so at the edges) and ideally suited to lunar, planetary, star cluster, and binary star observing. They have excellent color correction and very low astigmatism, with very minor field curvature and ghosting. They are fully coated, but not multicoated, in order to reduce a phenomenon known as "narrow angle light scatter" that is sometimes seen in multicoated optics. This scatter shows as a loss of contrast and subtle details within bright objects such as Venus, Mars, and Jupiter. It also shows as a significant difference in the background darkness immediately surrounding a bright object, which is especially important for double-star observing. Brandons are accordingly noted for their exceptional contrast and extremely dark background, two reasons why Questar has been using them in their ultra-premium Maksutov-Cassegrain scopes since 1971. They have moderately wide apparent fields of view, of about 45.

Brandons are threaded for Vernonscope filters only. The use of standard eyepiece color or nebula filters requires adapter 3405. They have rubber eyecups that roll down for eyeglass use, although their eye relief is quite short in the shorter focal lengths. Brandons are the sharpest design currently available in a 1.25" barrel size for eyepiece projection photography


Encyclopedia of Science

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CURVED SPIDER VANE BY ALBERTO MONTALVO

THE TELESCOPE'S F/number

The f/number (focal ratio) of any telescope tells two things about the telescope and that is it's intended purpose and it's photographic performance. The brightness of a star depends on the telescope's aperture not the telescope's f/number. All telescopes of the same aperture at any magnification will show the same visual brightness. There are many that insist their long focal ratio telescope gets higher contrast, this is not correct. A refracting telescope does have more contrast than any other because of it's optical system not because of the f/ratio. You can see that when you are comparing very well made and very well corrected refractors, you will see there is no gain in contrast regardless of the f/ratio of each telescope. Even if a reflecting telescope is well made and has the same size secondary mirror obstruction as another, it will have the same contrast regardless of the f/number of each telescope. All of the confusion and there is much on this issue, is because of the photographic use of the f/number. A faster f/ratio does mean brighter images on film but not in a telescope. Aperture not f/ratio is the important factor with a telescope. Some photographers have a great deal of trouble with this concept. The f/number of any objective lens or a mirror of a telescope has nothing to do with the visual brightness of an image, the bigger the aperture the better.

THE MAONTALVO 12-INCH F/17 DOBSONIAN CONCEPT
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BURBANK OPTICAL COMPANY

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12" F/17 Zeiss Refractor with Series E objective lens.

THE ZEISS B OBJECTIVE LENS
"B" Type Zeiss Objective. The Zeiss B was the first truly successful apochromatic objective along with the Cooke Photo-Visual, I believe. Zeiss did make the apochromatic A objective, but the glass was not stable and tended to accumulate large amounts of fungus. I do not think that there are any useable A Objectives left. The B Objective came in focal lengths between f11, and f15, and I think in the neighborhood of f17.5-19 at their longest. The longer focal lengths were considered to be fully apochromatic (by Abbe's definition), with the f11 being considered a "half" or semi-apochromat by Zeiss. 

GREAT READINGS FROM DANIEL MOUNSEY (CLICK HERE)

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VISIT THE GRIFFITH OBSERVATORY

WHY A 6 INCH F/15 REFRACTOR?

Why a 6-inch F/15 Refractor? From my years of experience as an astronomer who has used a variety of telescopes of different types along with using very rare large apertures of 8-12 inches. I have found the 6 inch F/15 refracting telescope is the optimum design for lunar, planetary, and solar observing. The telescope's size makes it the best instrument in my opinion for advanced observers to use and simple enough for elementary observers to use for their viewing. An observer can master the telescope system with relatively few instructions, and yet the system is large enough to provide optimum viewing in city astmospheric conditions. Furthermore for more advanced observing the 6" F/15 refractor with it's accessories provides opportunities for photographic and spectroscopic work as well. Observatories and educational institutions usually have found the 6-inch F/15 refractor to be the finest instrument for lunar, planetary, and solar observing. For those wanting to build a 6" F/15 refracting telescope system for their observing should obtain a copy of "Telescope Making#44" and read the article entitled "Constructing a Large Brass Refractor" by Larry Myers. Telescope Making was a publication of Kalmbach Publishing Company (Astronomy Magazine)


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PLEASE VISIT THESE MANUFACTURERS, VENDORS, DEALERS, OBSERVATORIES,
CLUBS, and CLASSIFIEDS
 

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HIGH OPTIC (Telescopes & Accessories)

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READ MY BOOK!
Astronomers, Telescope Builders, and Telescope Manufacturers
(c.) LWK 2000
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LOSMANDY MOUNTS (Telescope Mounts)

PARKS OPTICAL (Telescopes & Binoculars)

DAYSTAR FILTERS (Solar Filters)

COMPANY 7 (Telescopes)

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CLASSIC CARL ZEISS JENA

EDWARD R. BYERS (Byers Mount for telescopes)

UNIVERSITY OPTICS (Eyepieces)

SBIG (Digital Photo equipment for telescopes)

JMI TELESCOPES (Telescopes & Accessories)

A. JAGERS OPTICS (Refracting Telescopes)

FUJINON (Binoculars)

QUESTAR (Telescopes)

EBAY CLASSIFIED (TELESCOPES)

SEBEN (Telescopes & Binoculars)

Tele-Vue

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SPACE WEATHER .COM

MEADE INSTRUMENTS (Telescopes & Binoculars)

UNITRON (Refracting Telescopes)

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VERNONSCOPE (Brandon Oculars)

THE GRIFFITH OBSERVATORY, Los Angeles, CA.

THE GEORGE H. LUTZ OBSERVATORY, Moutain Gate, CA.

BRAYEBOOK OBSERVATORY, Cambridge England

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CLASSIC AD FROM EARLY 1990s

ASTRO PHYSICS (Refracting Telescopes)

WILLIAM OPTICS USA (Filters)

CELESTRON INTERNATIONAL (Telescopes & Binoculars)

BAADER PLANETARIUM (Telescopes)

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TELEVUE (Eyepieces)

LEVENSON PRESS (Book on Refracting Telescopes)

SKY & TELESCOPE MAGAZINE

LAVC ASTRONOMY GROUP (Astronomy Club)

TAKAHASHI (Telescopes)

L.A. ASTRONOMICAL SOCIETY (Astronomy Club)

PLACE YOUR INFORMATION, AD OR LINK HERE (FREE)

D&G OPTICAL (Refracting Telescopes)

PLANETARY PHTOGRAPHY

ZEISS HISTORICA SOCIETY

THE ENTERPRISE MISSION (Richard C. Hogland)

COAST TO COAST AM.com (Radio Program)(Former Art Bell Radio Show)

EDMUND SCIENTIFIC (Astroscan)

RMTC (Astronomy Expo)

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THE TAKAHASHI 10-INCH F/12

Welcome to my astronomy mall which is my personal web page. Hope the information contained within this website will be helpful to you in your search for a telescope, observatory, or friends for star parties. The purpose of this mall is to link you up with a good selection of individuals and firms who specialize in the manufacturing and sales of telescopes, binoculars and their related accessories.
 
(POST OFFICE BOX LOCATION)
23679 Calabasas Road #948
Calabasas, California 91302
Telephone: 805-252-4926
Fax: 818-591-1140

"Honesty and openness are sometimes undervalued traits - many would prefer to hide the past, rather than to allow others to freely and publicly record it for all to see. By creating an iKarma Profile, Loron's Astronomy Mall has demonstrated a firm commitment to maintaining a responsible and sincere reputation online. Such people, both rare and precious, are a credit to both business and society. We believe that integrity should be rewarded. The iKarma team is happy to welcome Loron Knowlen's Astronomy Mall to our service." 

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CLICK HERE

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CLICK HERE

DESTINY

ADORAMA

AGENA ASTRO

ASTRO SKY PIERS

ASTROCARDS

ASTROCOM

ASTRO FOX

ASTROMATICS

ASTRO ZAP

DARK SKY, INC.

DOERR

EFSTON SCIENCE STORE

GEKO OPTICAL

GREAT RED SPOT ASTRONOMY PRODUCTS

GS-TELESCOPE

ISLAND EYEPIECE & TELESCOPE

EZ-TESTR-SCHMIDLING

KHAN SCOPE CENTER

KENDRICK ASTRO SYSTEMS

MAUNA KEA SUMMIT ADVENTURES

OCEANSIDE PHOTO CENTER

SCIENCE MALL

SCOPES-4-RENT

SCOPE STUFF

SPACE SHOTS

STELLER OPTICAL

STELLAR-VISION ASTRONOMY SHOP

STERLING RESALE OPTICS