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TeleGizmos Cover For 16" & 18" Truss Tube Dobsonian Telescopes 115" Circumferenc |  |
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US $69.00 | 17d 3h 18m |
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16 Dobsonian Telescopes
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TeleGizmos Cover For 16" & 18" Truss Tube Dobsonian Telescopes 115" Circumferenc | |
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US $69.00 | 17d 3h 18m |
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From Crisium to Cassini
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NEW Silver 90mm Cassegrain Astronomy Telescope w Tripod | |
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US $184.99 | 16d 6h 10m |
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NEW Silver 90mm Cassegrain Telescope Astronomy w Tripod | |
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US $164.99 | 1d 21h 29m |
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NEW White 90mm Cassegrain Telescope Astronomy w Tripod | |
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US $184.99 | 16d 6h 10m |
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NEW Black 90mm Cassegrain Telescope Astronomy w Tripod | |
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US $184.99 | 16d 6h 10m |
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Cassegrain Telescope Astronomy
What do galaxies look like through a telescope?
Hey watsup everyone...im pretty new to backyard astronomy, but i've been learning alot since I started a few weeks ago. I saw the Orion Nebula for the first time through my telescope to night, and it was pretty sweet!! I am very excited to start looking at galaxies, although I lack the experience and knowlege to properly find/identify them. Here is my first question: When looking at a galaxy at very low magnification (48X), will you see it's shape, or will it be a point of light like all the other stars? Do you have to find the galaxy first and then increase magnification in order to see it's shape? Or will you recognise it right off as a galaxy, even at low magnification? By the way, I am using a 3.5mm Maksutov-Cassegrain telescope. Is this telescope suitible? Thanks in advance.
Don't know if that's got enough resolution to make out a galaxy, but good luck. I was impressed with Jupiter and it's moons over the summer, so a galaxy must be amazing.
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NEW Silver 90mm Cassegrain Astronomy Telescope w Tripod | |
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US $184.99 | 16d 6h 10m |
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NEW Silver 90mm Cassegrain Telescope Astronomy w Tripod | |
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US $164.99 | 1d 21h 29m |
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NEW White 90mm Cassegrain Telescope Astronomy w Tripod | |
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US $184.99 | 16d 6h 10m |
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NEW Black 90mm Cassegrain Telescope Astronomy w Tripod | |
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US $184.99 | 16d 6h 10m |
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Jupiter Rotation from May 16, 2005
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Telescopes Wikipedia
Who was the first to use the telescope for scientific purposes? Galileo? Harriot?
My astronomy professor says that it is a common misconception that Galileo was the first to use telescopes for scientific research. He said that Galileo did not even invent them. And instead, Galileo mostly just made and sold telescopes.
I'm not sure about Thomas Harriot, but him and Galileo were the only two choices left for the exam question above.
All Google searches and Wikipedia articles didn't really specify the answer to this question
Anybody know?
Thanks!
Harriot is the first person known to have sketched the moon from a telescopic view, a few months before Galileo.
It's also well known that Galileo did not invent the telescope.
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Supernova - Safri Duo
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Meade ETX-60 AT 60mm Telescope | |
1 Bid | US $75.00 | 25m |
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CELESTRON 26MM PLOSSL TELESCOPE EYEPIECE 1.25 NEW lens | |
1 Bid | US $29.99 | 1h 42m |
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White 90mm Computerized GPS 'GoTo' Cassegrain Telescope | |
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US $610.49 | 39m |
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Celestron NexStar 114GT 114mm Newtonian Telescope | |
4 Bids | US $127.50 | 2h 39m |
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Celestron NexStar 8 SE 203mm Catadioptric Telescope | |
20 Bids | US $711.00 | 2h 16m |
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Zhumell Bring 'em Near Pirate Spyglass Telescope | |
10 Bids | US $20.52 | 1h 42m |
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Lumicon LF3040 1.25" Olll Telescope Filter | |
7 Bids | US $47.00 | 1h 45m |
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Bushnell Harbormaster 78-3576 76mm Refractor Telescope | |
0 Bid | US $750.00 | 2h 58m |
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Vintage 1960's Tasco Satellite-Scope Beginners Telescope Coated Optics | |
5 Bids | US $42.69 | 2h 37m |
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6MM KELLENER TELESCOPE EYEPIECE .96 LENS | |
0 Bid | US $14.99 | 1h 42m |
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Lumicon International Deep Sky Filter 1.25" Telescope Filter | |
5 Bids | US $43.00 | 1h 38m |
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Celestron Astro-Master 114 Telescope | |
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US $175.00 | 4h 30m |
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Vintage Celestron C5 Sun, Solar Filter- Will Fit 5.75" Telescope | |
7 Bids | US $20.00 | 4h 42m |
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Lumicon 2" Deep Sky Filter Telescope Filter | |
8 Bids | US $81.00 | 2h 10m |
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Meade 8" LX 200 LX200 telescope mint cond. w/extras | |
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US $1,450.00 | 5h 25m |
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Jupiter antique (1955) telescope, 80 power, 40mm | |
0 Bid | US $45.00 | 3h 41m |
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Galileo G-5LTME 130mm Reflector Telescope w/all optics!! | |
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US $127.00 | 5h 33m |
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Professional 350/60mm Monocular Astronomical Telescope White And Black | |
0 Bid | US $74.00 | 3h 31m |
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BRASS TELESCOPE IN A BOX . | |
18 Bids | US $68.02 | 3h 25m |
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New White 6 Telescope w Live Display Digital Camera | |
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US $395.98 | 2h 14m |
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Telescope
How do i properly package a telescope for Ebay?
I threw away the box my telescope came with and i want tips and help on how do i properly package a telescope because i am going to sell and post to customer from ebay.
Yes, BUBBLE WRAP and tape it well. Send it insured. BOX?
Although you didn't specify the dimensions, there are two USPS Priority Mail Boxes that should work:
6" x 38" long"
https://shop.usps.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10001&storeId=10052&productId=10000724&langId=-1&parent_category_rn=10000002&top_category=10000002&categoryId=10000033&top=¤tPage=0&sort=&viewAll=Y&rn=CategoriesDisplay&WT.ac=10000724
6" x 25" long:
https://shop.usps.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10001&storeId=10052&productId=10000725&langId=-1&parent_category_rn=10000002&top_category=10000002&categoryId=10000033&top=¤tPage=0&sort=&viewAll=Y&rn=CategoriesDisplay&WT.ac=10000725
Yes, you will have to order a minimum of 10, but they are FREE and the post office will deliver them to your doorstep FREE. You won't find these boxes at most post offices. Sign up for FREE at the USPS website. It will take about a week for delivery.
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Meade ETX-60 AT 60mm Telescope | |
1 Bid | US $75.00 | 25m |
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CELESTRON 26MM PLOSSL TELESCOPE EYEPIECE 1.25 NEW lens | |
1 Bid | US $29.99 | 1h 41m |
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White 90mm Computerized GPS 'GoTo' Cassegrain Telescope | |
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US $610.49 | 39m |
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Celestron NexStar 114GT 114mm Newtonian Telescope | |
4 Bids | US $127.50 | 2h 39m |
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Celestron NexStar 8 SE 203mm Catadioptric Telescope | |
20 Bids | US $711.00 | 2h 15m |
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Zhumell Bring 'em Near Pirate Spyglass Telescope | |
10 Bids | US $20.52 | 1h 42m |
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Lumicon LF3040 1.25" Olll Telescope Filter | |
7 Bids | US $47.00 | 1h 45m |
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Bushnell Harbormaster 78-3576 76mm Refractor Telescope | |
0 Bid | US $750.00 | 2h 58m |
|
Vintage 1960's Tasco Satellite-Scope Beginners Telescope Coated Optics | |
5 Bids | US $42.69 | 2h 37m |
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6MM KELLENER TELESCOPE EYEPIECE .96 LENS | |
0 Bid | US $14.99 | 1h 41m |
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Lumicon International Deep Sky Filter 1.25" Telescope Filter | |
5 Bids | US $43.00 | 1h 38m |
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Celestron Astro-Master 114 Telescope | |
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US $175.00 | 4h 30m |
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Vintage Celestron C5 Sun, Solar Filter- Will Fit 5.75" Telescope | |
7 Bids | US $20.00 | 4h 42m |
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Lumicon 2" Deep Sky Filter Telescope Filter | |
8 Bids | US $81.00 | 2h 10m |
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Meade 8" LX 200 LX200 telescope mint cond. w/extras | |
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US $1,450.00 | 5h 25m |
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Jupiter antique (1955) telescope, 80 power, 40mm | |
0 Bid | US $45.00 | 3h 41m |
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Galileo G-5LTME 130mm Reflector Telescope w/all optics!! | |
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US $127.00 | 5h 33m |
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Professional 350/60mm Monocular Astronomical Telescope White And Black | |
0 Bid | US $74.00 | 3h 31m |
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BRASS TELESCOPE IN A BOX . | |
18 Bids | US $68.02 | 3h 25m |
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New White 6 Telescope w Live Display Digital Camera | |
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US $395.98 | 2h 14m |
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New White 4.5" Telescope w EQ Mount with Tripod | |
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US $175.99 | 5h 24m |
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Celestron NexStar 102 SLT 102mm Refractor Telescope | |
1 Bid | US $199.00 | 7h 26m |
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Meade ETX-70 70mm Refractor Telescope | |
1 Bid | US $150.00 | 8h 27m |
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Black 6" Automated GPS Reflector Telescope w USB Camera | |
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US $709.49 | 3h 49m |
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CELESTRON 1000MM C90 F/11 TELESCOPE WITH HARD CASE | |
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US $220.00 | 7h 28m |
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Bushnell Voyager Telescope Model 78-9930 with Sky Tour | |
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US $68.50 | 4h 32m |
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Telescope-Meade Altazimuth Refracting Telescope Model 310:80 mm (3.1")Great Gift | |
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US $399.00 | 8h 24m |
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ULTRA HIGH CONTRAST VISUAL BACK FILTER/DUST SEAL - 2 INCH - TELESCOPE FILTER!!! | |
6 Bids | US $47.55 | 6h 47m |
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Emerson 50x100mm Refractor Telescope with Tripod | |
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US $62.55 | 5h 24m |
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BSA Optics 10-30x30mm Terrestrial Pocket Telescope NEW IN BOX | |
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US $39.95 | 6h 22m |
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Vintage Bausch & Lomb 10x Spotting Scope Telescope ∞ Monocular ∞ 'Balscope Ten' | |
2 Bids | US $15.49 | 4h 36m |
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Meade 70AZ-ADR Refracting Telescope 70mm/2.4" w/Tripod, Eyepieces, & Barlow Lens | |
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US $100.00 | 11h 2m |
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Celestron C8 Schmidt Cassegrain Telescope starbright | |
38 Bids | US $390.00 | 9h 26m |
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Orion Sirus 12.5mm plossl telescope eyepiece | |
6 Bids | US $4.25 | 9h 41m |
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Compact 15x32 Monocular Telescope Camping Hiking Travel | |
0 Bid | US $7.55 | 6h 19m |
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Siebert Optics Telescope Eyepieces - in case | |
4 Bids | US $23.56 | 8h 43m |
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Saxon 15-45X52 Packable Spotting Scope Telescope 52mm + 5" Tall Tripod | |
1 Bid | US $34.95 | 9h 1m |
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Military gunsight instrument light graticule M54 NOS Telescope Adjustable | |
0 Bid | US $15.00 | 9h 18m |
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Used Vintage Monocular TELESCOPE MONOLUX 10X30 COATED OPTICS-GOOD CONDITION! | |
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US $59.99 | 6h 7m |
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JMI EZ Align Polar Alignment Scope SCT Telescope version | |
14 Bids | US $61.00 | 9h 55m |
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PlaneWave Instruments at AIC 2009 - Sky & Telescope
What is the minimum size telescope needed to resolve this binary?
An observer is using a telescope to resolve a binary star with a separation of 0.40 arcseconds using a filter which passes light at 5000 A. What is the minimum size telescope needed to resolve the binary?
Steps would be much appreciated.
The Raleigh Criterion for angular resolution is probably the limiting factor here.
sin(theta)=1.22*(wavelength)/(diameter of aperture)
Rerranging:
Diameter=1.22*(wavelength)/(sin(theta))
=1.22*(5000e-10 m)/(sin(1.94e-6 radians))
=.31 meters in diameter
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New Orion SkyQuest XT8 Classic Dobsonian Telescope | |
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US $349.99 | 26d 8h 4m |
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ODYSSEY 8" F/4.5 COULTER OPTICAL DOBSONIAN TELESCOPE | |
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US $325.00 | 1d 8h 27m |
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New Orion SkyQuest XT6 Classic Dobsonian Telescope | |
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US $299.99 | 27d 5h 58m |
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New Orion SkyQuest XT6i IntelliScope Dobsonian Telescope | |
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US $399.99 | 8d 6h 33m |
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New Orion SkyQuest XT4.5 Classic Dobsonian Telescope | |
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US $239.99 | 7d 7h 41m |
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DOBSONIAN TELESCOPE STARGAZER VINYL DECAL/STICKER | |
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US $4.99 | 28d 16h 20m |
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Celestron Compact Dobsonian Telescope + FREE Case & Moon Filter & More Stuff ! ! | |
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US $54.99 | 6d 10h 19m |
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Telescope Tie-Tac --- Dobsonian Reflector - New | |
3 Bids | US $5.50 | 4d 22h 28m |
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CELESTRON FIRSTSCOPE TELESCOPE 76mm 21024 & 2 Eyepieces Dobsonian Reflector | |
1 Bid | US $27.99 | 5d 2h 2m |
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Bushnell ARES DOB 6in. Dobsonian Telescope Base for 786100 | |
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US $59.95 | 25d 5h 55m |
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TELEVUE PARACORR (TYPE 2) FOR DOBSONIAN TELESCOPE (1-1/4" to 2"). NEW IN BOX. | |
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US $520.00 | 25d 9h 7m |
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Meade Light Shroud for the 10" LightBridge Truss-Tube Dobsonian Telescope #07101 | |
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US $38.99 | 21d 11h 53m |
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Meade 12" LightBridge (f/5) Truss-Tube Dobsonian Telescope | |
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US $899.00 | 17d |
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Sky-Watcher 12 Inch Dobsonian Telescope S11740 | |
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US $995.00 | 18d 14h 54m |
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*MEADE* Light Shroud For 10" LightBridge Truss-Tube Dobsonian Telescope. | |
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US $59.80 | 16d 3h 13m |
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*MEADE* Light Shroud For 12" LightBridge Truss-Tube Dobsonian Telescopes. | |
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US $63.48 | 16d 3h 35m |
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TeleGizmos Cover For 6" & 8" F5 Dobsonian Telescopes 62" Circumference, 53" Heig | |
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US $59.00 | 17d 3h 20m |
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TeleGizmos Cover For 16" & 18" Truss Tube Dobsonian Telescopes 115" Circumferenc | |
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US $69.00 | 17d 3h 17m |
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Celestron FirstScope Telescope, 76mm (3") Dobsonian Style Reflector #21024 | |
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US $47.95 | 16d 10h 20m |
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Celestron FirstScope 76mm f/3.95 Dobsonian Reflecting Telescope 21024 | |
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US $44.95 | 10d 9h 19m |
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Dobsonian Telescope
Will the eyepieces from my Newtonian telescope work in an Orion SkyQuest XT8 Classic Dobsonian Telescope?
Sorry if this is a really dumb question 
.....
The eyepiece is 1.25" and 20mm erect. The Newtonian also came with a 1.25" Barlow lens 3x.
All the eyepiece says is Celestron 20mm Erecting Eyepiece. Then the other one is just a Barlow Lens 3x. It also came with a Celestron 4mm piece but I didn't know how to use it ......
An Orion 8" classic should accept 2" and 1.25 eyepieces without any problem.
Wally
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New Orion SkyQuest XT8 Classic Dobsonian Telescope | |
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US $349.99 | 26d 8h 4m |
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ODYSSEY 8" F/4.5 COULTER OPTICAL DOBSONIAN TELESCOPE | |
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US $325.00 | 1d 8h 27m |
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New Orion SkyQuest XT6 Classic Dobsonian Telescope | |
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US $299.99 | 27d 5h 58m |
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New Orion SkyQuest XT6i IntelliScope Dobsonian Telescope | |
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US $399.99 | 8d 6h 33m |
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New Orion SkyQuest XT4.5 Classic Dobsonian Telescope | |
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US $239.99 | 7d 7h 41m |
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DOBSONIAN TELESCOPE STARGAZER VINYL DECAL/STICKER | |
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US $4.99 | 28d 16h 20m |
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Celestron Compact Dobsonian Telescope + FREE Case & Moon Filter & More Stuff ! ! | |
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US $54.99 | 6d 10h 19m |
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Telescope Tie-Tac --- Dobsonian Reflector - New | |
3 Bids | US $5.50 | 4d 22h 28m |
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CELESTRON FIRSTSCOPE TELESCOPE 76mm 21024 & 2 Eyepieces Dobsonian Reflector | |
1 Bid | US $27.99 | 5d 2h 2m |
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Bushnell ARES DOB 6in. Dobsonian Telescope Base for 786100 | |
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US $59.95 | 25d 5h 55m |
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TELEVUE PARACORR (TYPE 2) FOR DOBSONIAN TELESCOPE (1-1/4" to 2"). NEW IN BOX. | |
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US $520.00 | 25d 9h 7m |
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Meade Light Shroud for the 10" LightBridge Truss-Tube Dobsonian Telescope #07101 | |
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US $38.99 | 21d 11h 53m |
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Meade 12" LightBridge (f/5) Truss-Tube Dobsonian Telescope | |
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US $899.00 | 17d |
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Sky-Watcher 12 Inch Dobsonian Telescope S11740 | |
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US $995.00 | 18d 14h 54m |
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*MEADE* Light Shroud For 10" LightBridge Truss-Tube Dobsonian Telescope. | |
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US $59.80 | 16d 3h 13m |
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*MEADE* Light Shroud For 12" LightBridge Truss-Tube Dobsonian Telescopes. | |
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US $63.48 | 16d 3h 35m |
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TeleGizmos Cover For 6" & 8" F5 Dobsonian Telescopes 62" Circumference, 53" Heig | |
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US $59.00 | 17d 3h 20m |
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TeleGizmos Cover For 16" & 18" Truss Tube Dobsonian Telescopes 115" Circumferenc | |
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US $69.00 | 17d 3h 17m |
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Celestron FirstScope Telescope, 76mm (3") Dobsonian Style Reflector #21024 | |
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US $47.95 | 16d 10h 20m |
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Celestron FirstScope 76mm f/3.95 Dobsonian Reflecting Telescope 21024 | |
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US $44.95 | 10d 9h 19m |
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New Orion SkyQuest XT8i IntelliScope Dobsonian Telescope | |
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US $549.99 | 8d 6h 33m |
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New Orion SkyQuest XT10g Computerized GoTo Dobsonian Telescope | |
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US $1,149.99 | 7d 7h 41m |
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Meade Light Shroud for 10" LightBridge Truss-Tube Dobsonian Telescope 07101 | |
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US $42.00 | 6d 5h 26m |
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TeleGizmos Cover For 24" & 25" F/5 Truss Dobsonian Telescopes In Low Park Posit | |
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US $169.00 | 6d 5h 25m |
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TeleGizmos Cover For 18" & 20" F/4.5 Truss Dobsonian Telescopes In Low Park Pos | |
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US $139.00 | 6d 5h 38m |
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New Orion SkyQuest XT8g GoTo Dobsonian Telescope | |
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US $949.99 | 1d 6h 47m |
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Celestron FirstScope Dobsonian Reflector Telescope NEW | |
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US $44.95 | 27d 14h 9m |
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Celestron SkyWatcher 12" Truss-Tube Dobsonian Telescope | |
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US $995.00 | 12d 13h 7m |
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8 Inch Deep Space Hunter Dobsonian Telescope Hardin Optical Co DSH-8 New Sealed | |
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US $500.00 | 7d 10h 35m |
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