How to Buy a Telescope : Telescope Buying Guide: Focal Ratio & Focal Length

When buying a telescope, use the focal length and focal ratio to determine the magnification of a telescope. Choose a focal ratio for a telescopes based on the tips in this free video on home astronomy from a telescope salesperson.

Expert: Jesse Sturgeon
Bio: Jesse Sturgeon has served as a sales and customer service representative for Anacortes Telescope in Anacortes, Wash. for several years. He enjoys introducing people to the science & art of astronomy.
Filmmaker: Curtis Enlow

Category:

Science & Technology

Tags:

• astronomy
• science
• telescopes
• night sky
• binoculars

[imanoob4]

I want that Tele Vue

[BetaSagittarii]

@Spraycando Woah! I think you misunderstood! He is saying that an eyepiece will give different magnifications depending on the focal length of the telescope. As the first telescope is 540mm focal length, the equation is 540mm/22mm= 24.5x. The second telescope is 1,000mm/22mm=45.5x. In general, under average sky conditions, the average telescope can only achieve about 25x-30x per inch of aperture. So for the second telescope that equals about a max of 120x, beyond that, images will look smeared.

[GeorgeChar95]

@imanoob4 everyone wants it! But you can get less costly Eyepieces of the same quality and high field of view like the Celestron Ultima LX or the Skywatcher Super Wide Angle Panaview with 70 degrees FOV and 28mm Eye Relief pretty high and half the price of the Tele Vue. The only tele vue is really worth buying even with that price is the Ethos 110 FOV which is truely amazing.

[SaturnAndItsRings]

@e3milios wrong

[TheMarknz101]

amazing learn t a lot

[Jsmith858522]

Thank you guys for making this video series!

[Antardrews]

im a beginner and want to buy a telescope. i' ve been watching some telescopes and i liked the ''Orion ShortTube 80-A Refractor Telescope''. what i want is to look the moon and some other planets like jupiter, mars, venus, and saturn.

Would that telescope mach for me, or is there anotherone u could recomend me???

someone answer please

thanks