Posted August 25th, 2010
by admin
Anthony asked: It’s a DS 2090 telescope, a refractor with 90mm of clear aperture and a focal length of 800mm and the remote is missing so you can’t automatically go to a celestial object. Everything else is there. Also I have never sold or bought anything used so please make some suggestions.
Tags: Aperture, Celestial Object, Focal Length
Posted in Astronomy & Space | 5 Comments »
Posted April 18th, 2010
by admin
Brack_871 asked: I have a refractor telescope and I am trying to figure outs it focal length. It is an old Zeiss Telescope and I have no literature on it. Here is what I know:
The diameter of the front lens is approximately 100 mm.
The approximate llength of the telescope from lens to the back is about 4 and 1/2 feet.
Anyone out there able to help me with this?
Tags: Focal Length, Literature, Zeiss
Posted in Astronomy & Space | 1 Comment »
Posted March 21st, 2010
by admin
snail asked: is it possible to build your own telescope? the larger the mirror the more light it gathers what about focal length? some advertise for example 10 inch mirror with f 4.5 what does that mean?
Tags: Build Your Own Telescope, Focal Length, Telescope Mirror
Posted in Astronomy & Space | 3 Comments »
Posted January 4th, 2010
by admin
David C asked: I have a 12″ Dobsonian telescope with a focal length of 1500mm and an f-stop of 5. And what magnitude is Pluto anyway? No jokes about its being ostricized as a planet please.
Tags: Focal Length, Pluto, Power Telescope
Posted in Astronomy & Space | 5 Comments »
Posted July 23rd, 2009
by admin
nymets6159 asked:
Well I really don’t exactly know what telescope I have, I know it’s a Meade telescope, but I don’t know the model. But, anyways, how would I find out the telescope’s focal length? Please I need this to check my eyepiece magnifications.
Tags: Eyepiece, Focal Length, Meade Telescope
Posted in Astronomy & Space | 3 Comments »
Posted May 31st, 2009
by admin
:3 asked:
A telescope with a 20 cm primary mirror has an f# of 5. What would be the focal length of the eyepiece required to give a magnification of 100? I know there’s an equation, but I don’t know what it is. Thanks in advance.
Tags: Eyepiece, Focal Length, Thanks In Advance
Posted in Astronomy & Space | 2 Comments »
Posted May 18th, 2009
by admin
Aquamarine Blue Beauty asked:
Compare the function of the objective lens of a telescope with the objective of a microscope. In each case, do you want a large focal length or small? Why? Where is your object? Where and what kind of image is formed? Compare the function of the eyepiece in both instruments. Do you want a large focal length or small? Why? Where is your ‘object’? Where and what kind of image is formed?
Tags: Focal Length, Microscope, Telescope
Posted in Physics | 1 Comment »
Posted March 29th, 2009
by admin
matters asked:
I have a zhumell perigee 100 Matsukov-Cassgrain. It has an aperture of 4″ and a focal length of 1400mm. I am looking into doing some astrophotography. I have found a Williams adapter eyepiece to fit my nikon coolpix. It has a focal length of 24mm. Is this a good match of eyepiece and telescope?
Tags: Focal Length, Match, Nikon Coolpix
Posted in Astronomy & Space | 3 Comments »
Posted March 18th, 2009
by admin
bigK asked:
so what’s the difference between the objective lens of a microscope and a telescope. for each do you want the object in front or behind each lens. which is a bigger focal length better for, and what kind of image is formed for each?
Tags: Focal Length, Microscope, Objective Lens
Posted in Physics | 1 Comment »
Posted March 12th, 2009
by admin
diente asked:
It is a refracting telescope and has an objective lens of focal length 80 cm, a diameter of 10 cm, and an eyepiece of focal length 5 cm and diameter 1 cm.
Tags: Focal Length, Magnifying Power, Refracting Telescope
Posted in Astronomy & Space | 2 Comments »
