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Calculating Magnification of Telescope from Eyepiece and Focal Length
Telescope Eyepieces Forum - Calculating Magnification of Telescope from Eyepiece and Focal Length
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12-04-2008, 09:41 PM
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 Calculating Magnification of Telescope from Eyepiece and Focal Length Here I will describe how to calculate the magnification of of your telescope from the eyepiece and and telescope focal Length. To calculate: Magnification = Focal length of the telescope / Focal length of the eyepiece so for example: Magnification = 900 mm / 9 mm Magnification = 100X The telescope with an eyepiece of 9mm would magnify the object (eg moon) you are viewing 100X.
__________________ name: Gus;  main scope: ED 100 PRO refractor, HEQ5-PRO Synscan mount,  Astrophotography gear Canon 450D DSLR       |
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07-02-2009, 10:26 PM
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Hi This is my first go at this forum I have a 8in Dob (skywatcher) wich I am told is good for 400x under good conditions. Do you think I should get a 3mm eye peice And where would I get one in Australia |
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07-03-2009, 02:47 AM
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hey 7715 that would be 333x and you would have to be under extrem good conditions to see really good. on a good nite i up it too 300x on jupiter but like i said u need exteme conditions. but for a good eyeview a 5mm would be ok,, 1000/5 =200x i have a 12.5 in a barlow and i push it to 240x . but with good eps around 150x to 180x you get great views thats for sure..
__________________ SK MAK102EQ2,SKP2001HEQ5,legitech pro4000,dimage g600,canon rebel xs |
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7715gra (07-05-2009) | ||
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07-03-2009, 06:29 AM
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__________________ Rich  Lxd55 5in. 1143mm refractor on a Celestron cg5 goto Lx90 8in.2000mm SCT fork with a wedge and std. field tripod 97d 90mm mak spotter Slik "the professional"tripod Meade series 4000 plossl set , Meade series 5000 plossl set plus others not worth mentioning .... |
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7715gra (07-05-2009) | ||
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08-08-2009, 03:04 PM
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I sometime use the focal lenght of the objective lens or mirror divided by the eyepiece focal lenght in "inches". A 25mm eyepiece is "1" inch. 12.5 is roughly a "1/2 inch. I find I can do this in my head sometimes easier then millimeters. Certainly mm are accurate and I'm in no disagreement. |
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09-24-2009, 10:51 PM
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if i built a telescope with a focal length of 6 m, what focal length should the eyepeice have to give a magnification of 950 times? (hypothetically) |
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09-24-2009, 11:00 PM
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Welcome aubrie  You would need about a 6.5 mm eyepiece. - A 6 meter focal length? Wow.
__________________ Meade 12" LightBridge Dobsonian Pentax PCF WPII Binoculars - 10x50 & 20x60 |
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admin (09-25-2009) | ||
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09-24-2009, 11:06 PM
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Hi Aubrie ...Welcome aboard the forums ...
__________________ Rich Lxd55 5in. 1143mm refractor on a Celestron cg5 goto Lx90 8in.2000mm SCT fork with a wedge and std. field tripod 97d 90mm mak spotter Slik "the professional"tripod Meade series 4000 plossl set , Meade series 5000 plossl set plus others not worth mentioning .... |
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| calculating, eyepiece, focal, length, magnification, telescope |
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