This causes what is known in the industry as “chromatic aberration” so when you are looking in a refractor with lenses that do not correct for this you will see fringes of different colors around whatever you are looking at. The inherent problem with lenses is that different colors will focus to different points because of their differing refractive indices. In the early 2000’s the Takahashi company, Japan based, produced a new brand of refractors specially designed for imaging.
The story of the Takahashi FSQ refractors is very interesting. The FSQ is a 4” refractor, employing lenses as opposed to mirrors for the optical elements. I decided to retire that for now and install the FSQ106N, just to change things up for the new year 😊 For the last year I have been using the Takahashi 180mm hyperbolic reflector. So, a telescope with a focal length of 1,000mm and a max magnification of 250x will benefit the best from a 4mm eyepiece.Pier 2, the wide field platform, at Orion’s Belt Remote Observatory currently has two available options for imaging scopes. Depending on observing conditions, eyepiece magnification can perform at less than 35x every inch or up to 75x.Īdditionally, if you’d like to utilize every decimal of possible magnification for your telescope, you can divide the focal length of the telescope by the total magnification. So, if you’re picking up a 127 mm (5 inch) telescope, multiply 5 inches by 50, and you have a maximum magnification of 250x.Īnything beyond this point will most likely appear distorted, fuzzy, and dim. The maximum effectiveness for an eyepiece’s magnification is about 50x for every inch of your telescope’s aperture. There is always a limit to the effectiveness of magnification, depending on the telescope’s aperture. The shorter the eyepiece focal length, the greater the magnification, and vice versa. For instance, if a telescope has a 1000mm focal length, and the eyepiece focal length is 10mm, the total magnification of the eyepiece will be 100x. Eyepieces are a collection of lenses that magnify the light gathered by the lens or mirror at the front, presenting a clear image of whatever object you may be observing.Įyepieces have their own focal length as well, which, when divided by the focal length of a telescope, determines the magnification capabilities. But, for us to view the image clearly, telescopes require an eyepiece. The objective or front-end of a telescope gathers the light and focuses it through the tube.
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