|
✅ About 2 inch eyepieces
Are you perhaps currently thinking of buying a telescope?
Then you should also consider one with a 2" focuser, as this could give you a completely new perspective on the night sky.
Or does perhaps your telescope already have a 2" focuser?
So far, we have only discussed 1.25" eyepieces - eyepieces that fit into any telescope. But with somewhat larger telescopes, from apertures of around 150mm, you also find 2" focusers fitted.
But what are the bene-fits of 2" eyepieces?
Firstly, these eyepieces are significantly larger and heavier than their smaller 1.25" relatives. But the key feature is their much larger field stop, which does not limit the light bundle to the same extent as the smaller eyepieces hence allowing a much larger field of view. This means you can even find 2" eyepieces providing a more than a 100° apparent field of view. Observing though such an eyepiece seems limitless; it appears as if there is simply no end to the star-speckled blackness. Only when you move your eye will you eventually reach the edge of the field of view. Another advantage of these eyepieces is their very comfortable viewing, with the huge eye lens ensuring very relaxed observing.
For which objects are 2" eyepieces suitable?
In general, the longer focal length 2" eyepieces are of most interest - for example in the range 20-40mm. At the telescope, this will give you low magnifications and very wide fields of view. This makes these eyepieces especially interesting for deep sky observing. So observing faint galaxies or extended nebulae with 2" eyepieces is a real joy. But there is an additional b enefit: Imagine you want to find a particular galaxy with your telescope. Despite your finderscope, you are not sure if it is actually in the field of view because you simply cannot see the faint galaxy with your naked eye. Luckily, you are now using your 2" wide angle eyepiece, covering perhaps two degrees (that is four full moon diameters!) of the night sky. Thanks to the wide field of view, you can see the galaxy directly in the eyepiece and can now set the galaxy in the centre of its field of view.
Astromania 2" 56mm Super Plossl Telescope Eyepiece
|
