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Thread: Cheap low power

  1. #11
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    Quote Originally Posted by Johansson View Post
    If no ep can make it get the pleiades in the fov i might by a 10x50 finder instead.
    That is precisely the way I go about viewing the entire Pleiades Cluster as the entire cluster cannot be seen even using my 40mm WA. 10x50s will present you with an excellent view of the Pleiades.

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    Quote Originally Posted by skaven View Post
    Since your scope is an f/10, you can't practically achieve a 2 degree FOV -- you'd need something like a 55mm Plossl in a 1.25" barrel (which nobody makes) or a ~40mm Ethos (100 degree AFOV), which again I don't think anybody makes, especially in a 1.25" format.
    Your right, I couldn't find a 55mm, but I did find a 56mm, which I may try even though it would put my scope below the lowest useful magnification, but I can also use it on my elcheapo refractor

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    I think even with that 56mm lens, the AFOV is going to be fairly narrow due to vignetting introduced by the 1.25" focuser. So I seriously doubt that even with that EP that you'll get a full 2 degree FOV. There's a reason that wide field eyepieces bump to 2" barrels as you get wider and wider -- it's because at some point the field stop becomes the eyepiece barrel itself, and the only way to increase FOV is to make the eyepiece barrel larger.

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    With our Astromaster 114's we can actually get a full 1.9 degree field of view from a mathematical standpoint, but it drops below the lowest useful magnification which means you'll have a big black spot from the central obstruction. But, for refractor users, and others with larger scopes with a smaller percentage of obstruction they could be quite useful. For the price, I plan to get one to test it out, and use it more with future scopes.

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