In article <42BA54A5.3A80414B@xxxxxxx>, bbbbbbbb@xxxxxxx says...
>William McHale wrote:
>> The issue wasn't using the same eyepiece; it was the claim that the
>> was dimmer period because of a longer f/ratio.
>A telescope without an eyepiece is worthless.
>I always must use eyepieces in my telescope'. I guess you have the kind
>that doesnt take them or has one glued in? Oh well. Learn something new
As a matter of fact, you *can* use a telescope without eyepiece! To do
this, you must use your own eyes as an "eyepiece": keep your eyes some 15-20
cm away from where the eyepiece normally is (it should be removed when you
do this). Then you'll see the image at prime focus directly. Focus your
eyes on this image -- and you may be surprised at what you can see.
Using this method, I have seen the largest craters on the Moon, and the
Galilean satellites of Jupiter, through a telescope where the eyepiece had
been removed. Depending on the focal length of the scope, you can get some
5-20 x magnification in this way. But you'll get a very narrow field of
Paul Schlyter, Grev Turegatan 40, SE-114 38 Stockholm, SWEDEN
e-mail: pausch at saaf dot se