Celestron 22026 Royal Observatory FirstScope Manual

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4 | ENGLISH

When you look through an eyepiece, your eye must be a

speciﬁc distance from the top lens of the eyepiece in order

to see the full image circle the eyepiece provides. If you are

too far away, you will only see the center of the view and the

edges are cut off. If you are using an eyepiece with a long

eye relief distance, you may be able to view through the

eyepiece with your glasses on. To test this, look through

the eyepiece with your glasses on, then take them off and

look again. If you can see the same ﬁeld if view with your

glasses on, you can view while wearing them. If you notice

that the view without your glasses on offers a far larger

ﬁeld of view, you should not wear your glasses when using

this eyepiece.

You can always view without your glasses on, but you

will need to adjust the focus knobs to compensate for

your vision. If you are observing with other people, they

may need to readjust the focus when they view through

the telescope.

If you suffer from severe astigmatism, the telescope may

not focus as sharply as when you are wearing your glasses.

If you are considering the purchase of additional eyepieces

for your telescope, you should look at eyepiece designs that

offer at least 18 mm of eye relief to give yourself a better

chance of observing with your glasses on.

VIEWING WITH EYEGLASSES

In order to see the sharpest image possible, you need to

focus the eyepiece. Focus will depend on many factors,

such as distance to your target and the eyepiece you are

using, but can also depend on the person looking through

the telescope.

While looking through the eyepiece, slowly turn the

focusing knobs located below the eyepiece at the base

of the focuser. You should see the image go from blurry

to sharp. If you keep turning the knob and pass the focus

point, the image will become blurry again. Simply turn the

knobs back the other way until you ﬁnd the sharpest image.

What may look focused to you may not be in focus for

someone else. If you are sharing an image of the Moon

or a planet with someone, don’t forget to remind them to

refocus the eyepiece so they can see the sharp details that

you did.

FOCUSING

Focus Knob

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Celestron 22026 Royal Observatory Greenwich FirstScope Table Top Telescope