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Why is the View Upside-Down?

When.you.look.through.your.Astroscan.at.objects.on.the.
ground,.the.first.thing.you’ll.notice.is.that.they.appear.
upside-down..Basically.all.optical.imaging.systems.form.
a.picture.that’s.inverted..(This.includes.the.human.eye.
–.everything.you.see.is.upside-down.on.the.retina,.but.
the.brain.switches.it.upright!)..Binoculars.and.spotting.
scopes.have.built-in.“erecting.prisms”.so.that.the.image.
seen.is.right-side.up..But.these.additional.optical.parts.
reduce.the.amount.of.light.transmitted,.and.although.the.
light.loss.is.small.and.insignificant.for.daytime.viewing,.at.
night.astronomers.need.to.collect.as.much.light.from.dim.
celestial.objects.as.possible..And.it.matters.little.to.them.
if. these. objects. are. seen. inverted.. (Even. most. Moon.
maps.have.south.at.the.top.rather.than.north.because.
of.this,.including.the.one.appearing.in.the.section.on.the.
Moon.in.this.Guide.)

As.shown.in.the.illustration.below,.you.can.get.the.image.
upright.by.moving.around.to.the.front.of.the.telescope.

Terrestrial Use

A

B

C

A

B

C

A

B

C

and.viewing.with.your.back.to.the.object.you’re.watching,.
taking.care.not.to.stand.in.front.of.the.telescope.itself!.
A.much.better.alternative.is.the.Edmund.In-Optical-Path.
Roof.Prism.Erector.available.for.the.Astroscan.which.is.
really.a.“must”.if.you’re.doing.extensive.daytime.viewing.
(see.the.“Accessories”.section)..Simply.insert.this.device.
into.the.bottom.of.the.focusing.tube.and.the.image.you’ll.
see.will.appear.correct.and.upright..This.device.performs.
best.with.the.15.mm.(30X).Plossl.eyepiece..When.used.
with.the.28.mm.(16X).Plossl.the.very.edges.of.your.field.of.
view.will.be.dark,.but.the.rest.of.the.view.will.be.clear.and.
sharp..(Also,.as.previously.mentioned,.on.bright,.sunny.
days.at.16X.you.may.notice.a.fuzzy.spot.that.seems.to.
move.about.the.eyepiece.field..This.is.the.shadow.of.the.
small.diagonal.mirror,.and.completely.disappears.under.
dim-light.conditions.as.the.pupil.of.your.eye.opens.much.
wider.at.night..This.is.the.case.whether.the.Astroscan.is.
used.with.or.without.the.erector.)

To get the image upright, move around to the front of the telescope and view with your back to
the object you’re watching, taking care not to stand in front of the telescope itself!

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Содержание Astroscan

Страница 1: ...and logged over 25 000 hours of stargazing time with the unaided eye binoculars and telescopes Formerly Curator of the Buhl Planetarium in Pittsburgh and Director of the DuPont Planetarium he served a...

Страница 2: ...you to see and study and contemplate Your new Edmund Scientific Astroscan telescope is your tool for exploring these cosmic wonders your personal window on creation This instrument is the result of o...

Страница 3: ...ocate and identify the following items the telescope itself mounting base attached to telescope dew light shield see photo on page 10 shoulder strap rubber base mat two Plossl eyepieces 28 mm 16X and...

Страница 4: ...cope s care free performance the diagonal mirror assembly Field of View Relative Scale Wide Angle Telescope 3 Conventional Telescope 11 4 Standard Binoculars 7 which directs the light out the side of...

Страница 5: ...of an inch from the specified shape Compare this with a sheet of paper which has a thickness of about 200 waves The Edmund Scientific Astroscan betters this tolerance with optics of 1 8 wave In the ca...

Страница 6: ...rvers typically use their lower powers most of the time reserving higher ones for steady nights and close up views of the Moon planets and tight double stars It s been said that a magnification of 30X...

Страница 7: ...ence and the size and type of telescope Some large backyard scopes may need an hour or more to come to equilibrium on a cold night But for a relatively small aperture instrument like the Astroscan thi...

Страница 8: ...nd that the eyepiece comes much farther out than it does for distant objects The closest focusing distance is set by how far the eyepiece tube can be safely moved without it coming out of the focuser...

Страница 9: ...star etc or part of the sky you want to look at and it will be in the low power 28 mm 16X eyepiece Note that there are three separate thumbscrews on the finder itself two for adjusting the alignment...

Страница 10: ...light Sky and Viewing Conditions Good seeing for stargazing depends on many factors but it s specifically concerned with the state of the atmosphere through which the telescope must look There are two...

Страница 11: ...e eyepiece and to a lesser extent the secondary mirror continuously heat up the longer the telescope is pointed at the Sun For this reason projection should be limited to periods of 5 minutes or less...

Страница 12: ...on the useful limits of magnifying power that appeared earlier in this guide under Optical Specifications Phases of the Moon Figures on the inner circle show the Moon in its orbit those on the outer c...

Страница 13: ...ers you saw during the lunar morning The Moon map on page 12 shows some of the most fascinating lunar features and can be used with your Astroscan to tour our neighboring world at all its phases Don t...

Страница 14: ...n difficult Mercury may look almost as if it s under water with its image shimmering and breaking into little bits if the long low atmospheric viewing path is turbulent But if you get a period of exce...

Страница 15: ...s When it appears in the half illuminated phase which you ll need the 15 mm 30X eyepiece to see it s at its greatest angular distance or elongation from the Sun but is also further from us and looks s...

Страница 16: ...eclipse disappearances and or reappearances of the bright satellites as they enter or leave the planet s huge shadow over a period of just several minutes right before your eyes Another is seeing a sa...

Страница 17: ...on these outer denizens of the solar system just knowing that they re there and you are seeing them with your own eyes with a little help from the Astroscan of course will give you great satisfaction...

Страница 18: ...28 mm 16X low power eyepiece simply scan randomly across the sky Go slowly so you can see the individual stars cross the field of view If you live in the city you may see between a few and a few dozen...

Страница 19: ...times varying from a few years to tens or thousands of years per orbit These stars are gravitationally linked and are called physical doubles As many as half of the stars in the sky may be physical do...

Страница 20: ...discussed above is M 45 on his roster Point your Astroscan toward the Star Clusters and Asterisms Tucked away among the stars of the Milky Way are dozens of aggregations of suns called star clusters...

Страница 21: ...ou scan the Milky Way will seem to have a fuzzy haze around them somewhat like a little cloud Early sky explorers noticed this and called the fuzzy spots nebulae which is Latin for clouds These diffus...

Страница 22: ...rientations the brightest and biggest of them are wonderful sights especially from dark country or mountain skies loose star cluster At 30X you ll see a dark rift splitting the nebula in two thus its...

Страница 23: ...f the Milky Way Sweeping them with an Astroscan is truly an unforgettable experience Starclouds in Cygnus Photo by D Healy Square of Pegasus Andromeda Alpheratz Markab Pegasus Finding the Andromeda Ga...

Страница 24: ...lescope Terrestrial Use A A B A B C and viewing with your back to the object you re watching taking care not to stand in front of the telescope itself A much better alternative is the Edmund In Optica...

Страница 25: ...will come out sniffing nervously and if you move very slowly you ll be able to swing the telescope around and look eye to eye at the local wildlife While you re waiting also look at the insects which...

Страница 26: ...ies section for any type of astroimaging The old rule in film astrophotography was to take lots of pictures at different exposures to hopefully get one that s perfect for the object you re shooting Ho...

Страница 27: ...lar fashion over the eye lens until the solution evaporates repeating if necessary It is very important not to use too much solution as it can run into the eyepiece and get between the lenses When not...

Страница 28: ...deal for field use Scientifics Telescope Tripod 30392 57 Black anodized aluminum tripod with special head that screws directly to Astroscan standard base Adjustable height legs that collapse and fold...

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