Guide :Optics : Optisan Telescope and Microscope Set

Unable to focus to clear view with the erecting eyepiece in

This is on the optisan star 70076

Research, Knowledge and Information :


William Optics 45-deg Erecting Prism - Star Diagonals ...


William Optics 45-deg Erecting Prism ... Using a low power eyepiece to locate the view was just ... clear view of Saturn rewarded me with both the 8mm as well as ...
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FAQ5: How to Use a Telescope


How to Use a Telescope. ... If you want to use your telescope to view terrestrial objects during the day ... When your eyepiece is out of focus, ...
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Fixing Common Telescope Problems - fraserf.id.au


Fixing common telescope problems ... then you can get erecting prisms ... This can be very confusing for beginners when they try to match the eyepiece view ...
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Celestron Astromaster 130 EQ Review - blogspot.com


Feb 01, 2011 · One 20 mm erecting eyepiece ... at just 33x with the 20 mm eyepiece. At first view itself ... 3mm and am unable to focus, but the eyepiece appears ...
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How-To Guide: Using A Telescope The Right Way


Number on the Telescope Eyepiece. ... A low magnification eyepiece has a wider field of view ... How To Telescope How To Guides and Articles How To Use A Telescope.
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Customer Service - Meade ETX-90EC Instruction Manual [Page 20]


Erecting Prism or doing photography with either ETX ... object in the field of view of the eyepiece. ... • For clear viewing of objects, turn the focus knob ...
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Amazon.com: Customer reviews: Celestron 31042 AstroMaster 114 ...


Find helpful customer reviews and review ratings for Celestron ... I was able to keep objects in view with the ... I was unable to render a useable photo ...

Celestron Travel Scope 70mm f/5.7 AZ Refractor Telescope Kit


Buy Celestron Travel Scope 70mm f/5.7 AZ ... Integrated erecting prism corrects view ... It is very good for viewing the moon as the details really pop on a clear ...
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Suggested Questions And Answer :


Unable to focus to clear view with the erecting eyepiece in


Hi wesmick, please send me your email address and I will email the manual back to you. kind rgds, Lilie
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Optisan star 70076


Try the other eyepiece first-- no one can fix that scope which is imported. No repair facilities or replacement parts. Next time stay away from those types of scopes-- buy from one of these NORMAL scope retailers--http://www.tasco.com/pages/instruction-manuals/http://www.telescope.com/www.telescopeman.orgwww.telescopeman.infowww.telescopeman.us
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Cannot focus model AP-78-9570 Bushnell Telescope


Is this your telescope?http://www.binocularsdirect.com/Bushnell_Telescopes/dptsmzmyqcq.htmlCan you try replacing the eyepieces on the side with the one on the back. Also if you "slightly" slide the eyepiece OUT does it come to focus?I must tell you this is a very unusual design with a turrent AND another eyepiece on the back. Has the rotary eyepiece module become loose from the back of the tube? Can you push it in closer to the tube?Other than forward or backward adjustment that's all the focuser will do.
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What lens do i insert into scope to view the moon


The moon is big so use the 25mm. The Barlow will have a multiplication marking on it 2x 3x etc. A 2x Barlow lens will effectively double the power of the eyepiece you are using. Do not use the erecting eyepiece for anything other than land viewing. Erecting eyepieces generally reduce the amount of light reaching your eye and thus reduce brightness of the faint objects in the sky.So basically just place the 25 mm lens in the focuser and point the scope at the moon and you will be amazed at what you can see and how bright it is.
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Can't focus my telescope


If there is nothing on the objective lenses or eyepiece lenses then it most likely needs collimation. This is where you adjust the secondary mirror while viewing an out of focus star. You need stable sky conditions to do this.There are most likely three small screws at the front of the telescope and these are what you use to adjust it. As one screw is loosened then another is tightened. Do this in very small increments. If you have your manual it should outline how to perform this. If not go to this web site: http://www.astrosurf.com/legault/collim.html. It will show examples of how objects look both in and out of collimation. There is a section further down the page for SCTs.A very handy tool for this is to replace your screws with Bob's Knobs (http://www.bobsknobs.com/) . These replace the screws and allow you to adjust it by hand instead of a screwdriver.The other focusing problem I've experience with my Celestron SCT is to have the focus knob loosen up and then slip as I turned it so that I could never focus with it.Good luck and clear skies!-jodair
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Lost vision The telescope was working fine until I was trying to match the view through the smaller spotting scope with that of the main telescope, and suddenly I could faintly tell I was aimed at the moon by a soft glow alone, but could no longer actually see details nor the usual brightness of it. I've taken the scope apart and cleaned the lenses and mirror. I can see beautifully if I remove the eyepiece, but of course I'm just looking at the mirrors inside at that point. When I replace the eyepiece, all I can see is that very faint glow which, when focused, gives me that funky view of the inside of my own eyeball like when you get your eyes checked at the optometrist's office and they shine that bright light in your pupil. Any idea what's happened here and how I can fix it? Maybe I need a new eyepiece?


Your telescope is a "Newtonian," as such it requires regular "collimation" Collimation the alignment of the optics. The mirrors must be lined up properly for the telescope to deliver a good image to the eyepiece. Your scope sound like it is way out of collimation. My guess is that the diagonal (secondary) mirror has rotated in it's mount. There are three basic tools for collimating a Newtonian the Sight Tube, Cheshire and Autocollimator. To get your digonal aligned correctly you need a sight tube. Rather than spend a lot on these consider making your own and keep an eye on eBay offerings. Don't bother investing in a laser collimator, they simply don't do the job unless you go for the very best. From some help with the collimation process check these links. http://www.astronexus.com/node/6http://www.amateurastronomy.com/collimate.html The 60 page pamphlet "New Perspectives on Newtonian Collimation," Fourth Edition by Vic Menard and Tippy D’Auria runs $10, but if you really want to do it right it's worth the money. HTH, George
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Focusing Issue Last night, I used my Celestron 11" NexStar11GPS for observing and astrophotography, and it worked like a charm. Tonight, with the same equipment, I am unable to focus the telescope at all. I turned both the coarse and fine focus knobs counterclockwise as far as they will go, but every object is still out of focus--and once I reach a certain point in turning the focus knobs, the object simply moves in the eyepiece rather than becoming more focused. This problem is present with or without the use of a diagonal. The only thing I did with the telescope between last night and tonight was to mount a Celestron StarPointer (a holographic sight-type finderscope) onto the side of the telescope tube's back end with some 8x32 3/8" screws using pre-drilled screw holes. What happened?


The screws should be short enough not to stop the primary's travel, but pull them out and try it again. Good luck! George.
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Science Tech 262 telescope image problems.


TOO much magnification! Hate to tell you but the MAXIMUM magnification for any telescope (all things being perfect-- like optics, and sky conditions) is 50 times aperture. So max for you is about 125 power.Normally only about 30-40 times aperture is possible. So about 90 power is your normal max magnification.We see this every Christmas. People buy scopes that say 275 power or 500 power on the outside of the box. It's a LIE!Even in my 8 inch LX90 I rarely go above 200 power, and only when the sky is clear and very stable. Use the eyepiece with the largest number written on it which will be your lowest magnification.
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