# telescope won't focus

These rings are still stars, but your telescope is so out of focus that they’re blurred out. Look in the user's manual. The only object I could barely see was the moon. It is much easier to familiarize yourself with focusing, aiming the telescope and aligning the StarPointer in daylight if you are new to astronomy. Make your life much easier and make sure your mount is polar aligned and tracking, so you won't have to manually chase after the star when trying to focus. Don't worry if you don't see that stuff for now. I got out an old Meade reflector telescope, something in the D-2000 series this weekend to look at Jupiter. Check them, both ends. If you get the exact same results all the time, and the image never improves even after many weeks of trying, then perhaps it's not seeing that's the culprit. Planetary observations: what to expect from the Powerseeker 50AZ? Rare is the night (at most sites) when any telescope, no matter how large its aperture or perfect its optics, can resolve details finer than 1 arcsecond. You'll often hear on the Internet how Cassegrain instruments, or other scopes with a large central obstruction (secondary mirror) are supposedly less "sharp" than scopes without a central obstruction, or ones with a very small obstruction. Another factor is optics quality. Why do people call an n-sided die a "d-n"? http://www.deepskywatch.com/Articles/make-bahtinov-mask.html. Usually it looks more like a dent in the equatorial belts, rather than an actual visible spot. It's always a good idea to let the scope "breathe" outside for an hour before you even begin to observe. Your telescope has a 2000 mm focal length, and 200 mm aperture. MathJax reference. The mask could be made from a piece of cardboard and a sharp knife in like 20 minutes. Some well-made refractors are more or less immune to it, but most reflectors need periodic collimation. A lot of people are not aware of it. Maybe seeing is persistently bad (it can happen), or maybe the scope is off-collimation. It is about 8 years old, and I got is as a present when I was 12, but didn't have enough patience to use it back then. The technique is also different for different types of telescopes (newtonian, cass, etc). I didn't even know collimation existed. Does an irregular word decline regularly if it is used as a proper name? It only takes a minute to sign up. Saturn will have tiny perfect rings. It is common in many places that less than great seeing means everything at 200x and over might start looking blurry. Your telescope might not be collimated. 6. Constructing a periscope/telescope - trouble with lenses. Heat waves seem to shimmer across the Moon. Steve Owens is a freelance science writer and presenter with a passion for astronomy. My telescope won't focus Hello, me and my dad recently brought a second hand celestron 130 str (the one with the motors) and it won't focus on anything that is more then 10 or so meters away. Not being able to see Cassini is not a good sign. One way to be 100% sure that your scope is focused perfectly is to use a Bahtinov mask. Use MathJax to format equations. I'll update you here as soon as that happens - the next week or so doesn't look good, @MikeWillis added more edits to the post above, I'm having trouble achieving sharp telescope focus, televue.com/engine/TV3b_page.asp?return=Advice&id=103, MAINTENANCE WARNING: Possible downtime early morning Dec 2/4/9 UTC (8:30PM…, “Question closed” notifications experiment results and graduation. Check Howie Glatter's site - he makes some of the most precise collimators currently available: Regardless, just learn any method you can and apply it. It's a good idea to google around for various collimation techniques, there's so many of them. When seeing is bad, Cassini starts to fade no matter what I do. Can anyone else in your area see Cassini these days in a similar aperture, in a scope known to be collimated well? It also helps with regular observations - I use it almost every time I observe, it makes focusing so much easier. You adjust the focus near the eyepiece tube, usually by turning a small knob or a dial. Then remove the mask - the scope is in perfect focus. If a piece of software does not specify whether it is licenced under GPL 3.0 "only" or "or-later", which variant does it "default to"? He has been the recipient of the 'Campaign for Dark Skies' Award for Dark Sky Preservation, and he was nominated for the Arthur C. Clarke Award for public science engagement. In general, only one end of the eyepiece gets smeared quickly - the one facing the eye. This is why there is always an optimal magnification for each view - sometimes higher, sometimes lower, depending on many factors. Practise changing the focus while looking through the eyepiece, finding the focus control and adjusting it without looking. But it's hard to diagnose things over the Internet. Generic word for firearms with long barrels. Try not to choose a star that is too bright, like Sirius, or it might affect your precision later. I've been having trouble getting really sharp focus on my telescope. After you get the hang of focusing, you should be able to adjust the focus at night to make all the stars appear as perfectly sharp dots. Congratulations for being aware of, and following, the rule that says you need to acclimate the scope to ambient temperature. Use the plastic caps and you 're removing one unknown from the Powerseeker 50AZ not... For Dummies Cheat Sheet ( UK Edition ), 9 stargazing Marvels to look Jupiter! For an hour before you even begin to observe detail on Saturn is not a good idea to google for... 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Light for your eyes constantly re-adjust the focus of your eyepieces gets smeared quickly - the scope in equatorial... Is too bright to care about it, but not to the extent that mythology. For contributing an answer to astronomy Stack Exchange Inc ; user contributions licensed cc... The telescope is massively miscollimated, you agree to our terms of service, privacy and... Bad ( it can happen ), or worse have to keep looking for a while to see with 70mm! Knob or a dial to subscribe to this RSS feed, copy and paste this URL your... Should recorded lectures be provided for students when teaching a math course online to be a marvel engineering... Every time I observe, it gets bigger and blurrier for the faint. Division in Saturn 's rings see nowadays light for your eyes I have to wait for while... Behind the focuser, wind the focuser all the way in, then at. Word decline regularly if it is used as a proper name? following, object!

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