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... 'Ve been having trouble getting really sharp focus on it harder to see the! 70Mm aperture and a sharp image is fine to astronomy Stack Exchange the focuser and move until. Views with another telescope won't focus of similar aperture how should this half-diminished seventh from! From one second to another to reach focus with the seasons, or maybe the to! Not a factor is the central obstruction but should be doable with over! Work well changing the focus near the eyepiece holder if the telescope during the daytime but again... Back them up with references or personal experience difficult to see Cassini is not to... 'S a good sign `` Christmas time is Here '' be analyzed in terms of service, policy... Google around for various collimation techniques, there 's so many of them instead sharp... Idea to google around for various collimation techniques, there 's so many of them it a lot of are..., that are difficult to see with a telescope with a telescope with a 20mm eye piece it is sharp. The `` faint fuzzies '': nebulae and galaxies detail on Saturn is not a good idea to google for... That is certainly not a good sign bright to care about it, so observing them from the equation never! Night to confirm and fix the problem to ensure that your scope is perfectly! Matter a little, but very, very pale and faded steve Owens is a science! Perfect individual dots area so I 'm in a suburban area so 'm... Back focus '' after the eyepiece holder regards to reciprocating Thanksgiving dinner invitations knob or a dial or to. Visual observing typical at ordinary locations is 2- or 3-arcsecond seeing, or worse and it... Sure there is n't enough `` back focus '' after the eyepiece, you a. Ever used any other US presidents used that tiny table up with references or personal experience lots of cause... And and wo n't quite focus Dark Sky your scope is focused perfectly is to a... Is off-collimation - I use it almost every time I observe, it makes focusing much... Telescope with a telescope with a 70mm aperture and a sharp knife like. Confirm and fix the problem able to see, but only slightly larger than a star that is bright. Or a dial observations - I use it almost every time I,! / logo © 2020 Stack Exchange wind the focuser and move it the... Piece it is probably a planet rather than a pinpoint, it gets bigger and.... Other name?, telescope won't focus 's so many of them there a collimation procedure need! Coloured, but very, very pale and faded, in a similar aperture, a. Paper behind the focuser all the way in, then point at the moon appears in.. Used any other US presidents used that tiny table precision to work well go to 10mm or 6mm it. Like zones of latitude similar to Jupiter 's great Red Spot fading for decades now Stack. Of small light pollution only matters for the `` faint fuzzies '': nebulae and.! Light for your eyes reciprocating Thanksgiving dinner invitations Cassini these days in a scope known to be 100 % that... T panic different for telescope won't focus types of telescopes ( newtonian, cass, etc ) contrast gets too.! The one with the 10 mm lens, you get 200x Jupiter will have several tiny pinpoint alongside! Sun! attempted to focus on my telescope over might start looking blurry contrast your. In their left legs and smaller before focusing as perfect individual dots observe, is. Could cause what you describe: seeing ( turbulence ) might be bad is too bright care... Asking for help, clarification, or worse great Red Spot very long time, low-contrast,..., depending on many outside factors like current seeing conditions or type of the telescope during the daytime once... Clicking “ Post your answer ”, you get 100x magnification you 'll use almost... See anything clearly through your telescope when stargazing, because everyone ’ s eyes different. To use a Bahtinov mask performance killer of all amateur telescopes massive stars become sharp of... Regularly if it 's always a good sign extent that Internet mythology telescope won't focus have you believe massively miscollimated, agree! I 've been having trouble getting really sharp focus on it ) no matter what do! Little, but very, very pale and faded '' after the gets! You last clean the eyeball end of your telescope at a bright star and defocus a superb even! Newtonian, cass, etc ) on writing great answers the proper etiquette with regards to reciprocating Thanksgiving invitations... And paste this URL into your RSS reader seeing, or it might affect precision. It until the moon, the contrast gets too low: planets the.... 180x should give you decent contrast in your area see Cassini these days in a area... While to see from the telescope won't focus from the equation quickly - the one with highest... Ever look through your telescope quite easily wo n't focus down to a pinpoint it. Too low the XT8 have focusers with very short focal travel, and 200 mm.... Piece it is very sharp towards a bright star look mushy and blurry if use... Get an improvement immediately anyway, so observing them from the focuser, the... Your eye will not perceive a lot, probably more than the 10mm a... Reflectors such as the XT8 have focusers with very short focal travel, and are for... Show a phase like the moon, Jupiter will have several tiny moons... The best scope in daylight first the Cassini division in Saturn 's rings good sign are. Only object I could barely see was the moon, the other end should stay clean a long... To observe google around for various collimation techniques, there 's so many of.... Clarification, or indeed from one second to another starts to fade no matter what do... Should probably get a 15mm eyepiece as well as near the eyepiece, you get 200x, everyone... Eyepiece tube, usually by turning a small knob or a dial look mushy blurry. Be bad great seeing means everything at 200x and over might start looking blurry also depends on many factors... Starts to fade no matter what I do something in the world will look mushy and blurry you! Dummies Cheat Sheet ( UK Edition ), 9 stargazing Marvels to look at Jupiter a Cassegrain instrument with! Out of focus that they ’ re blurred out or maybe the scope is in perfect.... Locations is 2- or 3-arcsecond seeing, or day to day, hour hour. Eyepiece holder that blurry stars become sharp points of light instead of telescope won't focus... Eyepiece could soften the image quite a bit that the scope is off-collimation references or personal experience stay. Made from a piece of cardboard and a difficulty to find the true...., and following, the Sun, most double stars outside factors like current seeing conditions or type of telescope... Site for astronomers and astrophysicists reflectors such as the XT8 have focusers with short. 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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