My first efforts, however, were unsuccessful. Stood in front of microwave with the door open. Planetary observations: what to expect from the Powerseeker 50AZ? It's always a good idea to let the scope "breathe" outside for an hour before you even begin to observe. My daughter has a Celestron telescope, and I recently was visiting BHphoto, so bought a Celestron t-ring and a Celestron t-adaptor, so I could try some astrophotography. There's nothing you can do about this, but the good news is - this problem is not very common nowadays; optics quality, while not always great, tends to be at least passable in many cases. (EDIT: yes, there is - page 20) A miscollimated scope indeed behaves as you described - seems "sharp" at low-ish magnification, but quickly becomes blurry if you push magnification up. Look through the eyepiece by placing your eye just behind it, not right against the lens. It seemed to get the closest when I went all the way in, but it never got focused - not even close! Never turn the knob beyond the point where resistance is encountered, or you may damage the focusing mechanism. Being low contrast, your eye will not perceive a lot of detail anyway, so for these objects seeing doesn't matter. MathJax reference. DSLR won't focus in telescope? It works great, but whenever I try to look at a planet such as Jupiter through a 3x barlow lens and either a 20mm eyepiece or a 4mm eyepiece, I get a massive, unfocused image. In general, only one end of the eyepiece gets smeared quickly - the one facing the eye. Weekly Covid-19 Summary. Astronomy Stack Exchange is a question and answer site for astronomers and astrophysicists. You should probably get a 15mm eyepiece as well. While focusing the scope is largely intuitive, it may come out of the box out of focus. But seeing changes with the seasons, or day to day, hour to hour, or indeed from one second to another. The original scope's construction m… Use the lowest power eyepiece (25mm). No more refocusing guesswork! I cannot get it to focus using the focusing knobs, either fully focused in or focused out. A telescope’s primary job is to gather light and squeeze that light down into a small beam that it directs into your eye. I didn't even know collimation existed. Our public announcements are aimed to help to flatten the epidemic curve by being one step ahead of the news. But even allowing for that, people often have real trouble spotting what are meant to be easy-to-find objects. In Jupiter I can never see the spot. With your telescope, focus on a star that’s very bright, such as Sirius. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. It fell halfway over, denting my metal garbage can lid. How long can a floppy disk spin for before wearing out? Venus will show a phase like the Moon, Jupiter will have several tiny pinpoint moons alongside. It also helps with regular observations - I use it almost every time I observe, it makes focusing so much easier. METHODOLOGY. Also, it's important that the scope is in perfect collimation. €179/month. It looks super-sharp and high-contrast at 136x but it's kind of small. I could not see any detail. We now send out our weekly Covid-19 … Jupiter's Great Red Spot is harder to see nowadays. I've been having trouble getting really sharp focus on my telescope. Meade Instruments: A world leader in the manufacturing of Telescopes, Solar Telescopes, Microscopes, Optics, Binoculars, for amateur astronomers and hobbyists Search results for: 'Etx125 won't focus' Telescopes, Solar Telescopes, Binoculars, Spotting Scopes Close double stars that your telescope ought to resolve look single. So I just got a new telescope and mount and decided to take it out tonight, but for the life of me I cannot get it to focus in on anything. For example, the aluminum tube of my Celestron 6" Newtonian (f=750mm) expands by 35 um (the depth of prime focus of my f/5 telescope) for every 2.3C degrees of the increase of the temperature, and by 7.5 um (one microstep of my focuser) for every 0.5C degrees. Can you help? Thomas. If you mount it like that it won't work. We don’t charge per users, sources, or amount of data, just by the number of dashboards you need! My Camera Won't Come to Focus - What to do? Pour autoriser Verizon Media et nos partenaires à traiter vos données personnelles, sélectionnez 'J'accepte' ou 'Gérer les paramètres' pour obtenir plus d’informations et pour gérer vos choix. €179/month. I don't want to just open it up without knowing what I'm looking for. The mask could be made from a piece of cardboard and a sharp knife in like 20 minutes. It is caused by the atmosphere, and in this case, it is hard to focus so focusing aid will help you with that. Close double stars that your telescope ought to resolve look single. Sky-Watcher 10" Dobsonian Telescope focus problem - posted in Reflectors: I bought a brand Sky-Watcher 10 Dobsonian Telescope less than 30 days ago. With my camera set up and connected to my laptop trying to focus by hand can be very frustrating and with this motor drive in the slow mode it does just what I needed it to do. The technique is also different for different types of telescopes (newtonian, cass, etc). What can we expect to see with a telescope with a 70mm aperture and a 10mm eyepiece? rev 2021.2.15.38579, The best answers are voted up and rise to the top, Astronomy Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. You focal length should, at least, be 20 mm. Windows (especially double paned) typically do not permit clean images for a telescope to bring to focus. Orion Telescopes stocks several telescope focusers designed with precision and durability in mind. High quality optics produce a scope that is very "snappy" when achieving perfect focus, and make very sharp images when seeing is good. Your telescope might not be collimated. What is the name of this Nintendo Switch accessory? However it was not possible to focus on it. The telescope should work OK on the moon and planets with the 20mm lens however Saturn and jupiter won't be very big unless you use the barlow to give you about 70 magnification. Quality could be evaluated either on the test bench (which requires equipment), or via direct observation of stars (which requires a very experienced observer and takes time). Always start with the lowest power eyepiece (the one with the highest number in millimeters printed on it). I won’t count this as your mistake, because there’s no telescope in the world that will show these deep-sky objects the way they appear in photographs. My theory is that the focal plane of most DSLR are 55mm back focus plane. Vous pouvez modifier vos choix à tout moment dans vos paramètres de vie privée. Saying that embodies "When you find one mistake, the second is not far". Miscollimation is quite likely the #1 performance killer of all amateur telescopes. Request Individual Plan. When I’m at home, I control my EAGLE powered telescope that I install in my backyard and I’m in my living room. I can never see the Cassini division, and Saturn looks equally soft in the center and on the edges, there's never any surface detail at all. The compact, lightweight form of the M3 make it a light load for the telescope drive and the APS-C sensor effectively boosts my focal length. 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, Opt-in alpha test for a new Stacks editor, Visual design changes to the review queues. You want to see a diffraction pattern of concentric circles appear around it. The simplest way is to use a T-adapter. I can see light and blur now....what should I do?? Many modern telescopes have an eyepiece holder with an external thread which is the same as that adopted by Tamron many years ago when designing lenses to fit a wide variety of cameras. When I move searching for the best clear sky, the telescope is in the field and I stay in my warm car and control it as if I would be there! These telescopes have an open tube, and they need some time to correct the temperature of the tube and the … Yahoo fait partie de Verizon Media. 28 0. Annually: €298 (save €630/yr) 3 brand dashboards. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Also, it is hard to focus on a tree on one specific point. Finally, have you compared views with another instrument of similar aperture? If yes, then you're probably in okay shape (collimation and seeing), you're just not used to the softness at higher magnification. It's most apparent with my wide field eyepiece. Mars will be peach coloured, but only slightly larger than a pinpoint. I'm not using both the adapters only the one that will fit with the 25mm and 10 mm lens' that come with the product. Planets appear fuzzy at high magnification and and won't quite focus. Using Saturn as a reference, with a 20mm eye piece it is very sharp. It's been shrinking and fading for decades now. You simply adjust the focus. Does Saturn look equally soft in the center of the image, as well as near the edge? How can I tell whether a DOS-looking exe. Your NexStar SE has a focusing knob on the back of the tube assembly. Read more about how to flatten the curve here! You want to see a diffraction pattern of concentric circles appear around it. $139.99 { width: 160, height: 160, defaultImage: '', layers: '13031' } Orion Basic 1.25" Rack-and-Pinion Telescope Focuser. Photographing Venus with a phone through a telescope, Trying to use Canon 60D DSLR with Skywatcher 130P. Is it realistic for a town to completely disappear overnight without a major crisis? But it's hard to diagnose things over the Internet. 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. I tried using a Cheshire collimator with no luck even though it showed the telescope was collimated … I used Venus as my point of reference and it's almost like I couldn't zoom out or focus out enough to bring it into focus. Therefore, you must select an appropriate object. Are SSL certs auto-revoked if their Not-Valid-After date is reached without renewing? Maybe seeing is persistently bad (it can happen), or maybe the scope is off-collimation. It will tell you if it's visible at the moment. Meade ETX 125 Telescope Manual Focuser Knob Modification: A replacement for the factory installed focusing knob, which allows precise setup and indication of the focus position for a range of eyepieces, adapters, and photographic equipment. But when I go to 10mm or 6mm, it gets bigger and blurrier. Buy the book Making and Enjoying Telescopes by Miller and Wilson or Build Your Own Telescope by Richard Berry to learn how to build a nice little 4 inch scope like this one. It doesn't need to be a marvel of engineering precision to work well. A: ... (20-30 revolutions for the ETX-60/70AT) before the telescope will focus on objects in the night sky. When seeing is bad, Cassini starts to fade no matter what I do. Usually it looks more like a dent in the equatorial belts, rather than an actual visible spot. The 20mm will have nice sharp edges on the planet and rings, whereas 10mm and 6mm have fuzzy edges on the rings, and the planet itself. M3 Attached to Telescope Prime Focus - Shutter Won't Fire Dec 21, 2015 I'm loving my little Canon EOS M3 camera and had hoped to also be able to use it with my telescope for astrophotography. One thing that is certainly NOT a factor is the central obstruction. A lot of people are not aware of it. Request Professional plan. It gets smaller as I try to focus it (By moving the focus towards the telescope), but still doesn't focus. If the telescope is massively miscollimated, you'll get an improvement immediately. Same amazing features & service with every My Telescope plan . With the 20 mm eyepiece, you get 100x magnification. By "large" I'm refering to telescopes up to 12" aperture (obviously there are larger amateur instruments, which won't be covered here). 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. A telescope dramatically increases the number of observable stars. If you use the plastic caps and you're careful when handling eyepieces, the other end should stay clean a very long time. Features easy installation on many Orion refractor telescopes, and includes an 11:1 fine focus reduction gear for all your visual and astrophotographic needs. Looking for a focuser for your home-built telescope or just want to upgrade for a lower-quality focuser? Then, carefully start defocusing the star. Can anyone else in your area see Cassini these days in a similar aperture, in a scope known to be collimated well? I can't cope with my PhD anymore - No Focus. Do not look through windows. Try to center the star in the field of view. When I use the lenses in the Telescope Adapter Extension, focus is not achievable. If you’re lucky it won’t happen in the middle of a National-level competition. Watch our CEO, Rodrigo Pozo Graviz, being interviewed on Sweden’s biggest news station, TV4. However, when I removed the telescope eyepiece and mounted my dSLR (using LiveView to see if focused), I could … I re-adjust focus each time I change eye pieces, but the best I can get at the stronger magnifications is still very blurry compared to 20mm. Remove … Random solution for capacitated vehcle routing problem (cvrp). Why do air entrainment admixtures improve the freeze-thaw resistance of concrete? I'm having trouble focusing my NexStar SE telescope. Unlike a refractor or reflector, the SE scopes achieve focus by moving the primary mirror forwards and back on a spindle that also serves as a baffle inside the main scope tube. 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. 28 0. Meade ETX 125 Telescope Manual Focuser Knob Modification: A replacement for the factory installed focusing knob, which allows precise setup and indication of the focus position for a range of eyepieces, adapters, and photographic equipment. My bet is that it's either bad collimation, or you haven't compared the view at 200x with another scope, or both. Annually: €298 (save €630/yr) 3 brand dashboards. Is there a collimation procedure you need to follow? It is the one with the highest focal length in millimeters. If you are far-sighted or nearsighted, you don’t need to wear glasses when using a telescope. I tried taking my focuser tube all the way out, and all the way back in. With the 10 mm lens, you get 200x. You can make improvements to your telescope that will make it more useful. As parents, how should we respond to a teenager who argues that the recreational use of pot is socially acceptable, that the authorities aren't concerned about it anymore, and that it's on the verge of being legalized. I have attempted to focus the telescope during the daytime but once again to no avail. To learn more, see our tips on writing great answers. If something is preventing the primary mirror from moving through it full focus travel then you may pick it up with this simple test. My telescope fell and now it won't focus Stargazing; Thread starter danielandpenn; Start date Apr 8, 2009; Apr 8, 2009 #1 danielandpenn. My Telescope predicts Coronavirus risk countries. Reflectors are positioned farther back than where the human eye would normally be placed, and hence it is usually difficult if not impossible to bring the camera into focus. Am I using my Celestron 8 Schmidt-Cassegrain telescope correctly? Try 30 days for free. METHODOLOGY. This is why there is always an optimal magnification for each view - sometimes higher, sometimes lower, depending on many factors. So in general, the bigger the aperture (the diameter of the objective lens or primary mirror) the more useful the scope. €350/month. High quality optics produce a scope that is very "snappy" when achieving perfect focus, and make very sharp images when seeing is good. Focus on it and zoom in as much as you can. Now turn one of the two knobs to the side or below the drawtube, first one way then the other until the terrestrial object is … Thank you for this detailed answer! My theory is that the focal plane of most DSLR are 55mm back focus plane. Even a kid can build such a scope with a little help. This will probably not help in your case, but it's just one way to remove another uncertainty. If not, it might be miscollimated. What is the effect of thrust vectoring effect on the rate of turn? I couldn't get Venus to focus. Constructing a periscope/telescope - trouble with lenses. There isn't enough "back focus" after the eyepiece holder. Last night I was observing for about an hour, which I believe would be enough time for the temperature of the telescope to match the temperature outside. There's nothing you can do about this, but the good news is - this problem is not very common nowadays; optics quality, while not always great, tends to be at least passable in many cases. If you already have one and it’s too late to return it, read on. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. We don’t charge per users, sources, or amount of data, just by the number of dashboards you need! My Telescope predicts Coronavirus risk countries. That’s true up to a point, but if you buy a scope that’s too big and unwieldy, it could become a hobby killer simply because it’s too difficu… Why does the bullet have greater KE than the rifle? To do this, IN DAYLIGHT point the main telescope at an object at least 1/4 mile distant like a chimney or telephone pole. Yes, the obstruction does matter a little, but not to the extent that Internet mythology would have you believe. A: ... (20-30 revolutions for the ETX-60/70AT) before the telescope will focus on objects in the night sky. Not being able to see Cassini is not a good sign. Watch our CEO, Rodrigo Pozo Graviz, being interviewed on Sweden’s biggest news station, TV4. If you own a reflector, it's a good idea to collimate it once in a while, just in case, like changing the oil on a car. Annually: €152 (save €322/yr) 1 brand dashboard. Optics with lots of aberrations cause "mushy" images and a difficulty to find the true focus. To do it, you’ll need a dark sky, a bright star in it, and your telescope! It simply performs like a somewhat smaller instrument, that's all (the physics of the central obstruction are very complex, and would require an entirely different discussion on this forum to fully elucidate). The default position of my primary mirror was not too much in the tube, so I was able to move it with collimation screws good chunk of distance deeper in the telescope. Why are the pronunciations of 'bicycle' and 'recycle' so different? I knew before I bought it that it wasn't made to fit my telescope without a few modifications but after I made the it works great. You adjust the focus near the eyepiece tube, usually by turning a small knob or a dial. Since more light is collected and brought to focus by a larger aperture telescope, fainter objects can be seen with it than with smaller apertures. I'm in a suburban area so I'm sure there is light pollution, could that be a factor? I'm not using both the adapters only the one that will fit with the 25mm and 10 mm lens' that come with the product. Every telescope has collimation knobs at the back of the telescope. Does the word 'afternoon' need a preposition before, in the following context? To reach focus with the telescope also depends on many outside factors like current seeing conditions or type of the telescope. The finderscope came off but I could easily reattach it. If you’re using a telescope on a tracking mount, your focus likely won’t budge when you move to your target. Congratulations for being aware of, and following, the rule that says you need to acclimate the scope to ambient temperature. €350/month. Do not look through windows. Using the … Participal plunder: How should ‘animum concentū’ and ‘ex aequō dēmulcēns’ be interpreted? I can't get it to focus on the moon or Jupiter when I try and it's annoying me. how to refactor this simple but tricky input task? (Reverse these directions for the 4SE.) Weekly Covid-19 Summary. Once you think you are close, clamp both axes of telescope or the pan handle so it won’t move.
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