Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_banner_terminator_challenge_winners.thumb.jpg.6becf44442bc7105be59da91b2bee295.jpg

Search the Community

Showing results for tags 'focus'.



More search options

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Content Type


Forums

  • Welcome
    • Welcome
  • Beginners
    • Getting Started General Help and Advice
    • Getting Started Equipment Help and Advice
    • Getting Started With Observing
    • Getting Started With Imaging
  • Community
    • Official SGL Announcements and Events
    • SGL Challenges and Competitions
    • SGL Star Parties
    • Star Parties & Astro Events
    • Celestial Events Heads Up
    • The Astro Lounge
  • Retailers
    • Sponsor Announcements and Offers
    • FLO Clearance Offers
    • Supplier Reviews
  • Astro Classifieds
    • For Sale / Swap
    • Wanted
  • Equipment
  • Observing
  • EEVA (Electronically Enhanced Visual Astronomy)
  • Imaging
  • Science
  • WADAS's WADAS Discussion Forum
  • Beaufort Club's Topics
  • Swindon Stargazers Club's Topics
  • East Midlands Stargazers''s Topics
  • Central Scotland Astro's Topics
  • SGL Cumbrian Skies's Topics
  • Herts, Beds and Bucks Group's Topics
  • SGL East Anglian Group's Topics
  • South Leicester Observers's Topics
  • South Wales Group's Topics
  • SGL Surrey Observers's Topics
  • South Yorkshire Stargazers's Topics
  • Yorkshire Astronomers's Topics
  • Devon and Cornwall's Topics
  • West Midlands's Topics
  • Essex Cloud Dodgers's Topics
  • Essex Cloud Dodgers's New equipment
  • NLO and Planetarium's Topics
  • Astronomical Society of Edinburgh's Discussion
  • Dorset Stargazers's Topics
  • Hairy Stars Club (Comets)'s Tutorials and Guides
  • Hairy Stars Club (Comets)'s General Discussion
  • Hairy Stars Club (Comets)'s Observing Campaigns
  • Hairy Stars Club (Comets)'s Analysis results
  • Hairy Stars Club (Comets)'s Useful Links
  • Pixinsight Users Club's Pixinsight Discussion Forum

Calendars

  • Astro TV
  • Celestial Events
  • SGL Calendar
  • Astro Society Events
  • Star Parties
  • WADAS's Events
  • Beaufort Club's Events
  • Astronomical Society of Edinburgh's Events
  • Dorset Stargazers's Events

Blogs

There are no results to display.

There are no results to display.


Find results in...

Find results that contain...


Date Created

  • Start

    End


Last Updated

  • Start

    End


Filter by number of...

Joined

  • Start

    End


Group


AIM


MSN


Website URL


ICQ


Yahoo


Jabber


Skype


Interests


Location

Found 25 results

  1. I acquired a second hand Coronado PST. The focus knob doesn't seem to have any effect on the image and, although it turns, it feels as if something inside the scope is "slipping". Is it worth opening up and taking a look to see the focus knob in action? Is there anywhere that services the PST without sending it outside the UK? Are there any nasty surprises if I open it up (springs, pressure points etc)?
  2. Hi all, Absolute newby here - my first foray into astronomy. I bought a Saxon 1400mm 6" refractor secondhand complete with a EQ mount for a bargain price and I'm keen to get it working properly for both planetary and deep space observations. I invested in a few extras such as a laser collimator and a 3x barlow. I think I have a handle on how it all works including the EQ mount. I took the scope out for a test over Easter - which just happened to coincide with a ISS transit of the full moon. Rippa, I thought, that would be great to capture on my first night of observations. The problem I have is the complete inability to focus the scope to anything like sharp enough. I have some photos I took with the scope attached: The scene with the normal camera lens for my daylight practice session A shot of a distant house with the telescope (using a Nikon D7000 on a t-mount adaptor) The same house with the barlow attached A shot of the moon- no barlow - as sharp as I could get it - certainly no way to see the silhouette of the ISS with the scope this out of focus When I was collumating the scope, I noticed a that the reflection on the primary mirror was not a single spot but rather a line ... which means that the laser on the collimator target is a line rather than a dot I confirmed that this is not a problem with the shape of the laser beam coming from the collimator by showing the shape on my hand at a distance of 14m I'm not sure if the distortion of the laser is the fault of the secondary mirror or the lens(es) in the bottom of the eyepiece mount. I'm also not sure if this distortion is what is causing the inability to focus the scope, but I suspect that both issues are symptoms of the same problem. I'd appreciate any ideas on what to do next to resolve the focus issue.
  3. So my birthday just past so money to splash on astro stuff , i will have my 1000D modded by juan at cheapastrophotography and also have ordered an autofocuser from deepsky dad https://deepskydad.com/autofocuser i know they can be done DIY but this is a neat package and costs about the same as a SW autofocuser and a hitechastro focusmaster and i`m no electronic wizard and pavel seems to have a good product and works with ascom and confirmed it works with APT i will update in a few weeks time when hopefully i will have received and tried out .
  4. I've had my telescope (the Galileo G-872 refractor) for several years now and have been able to view planets in quite a bit of detail such as the rings on Saturn and the red spot on Jupiter. But recently every time I have tried to focus in on any planets (I've tried Mars, Jupiter, and Saturn) all I get are big grey dots. I am still able to focus on the moon with great detail but the planets still remain to be big grey dots. I have tried several times over the past few weeks in all different conditions and locations, I've cleaned the lenses, I've tried all of my different lenses and attachments and nothing works! I would really appreciate some help from someone who is maybe a bit more experienced in these matters than I.
  5. I came across a video on youtube of a flymesh bahtinov , not focal length dependant has anyone ever tried this method before ? mesh he used is approx 1.5 mm sq and one half of the mesh is at 45deg to the other half ,found after i purchased a mask for my mak but still need one for my 130pds . https://youtu.be/IeUs7pFwMJw
  6. I'm brand new to this site, but I'm having an issue with my Celestron Powerseeker 127eq telescope. It's brand new right out of the box today. I have another telescope, Zhummel Z10, but the celestron just won't focus. It gets so close to focusing and just needs a little more. Any my help is appreciated thank!
  7. Hello, Am very new to this so apologies right from the start. I have recently just bought a skywatcher akyliner dobsonian 200p and i set it up. However the image is very blurry even when i remove all magnification and just look into the primary mirror eveything looks very blurry including the moon or nearby trees etc. I am unsure what the issue could be as i am eager to get started on my stargazing! Could someone please assist me or at the very least point me in the right direction. Kind regards
  8. Hi All, I'm very very new to this - so be gentle with me! I've inherited a Helios 150 telescope which I'm learning how to work. I observed the Moon through this a few years back, and it was brilliant, and I'm keen to share the sight with my children. The problem is I can't seem to focus the view finder. I can find the Moon of the spotter scope, very clearly, but when I look through the main eyepiece - a PLOSSL 10mm - I can see the light of the Moon in the back ground , but can only seem to focus on tree branches that are in the foreground- very clear relief - in the foreground. What am I doing wrong, and how do I fix it if possible? Very grateful for any replies. Thanks.
  9. Hi All, New challenge I am running into. When I add a filter wheel on my Bresser AR102s I run out of travel when trying to focus in. I have removed all the extensions and still can't focus in. Am I out of luck or is there something I can do? I am reading up on Focal Extenders am I heading down the right path? Thanks for your help.
  10. Hi, Decided to have a go at a Bahtinov Mask today. I used the generator at http://astrojargon.net/maskgenerator.aspx to create an image which I printed on a laser printer. This was then taped to a piece of thick black card and the slots carefully cut out using a scalpel. I left some tabs of card around the edge. I then took a strip of black card and joined the ends so it fitted around the end of the scope. The front was then attached via the tabs and it was all taped up with black insulation tape. No stars out tonight to test it on so had to make do with a distant street light. Not ideal but it shows the principal. Very happy with this simple tool and can't wait to try it out for real. The mask front cut-out with tabs around the edge Assembled In focus Out of focus
  11. I have yet to be entirely happy with the focus on my pictures. When cropping them quite heavily (I use a DSLR, so smaller DSOs need a bit of cropping) the stars always feel a bit bloaty and look out of focus - much more than the image from the full frame. I have been using the focus aid in APT, checking out the FWHM tool. I don't know much about the science behind it, but my understanding is that the number needs to be as low as possible. Last night I was focussing and tweaked it down to around 1 to 1.5 - obviously it was fluctuating with the atmosphere/interference, but I thought that it was a pretty good score. I locked the focus very carefully, making sure that I didn't change the figure - I usually tighten half-way, check the value and then re-do it (if needed) before locking it down completely. I only twigged tonight that DSS shows a FWHM maximum on the light frames after it has checked them and, when I looked for the images I took last night, the FWHM figures were coming out at over 4.5. I am presuming that this is far from ideal focus, but is also a long way from what I thought it was. Is there any relation between the FWHM measurements in APT and DSS? Is there a reason for the discrepancy or am I just going to need to be even more careful with focussing? Are there vital settings in APT that I need to set? Will check for more scope related settings next time I get out. Might also need to get the Bhatinov mask out rather than relying on just APT Focus Aid. Thanks, as ever, for any thoughts
  12. Hi all. after receiving my scope yesterday I went outside for about half an hour with it and was quite impressed on how easy everything is to set up and use. However I have two questions that I would like answered. When viewing at the moon using my 25mm eyepiece I could see a blue and orange haze around the left and right side of the moon. Was this because I didn’t have eyepeice focused probably or is there another reason? And also while focusing I had a lot of vibration is there a way to reduce it. Today I tried to get my red dot focused aligned with my telescope and I think I’ve managed o do it correctly but was concerned that my target was to close. My target was the Ariel on the roof top as I didn’t have any clear targets that were far away I had to choose that. I managed to get it aligned probably but heard that the targets were supposed to me further away? Man Thanks
  13. Hi SGL Wizards, I'm using an ED-80 with HitecAstro DC Focus, and am controlling it via SGP Pro. I've got autofocus working well (hooray!) but notice that each night the Focus Control's Current Position number gets larger and larger. For example, a month or so ago it was around 9000 for focussed stars with a H-a filter. Tonight it's 12884. Is this normal? I'd expect the number to be absolute, i.e. always around the same number but with some slight variations given temperature and the like. Thanks in advance, - Lee
  14. I am using a Baader Hyperion 36 mm 72° eyepiece with the Starwave 152mm Refractor and cannot get focus unless I use extensions for visual - for imaging it is imposible. Any Ideas ? Ernest Ernest
  15. Good night, I have a Shoestring Astronomy automatic focuser. But it does not memorize the absolute position... Will it be necessary to add encoders in order to use it on a full robotic setup? I'll use SGP. Thanks so much, Aleix
  16. Hey guys I'm new to telescopes and well I have tried reading up on possible fixes, nothing works. First day I used it I was able to get a clear image on the lowest power inserting a 20mm eye piece and it would focus. Attempted my first night to look at Mars. Well it was a big blur and nothing worked. Next day I was attempting to look at a mountain and no matter what I did or try it remained blurry. Focus dial is free moving but the image stay as a massive blur. With no eyepiece it's still all a blur. If I look through it backwards there is a clear image however looking from the eyepiece it remains blurry. Im not sure what to do now. Any ideas?
  17. Before anyone says it, I have got and fitted the short shoulder-less nose piece and removed the 5mm extension ring it comes with. With that out of the way, the DMK41 arrived today. I ordered the short nosepiece with it, and putting them on the PST the camera body is flush with the end of the eyepiece holder on the PST. It isn't getting any closer. In a quick and frustrating play, I just can't find focus. The sun spent most of the time hiding behind clouds so I didn't get much time, but I went near enough end to end on the focus scale. Before I gave up the sun was behind a TV aerial and trees, and using that as reference I know I can focus closer by rotating the knob clockwise. Infinity should obviously be the other direction, so I wound it as far as I dare anti-clockwise. It hits some resistance and by this point the knob sticks out quite far. So I'm hesitant to go further. Is this normal? Should I keep turning or will something fall apart before I hit an end stop? Any other tips? I did manually adjust the exposure so the sun wasn't blown out, but I haven't really had time to play with the settings yet. Given the sun has gone down now, I'll obviously can't try again until tomorrow (weather allowing).
  18. Hi I have a Skywatcher 200PDS. I managed to get images of saturn, jupiter with the telescope and the ASI120MC-S camera. However, to get a bit more magnified image of these planets I got myself a Barlow Tele Vue 3x and Revelation 5x. I am having trouble with this setup and really disappointed now. I am not able to achieve focus with any of these barlows using my planetary camera. I have added extension etc. but no luck whatsover. I just see a blank black video preview in SharpCap. I have seen people using the same setup and getting good images out of those. Any help highly appreciated. Thanks and Regards, Yogesh
  19. Hi I’ve recently got some shiny new kit, and last night was the first clear skies here when I had the opportunity to try it all out. This is not my first time observing, so I’m well prepared for unexpected issues, but it is my first time ccd imaging. There was lots of learning, including; cable management needs to be better, I (still) never have the right USB cable, and the focus tube needs some mechanical refining to address slippage. But the problem I’m not sure how to solve is one of focus. I bought the SW Trius 814 kit (Trius 814, mini usb filter wheel with OAG, and Lodestar X2) and naively thought that perhaps if it was sold together it would all work together. And maybe it does, I’m not immune to stupidity I could achieve focus with the 814 relatively easily, and even captured a test image and solved it in Ekos, all very heart warming. But I couldn’t then get focus with the Lodestar X2 (attached to the integrated OAG in the mini wheel) without pulling the focus tube out considerably further (approx. 50-80mm I didn’t measure). This obviously isn’t ideal. Am I missing something? The setup is: ED80 -> Field flattener -> filterwheel with OAG -> Trius 814 with the Lodestar attaches directly to the OAG. All advice appreciated, and please don’t imagine that I won’t have missed something ‘obvious’ Thanks Justin
  20. Hey ? I took delivery of a Skywatcher 200p last night and got it set up ok I think. I got a good view of Jupiter with the 25mm lens but when I put the Barlow lens in I couldn't focus it. I also tried the 10mm lens but it made everything grey, no real light comes in at all. It came with a thing that might be called a focuser extension, not sure, but it didn't help. What rookie mistakes am I making?
  21. Evening all, After a bit of faffing around with imaging train to resolve some tilt managed to move on to fitting of custom built robofocus solution finally got my scope back after what seemed an age (2 weeks ). Of course it timed perfectly with a hectic week of work and a full moon and lots of cloud so managed to get out Wed night to set up FocusMax which was an interesting experience - worked first time except for the last focus image which system defaulted to 0.1 seconds - seems like an oversight when application calculated so many exposure times in the focus run you would have thought it could identified this value was not sufficient. However it worked once I found this out and would advise any newbies to review all settings - I actually updated my *.ini files manually to alter a few bits that do not appear to save. Little help for any first time users that may suffer the same issue. A patient wait (yeah right, very frustrating wait) and had 1.5 hours of light before the moon came above my horizon to get a few shots. V-Curve worked perfect getting < 1 FWHM's on focusing subs which is by far the best focus I have had on scope. In short manual focusing for imaging on a fast scope is a skill I don't have and would recommend investment to anyone. Only managed 2 x Ha/Oiii/Sii x 600 before moon interfered with veil which I selected for its brightness as new did not have much time. Here is a that Ha and a sample colour - for 2 light subs was impressed and officially an advocate of auto-focusers now! And finally apologies - now I have a working rig I am obviously totally responsible for cloudy nights for at least next two weeks. Paddy
  22. I recently acquired a Meade Lightbridge 16" scope (f 4.5), and realized that I'm unable to focus with my barlow attached ( the barlow is a Celestron X-Cel LX 3x barlow). After some experimentation, I found that it's because the focal plane of the primary is too short - it's just at the end of the focuser when it's fully retracted. By removing the 2"-1.25" adapter, I found that I'm able to focus with the barlow if it can go about 6 mm further in. Other than cutting my truss tubes to shorten them, or buying a lower profile focuser, is there any cheap, DIY method by which I can achieve focus? An astronomer friend of mine suggested fully tightening all the primary collimation knobs, so that the primary mirror moves up a little inside the OTA, thus bringing the focus further out of the focuser, but that didn't help ( it probably moved upwards only by a couple of millimeters)
  23. I have been researching Radio-Astronomy and have not been able to determine information on antenna directionality. Do RT mounts require axis motors to keep the object in it's focus area? What are the resolution ranges and factors that determine the discrimination of say one star from another which have very small degrees of separation?
  24. Two questions if I may. 1. Can the three screws marked by yellow arrows in the picture below be used to mount a second finder shoe on the C11 EDGE HD scope, permitting both a straight through and a right angle finder to be fitted? 2. The EDGE has field flattening optics inside; is the distance from the visual back to the chip critical, or by making adjustments to the position of the mirror to achieve focus on a chip say 250mm away from the visual back mean the field will still be flat at that distance? Thanks. James
  25. hi..i have star discovery 150p scope with rockandpinion focuser... low magnitude is ok, but with greater magnitude (8mm eyepiece) i just cant get nice focus...stars canr be dots... i colimated it perfectly with lasercolimator
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.