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_comet_46p_winners.thumb.jpg.b3d48fd93cbd17bff31f578b27cc6f0d.jpg

All Activity

This stream auto-updates     

  1. Past hour
  2. They're Here Plus other updated and new SX Trius cameras.
  3. Has anyone owned or used both the CEM60 and CEM60-EC and compared the two as far as guiding performance? I've seen guiding stats from people who've owned one or the other, but not really much from someone who's had a chance to use both and compare. Reading various threads it seems there's split opinion on whether the RA encoder is worth the extra cost over the CEM60 if you are guiding. Isn't another consideration however, the increased spec for PE from +-5" p-p to < 0.5" rms for 5 min. Which firstly raises the question, one says peak to peak, the other RMS and for "5 min". Are these two specs directly comparable? If they're directly comparable and given that a sharp spike that was still in spec would be <0.5" and able to be guided out (depending on pixel resolution). Where as with the non EC a sharp spike could be up to 5" and still seen as in spec, although I've not seen anyone reporting anything like that bad, it feels like worth including in any decision? One other question, the specs say "60 lb (27.2kg), exclude counterweight*" does that mean you need to consider the 21lb counter weight leaving 49lb for OTA/other gear,or that the 21lb counterweight can be ignored and the 60lb available for OTA/extra counterweights?
  4. Thanks to all who showed an interest, item now sold
  5. Hi all, Having read a fair bit of this thread and also being impressed by the quality of the images, I am very tempted to buy a 130 PDS and give it a crack ! A couple of questions though and I apologise in advance if these have already been asked ad nauseam. I have enough money to invest in a HEQ5 pro. I also have enough to put my first steps into mono ccd imaging. I don't have enough left over for the recommended 80mm esprit, so I thought I might have a go with this impressive scope. 1) I will need to saw off the focussing tube from the get go ? I find this a little bit scary. 2) do you need to do the sawing if you buy a 150 PDS? 3) this scope vs a 6 inch RC? any major differences? the thing putting me off the 6 inch RC is the reduced FOV. Is this necessarily an unsurmountable issue? 4) can you please recommend a ccd mono camera that will not under/over sample with this particular set up? So many questions !! Thankyou one and all and clear skies ! Andy
  6. Welcome James There is a Dorset group on SGL and we get together to observe/image from time to time. There are also a couple of local clubs if you are interested in attending. Whereabouts are you based? Clear skies Peter
  7. I have the CGEM and I'm very happy with it... much more managable... much cheaper.... great mount, even for astrophotography upto 2000mm FL. Look at the CGX-L mount if you're wanting to spend that sort of money... if I'd be looking at upgrading, this is the mount I'd be looking at.
  8. That's essentially what I did with my previous obsy. I used a plastic DPC as a skirt running from under the lower shiplap and down over the sleeper.
  9. I would add a yes to this, I've had mine for a year and have been using it with a William Optics Z73 to great effect. I think it is hard to beat in terms of performance vs. weight vs. cost, if you are looking for a portable or beginner mount, as I was. You can see images from the setup from the Astrobin link in my signature...most of the pictures are with the CEM25P. Autoguiding is a must, though, 45 seconds was the most I could bear unguided, although I've seen some people get amazing results with 2 minute subs. Seems robust - used it in winter temperatures of -5C and also took it with me to Mauritius last year (I live in the UK).
  10. If you click the N, S, E, W or Z in the bottom right of CdC it will always switch to AZ mode and require manual switching back to EQ. It's my biggest irritation in this otherwise awesome program.
  11. oops, I meant I apply the MLT at linear stage, not non-linear. Will amend my post above
  12. Hey cool, thanks for the reply. I just pulled the trigger on it! Got any photos of or from your setup?
  13. I've been getting decent results with Straton recently, I use it for tonemap combining narrowband images. I think the key is to use Straton to produce the stars, then subtract the stars from the image in PI or PS. It's a bit long-winded though. Here's what I do, from memory since I'm at work and don't have a Straton screen in front of me: - works in both linear and non-linear - open the image in straton - open the same image again, as the reference image - set the stretch slider to suit so you can see what you're doing, think it's top-middle ? - there's a slider bottom right that I think goes from remove more stars to preserve more nebula, or something like that ? Set it all the way to the right. - in the menu, remove stars from the image - then zoom in a couple of times and go all over the image looking for stars it's missed, you can remove them manually, I think there's a clickable tool for that, or is it alt+click on the star ? Might have to do it 2-3 times on stubborn stars. The undo tool doesn't work, just makes a mess. - once done, there's a menu option that says something like 'subtract image from reference image' - do that, and you'll just get the stars and nothing else - save it and close Straton, then load that star file in PI or PS or whatever. - zoom in again, looking this time for anything that looks like it's not a star, comparing to the raw image will help, and clone-stamp it out, prevents bright bits of nebula getting removed - once done, you can then subtract that star image from the raw image in PI or PS. Key is that 100% subtraction seems to over-do it. So in PI, use pixelmath and do something like '$T-0.995 * star_image', or I guess in PS you would add the star image as a new layer, blend mode subtract, and opacity 0.995. Tweak that 0.995 parameter to suit, too low a parameter will leave lighter bumps where the stars were, too high will leave dark bumps, get it just right and they'll disappear. - you might have issues cleanly removing really bright stars, halos or newt diffraction spikes.
  14. I didn't know about the Microsoft option - I've been trying mirrorop (not necessarily foc).
  15. I thought I’d share this from last time I stripped it lol Every time I always swear it will be the last time
  16. Now I wonder if that happened to me, on Monday! I had to skew towards CdC's Neptune to find the Sun - rather than just to the SW of the big orange thing in the sky.
  17. I've tried to lighten it a bit Dave @Davey-T, using your suggested technique
  18. Thats exactly why I asked tgem if they will sell the neq6 or eq6r, they have a higher capacity
  19. I dont really have money for a long focal lenght and fast refractor..thats why I am looking at newton, but I found a 6" RC now for like 400$.
  20. I am considering just shipping mine off to darkframe optics when the time for it comes..
  21. You should be able to do it, though of course depends on the individual components you have. I managed it with a similar setup and although there isn't much space to play with, it can be done. You will need a fairly low profile OAG, the one I have is only 16mm thick and the coma corrector will need to be inserted into the focus tube. Steve
  22. Hello from Dorset, I have been following SGL for a little while now but have finally created an account. I've been interested in astronomy since I was a child, however I can now dedicate more time (more, but not enough) and some money (definitely not enough) to the hobby I am hoping to take it to the next level. I am interested in astrophotography and have started to collate an imaging rig and have completed a few nights of imaging with some beginner success. I am really looking forward to my astro journey and hope to learn a lot from the community here. James
  23. Sorry about the late reply, just been bogged down with a lot of work this morning. I completely agree with everything that @Jkulin, @ollypenrice & @pete_l had to say. I'm just trying to make sure i am going to be making the right decision but i do also know that we all have different experiences with the products we get in the end. Some are good and some are just painstakingly bad but before i embarked on the research journey, i've heard nothing but good stuff about their latest CEM60's and CEM60EC's .... but in my eyes it's always good to know about the potential issues rather than not knowing which might lead you down the rabbit hole. I shall soon be pulling the trigger ... soon
  1. Load more activity
×
×
  • Create New...

Important Information

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