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_supernovae_remnants_winners.thumb.jpg.a13d54fa405efa94ed30e7abd590ee55.jpg

geoflewis

Advanced Members
  • Content Count

    909
  • Joined

  • Last visited

  • Days Won

    1

Everything posted by geoflewis

  1. I also use PS2 with local ANSVR for blind solve as backup if the initial slew is too far off for PS2, which is rare, but happens sometimes. I also have my pointing accuracy set to 5px which is close enough for me. I'm guessing that you don't want to be too optimistic with this setting if your mount isn't capable of very accurate pointing, as you could just keep going round in a loop until you've used all attempts and it 'fails', plus I dither so the images move around once I start capturing anyway. Given that your initial slew is a few hundred pixels out and then never corrects, I'm wondering whether the command to slew after solve is working at all. You could try nudging the mount further away and then solving again to see if the mount then moves at all. Geof
  2. I'm sure. When I was about 10 years old (that's some 55 years ago), living in North Norfolk, I recall that my best effort was counting 17 naked eye stars in the Pleiades - now I'm luck to count 7...!! The skies are nowhere as pristine and my eyes are even worse, especially having to look through my specs....!!
  3. That's pretty much what I've been getting excluding the 4 corner stars, but that was before the survey started and tonight I have 0 stars.....!!
  4. As I understand it you DO NOT include the 4 corner stars, clockwise Belelgeuse, Belatrix, Rigel and Saiph. This is from the BAA website... Hope this helps. Geof
  5. I've been clouded out all night, but an astro friend in west Norfolk about 30 miles away has had pristine skies... . Theres a continuous band of rain cloud moving due south off the North Sea that won't leave me alone
  6. As well as submitting your star count to BAA/CPRE, this is also a useful resource (both to use and to submit) as it shows how many stars you should be able to see at each magnitude range. https://www.globeatnight.org/webapp/ Your 12 stars suggests somewhere in the mag 4-5 range, which I think is consistent with your sqm reading and Bortle 6-7.
  7. Well that is a suberb collection of images showing Saturn's changing tilt over decade. Love it. Geof
  8. Wow Dave, that's really colourful. I can never get colours like that in my stars - how do you do it?
  9. That's a really nice result Dave. I keep thinking that I should buy something like a 24mm, or 35mm lens for my astro-modified Canon 600D to shoot really widefield targets like that. I have a Nikkor 18-200mm zoom, but my Nikon DSLR isn't astro-modified, so not sure how well that would work on Ha rich targets like Orion - maybe I should try it at 18mm as an experiment.... Cheers, Geof
  10. don't you mean flat? oops sorry, wrong thread.....
  11. Also as confirmed by email just received from the BAA Aurora and NLC director.... Aurora Alert A coronal hole impact started to hit Earth yesterday at 22.00UT 30th January 2019. Wind speeds are now at 520kps as of 22.00 31st January and it has reached a level 6 triggering a G1 storm. I have had sightings between cloud up to 30degrees high. It should be visible to as far south as northern England and could go further, and it has been seen as far south as Dundee.
  12. Thanks Ian, let me do some more research, then if I'm still interrested I'll PM you. Geof
  13. Hi Ian, if it's still available I might be interested in just the reducer as I already have the same TSAPO100Q, which as you rightly state is a gorgeous scope, but I would like to be able to shoot wider field targets without buying yet another scope. I sent Teleskop-Sevice an email asking their advice about this only last week, but haven't had an answer yet, other then their automated holding reply. Do you have any images taken through the reducer that I could view to see what they look like please? Cheers, Geof
  14. Looking at the sunlight coming through the door glass, maybe it's because your polar alignment is a bit off....
  15. The only time I've felt really self-concious with the hobby was when I tried to observe the Venus transit back in June 2012. It would already be in transit at sunrise, so I needed a low eastern horizon. I set myself up with my 12x70 binos fitted with homemade baader solar filters at the edge of a large recreation ground, about half a mile from my home, basically me sitting on a garden chair facing east with the binos from about 4am. The sky was completely overcast, but I remained hopeful. Being a recreation ground I encountered quite a few early morning dog walkers and joggers, most of whom just gave me a stare, but some asked what I was doing. It didn't help when I said I was waiting for the Sun to rise and they looked at the overcast sky and shook their heads. I did wonder if the blue lights (or white coats) would turn up, but they didn't - then neither did the Sun......!!!
  16. Hi David, good collimation is essential for planetary imaging and I mean very good, not just close, so it is worth taking time over this. I know some imagers will check collimation every single session, not something I do, but I do it pretty frequently when I'm imaging the planets. Collimation is something over which you have control, but seeing is not and trust me there are nights when the sky looks pristine to the naked eye, when turning a scope and camera at the planets tells a completely different story. Below are examples of the one (yes just one) night of excellent seeing that I had last year, alongside another where the seeing was at best fair. Same well collimated scope, same camera, just difference in seeing conditions..... There were many nights when seeing was so bad that I couldn't secure focus at all and attempts to collimate the scope on a bright nearby star just showed a boiling blur ,with no difraction rings at all. The person who taught me most about planetary imaging told me many times that the most important aspect is patience. FWIW I got that image on 6 May after a run of 4 consecutive 'clear' nights when I couldn't focus suffiently well to get a single image. I almost didn't bother going out on night 5, until my mentor said, 'you know what I've told you about being at the scope every single opportunity' so I opened the obs and wow, just look what I'd have missed. That image was selectecd by the BAA as one of their images of the week and is in their latest journal as one of their challenge images for 2018. Of course I'm very proud of that, but my reason for sharing it alongside a poorer result is to demonstrate just how significant seeing is compared with everything else. I hope this helps you to keep persevering. Good luck, Geof
  17. Thanks Martin, I tried a few things with those stars including removing them before applying the high pass filter used to sharpen the shock waves in the nebulosity, but I couldn't loose those rings. Having looked at each of the LRGB stacks they seem to come mostly from the Blue data. I guess my processing skills just aren't up to muster for this challenge...
  18. Hi David, when did you capture that Jupiter image; how high in the sky was it. Jupiter is currently a very low target from the UK, so you will experience a lot of atmospheric dispersion with a colour camera. Also seeing conditions are a major consideration for planetary imaging, such that even with a well colimated scope, accurate focus cannot be achieve during poor seeing. That said it is always worth checking your collimation, but again you need good seeing to be able to do that reliably. As Michael says, provided your zero shift focuser can travel both sides of focus, then your rig should be able to achieve good focus IF your scope is well colimated and for planets ONLY when the seeing allows. Seeing is very fickle, so one just have to keep trying for those often fleeting opportunities. Good luck, Geof
  19. I started this as a test image having swapped my QSI camera from the C14 to the 4" APO early in December, after completing the Blue Snowball on 9 Dec 2018. My primary intention was to shoot some wider field targets in Orion during Dec/Jan with the Witches Head top of my list. Unfortunately the weather since then has been such that I stuggled to get enough data for an LRGB image of M45, never mind shoot the lower altitude Witches Head. I finally got a extended period of clear sky on 28 Jan 2019, though even then transparancy was poor, with increasing haze and passing cloud as the night progressed, but with the upcoming forecast again poor I pressed on. The blue channel data in particular turned out very poor, with large halos around all the main stars, which has fed through into the final image. Anyway, here's what I got from 6x10 mins each RGB and 17x10 mins L Thanks for looking. Geof
  20. Superb....!! I love a well done globular cluster
  21. Yes, you should redo darks and calibration. What software do you use for guiding? Ideally you should create a new profile for the camera binned 2x2.
  22. You beat me to it......
  23. Hi Gav, I always bin 2x2 with my X2 (the same as I did with the original Lodestar). NB the Starlite Xpress X2 handbook (page 4) recommends binning when guiding with the X2 - "The preferred guiding mode is 2x2 binned, as this gives both fast downloads and high sensitivity without any ‘interlacing’ issues." See the below link for the full handbook. https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=2ahUKEwitkZP4rpDgAhXuXRUIHSk6CosQFjABegQICBAC&url=https%3A%2F%2Fwww.sxccd.com%2Fhandbooks%2FHandbook%20for%20the%20Lodestar%20X2.pdf&usg=AOvVaw115LwmEFnVPnw8Xj0GOup_ Cheers, Geof
  24. Well that's definitely worth getting back in the game for. It's a cracking image, one of the best I've seen. I love the way the eclipsed Moon seems to dangle in front of the star field like the rusty red orb that it was . Cheers, Geof
×
×
  • Create New...

Important Information

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