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.

Welcome to Stargazers Lounge

Register now to gain access to all of our features. Once registered and logged in, you will be able to contribute to this site by submitting your own content or replying to existing content. You'll be able to customise your profile, receive reputation points as a reward for submitting content, while also communicating with other members via your own private inbox, plus much more! This message will be removed once you have signed in.

  • Announcements




Advanced Members
  • Content count

  • Joined

  • Last visited

Community Reputation

15,177 Excellent

About ollypenrice

Contact Methods

  • MSN
  • Website URL
  • Yahoo

Profile Information

  • Gender
  • Interests
    Imaging, Cycling, Thinking, Literature, French culture, Mountains...
  • Location
    South east France, Lat 44.19N.

Recent Profile Visitors

8,078 profile views
  1. Hola! Welcome to SGL from an Englishman living in south east France. Hablo muy poquito Castiliano... Olly
  2. Oh, it's very good! More data will help but the key blues are already in play. Olly
  3. Lovely job, at once bold and delicate. What a target this is! Olly
  4. Good! There is plenty of reflection in this area, too, so adding broadband should be exciting. Olly
  5. Dealers do differentiate themselves in ways unconnected with price. FLO have an exemplary returns policy, for instance. Ian King is an extremely knowledgeable and active astrophotogrpher. Advice, honesty, service, backup... these matter 10x as much as a few bob off in the astronomy world where the kit is often at the limits of technology. Olly
  6. Without doubt the programme to sort out colour is Pixinsight. It does many more things besides but I would buy it just for Dynamic Background Extraction, which can take out vignetting, colour gradients and colour imbalance with almost supernatural efficiency. I run it on absolutely every colour layer I produce, despite living at an extremely dark site. Olly
  7. Yes, this is a good point. Olly
  8. I've managed to add about 1.6 of the missing 2mm. We imaged M63, the Sunflower, last night and the luminance strikes me as very sharp. I also did some parfocality testing and, with this camera, there isn't any! The colours require individual focus, which wasn't the case with the 11 meg chip. Still, that's not a problem once I know about it. Blue came down to a decent FWHM after a bit of effort. So it looks promising. I also found that darks do more harm than good, creating a lot of dark pixel noise. Bias as dark gives a significantly cleaner result. Yes, my idea is to decide which is best, big scope-big pixels or small scope-small pixels. Only one way to find out! Olly
  9. I've just started using a 460 alongside my 'high noise' Kodak full frame CCD chips. We have to define noise. If we look at darks we see that the Kodaks look like a snowstorm while the Sony 460 looks clean. But, and this is a big but, when we take a picture and use whatever means (darks, bias, bad pixel map, etc) the noise issue takes a strange turn. I find that the Kodaks take more of a stretch more easily and actually give a better signal to noise ratio on dark sky background. There are a lot of variables but don't assume that the Sony chips are the clear winners. I'll be able to say more about this with more experience and will post what I find. Sara Wager's website also discusses this issue. Olly
  10. You're asking a lot from one system. The 460 has quite a small chip so it will never be a widefield option in the modern sense but it will be OK in an 80mm refractor. You'll get nice workable resolution in the 300 to 1000mm FL range. The pixels are very small for a C9.25 though. Using the focal reducer and binning 2X2 you'd get 1.33 arcsecs per pixel, which is OK. Without the reducer, or unbinned, would you have the guiding accuracy and the seeing to make it worthwhile? I'd be surprised. Olly
  11. Pieter has it, and he knows what he's talking about because he has built one of the best fast imaging Newts currently in operation. In truth £1100 + scope is not expensive for an F2 system, it is ridiculously cheap. That's because, in my opinion, it cannot be done. As Filroden said, look at the results with a critical eye. This system is not on my wish list, despite the fact that, as a provider, a fast system is what I want to offer my guests. However, I also want to offer them a high quality system which works nicely night after night. The F3.3 reducer only works on miniscule chips not longer in regular circulation. Fast is expensive. Almost without exception, fast is, however much you spend, difficult. Think before you buy. Olly
  12. I have added about 1.6 of the 2.0 missing mm to the chip distance from the TEC 140's flattener and will be interested to see if the Atik 460 plays better in this configuration. I can't say I'm optimistic but who knows? There is no easy way to obtain the perfect chip distance but on such a small chip I can't think it matters. We have a nice test target ce soir so let's see what it gives! Olly
  13. I've just bought what you need to tidy that lot up a bit! It is a truly lovely rendition of those vast dustfields, showing them clearly but without exaggeration. Natural but pin sharp, as ever. Where does that whiff of Ha lead? Olly
  14. 10 inch, the original version illegally marketed as a Ritchey Chrétien. Olly
  15. Well, it's about time, I'll give you that!!!! lly