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timwetherell

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About timwetherell

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    Male
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    Somerset
  1. Baader Classic Orthoscopic 10mm eyepiece in exactly as new condition in origonal box and with all the caps and other bits. asking £40 including postage within the UK "Baader Classic Orthoscopic eyepieces are designed with premium optics and coatings for superb corrections, this eyepiece design is particularly suited to high power Lunar and Planetary observation. With winged eyecup to help combat stray light and HT multicoatings for maximum contrast and light transmission."
  2. timwetherell

    Review of the Sony A7S

    Looking at your video tour of the milky way (https://drive.google.com/file/d/0B3Ky5pyZvsINUWpobUZEeXVJeWc/view) Am I right in thinking that the A7s will live display integrated exposures? In other words, take a series of short exposures (say 1/2s) and feed them continuously one after another to the display on the back? I'm wondering about using this camera (or another like it) as a poor man's image intensifier eyepiece for pushing the observing envelope of my 7" a bit more into the deep sky side of things, so being able to do this would be very desirable in that role
  3. timwetherell

    Sony A7s or A7iii for astrophotography

    The only thing is that I don't have 240V in the obsy, just 12DC so would have to be a low voltage version There's so many possibilities and so many subtle nuances to get my head around I may be on a long learning curve!
  4. timwetherell

    Review of the Sony A7S

    Thanks for this review. I'm contemplating getting a dslr for astroviewing/imaging and the Sony A7s is one of my options. This comprehensive and detailed review gives me a wealth of information! Especially coming from an astronomer's perspective (most reviews are for moody low light cinematography) so thanks again for sharing
  5. timwetherell

    Sony A7s or A7iii for astrophotography

    Yes, that's a definite possibility. The 600D is a cracking camera for day to day photography but not great in low light. I'd prefer to have a simple setup such as a camera unit with integral screen or camera with an HDMI output to a seperate mini screen rather than have to run a PC and stacking software in the obsy. I have friends that do that stuff and they get great results but I'm more after the immediacy of visual observing - I guess because that's what I'm used to. If I could find a sensitive enough video camera that would work very well. I did see a canon ME20F-SH which has amazing low light performance then I saw the amazing £17,000 price tag - which is so far beyond my budget it would take the light from my budget a million years to reach it
  6. timwetherell

    Sony A7s or A7iii for astrophotography

    Primarily, I'm hoping to create an electronic viewfinder but I'd probably want to take the odd snapshot too. But I'm not trying to capture anything like the fabulous multicoloured images people achieve with stacking and cooled cameras. I've tried with the D600 at iso6400 (its max) and to be honest, it's hopelessly noisy and insensitive - I think because it's an older camera/sensor. I'd need something with an inherently more sensitive CCD to start with because as you say, just boosting signal also boosts the noise. The A7s interested me because its large sensor and low pixel number should theoretically mean bigger pixels and less noisy low light performance. But the star eating noise reduction algorithm is a major concern! If it were fifty quid I'd just give it a bash, but a grand is a different matter
  7. timwetherell

    Sony A7s or A7iii for astrophotography

    I'm hoping not to spend anything till I've learnt more about these things But from what i've read,the A7iii doesn't have the star eating problem but it's about £1600 whereas the £1000 a7s may indeed have that problem - that is one of my concerns. Canon would be a very attractive option for me because I have a few canon lenses already that would work with it. My concern with the 6D would simply be that the maximum iso appears to be 40,000? My 600d is a lovely camera but at its max iso of 6400 is horribly noisey. Perhaps the later model canons improve dramatically on that noise performance? One thing that's fairly important to my particular application is that I'd like a live view that provides greater sensitivity than just my eyes which the sony is reputed to do - but perhaps the canon can too? It's definitely worth a look because £500 will be a lot easier to find than £1600!
  8. timwetherell

    Sony A7s or A7iii for astrophotography

    Yes I thought about that as I have a 600D which is a nice camera. But I'm rather drawn to the high iso of the sony because in a way i'd like to use it as a poor man's photomultiplier eyepiece If I could use a canon in that way too it would be a definite plus!
  9. timwetherell

    Sony A7s or A7iii for astrophotography

    Yes I read about that! One review said the A7iii didn't have this problem but I don't know about the a7s - that's one of my concerns!
  10. I'm not as astrophotographer as such, but am toying with the idea of buying a general purpose dslr that will also double up as a rough and ready astro camera for my 7" f7 refractor. I'm not trying to take wonderful images so much as see things that I wouldn't normally be able to with a relatively limited aperture, such as the moons of uranus or spiral arms on brighter galaxies. And if I'm going to spend quite a lot of money, it would be nice if it could double up as a good quality general purpose camera too - hence my inclining to the sony's rather than dedicated astro gear. A dslr also offers the advantage of an all in one package. My question though is would the 12mb A7s with it's bigger pixels and higher 400,000 ISO be better than the 24mp A7iii as an astro camera? I'd be really interested to hear if anyone had experience with either or both? Thanks
  11. timwetherell

    Total novice to this, but..

    Yes, that would be a correct assumption! I'm a fairly experienced visual observer but know next to diddly about astrophotography. My thinking is that the 7" has about all the resolution the UK's skies will support 99% of evenings but it's not really much of a deep sky scope compared to something like a 16" sct or 20" newt. I don't have the money or the space for a second deep sky scope so I'd toyed with the idea of selling the 7" to get a c14 but that brings with it as many problems as it solves. I was visiting friends recently and they showed me a sony dslr they use for live video projection at outreach events and it got me thinking that if I could digitally boost the light levels of the 7" to that of an 18" it could offer a solution within a reasonable budget? My dream device would be a 1" sensor with electronics to give a live update to a high resolution miniature display (perhaps integrating over 1/2 second) with magnifier, all built into a neat self contained 2" eyepiece for less than a grand. That's probably asking way too much, but something along those lines would be ideal. I'd imagine within 5 to 10 years it will be possible to get them off the shelf but for now it may have to be a cobble together job Your Lodestar mono USB camera sounds interesting! i'm not particularly bothered about colour but say for example it would be nice to see the central star of M57, or moons of uranus and the spiral structure of brighter galaxies.
  12. timwetherell

    Total novice to this, but..

    Mmm, some interesting stuff on there. One of the micro cameras might be very much the thing!
  13. timwetherell

    Total novice to this, but..

    Not even sure if this is the right place to ask, but anyway I have a 7" refractor that I've used almost exclusively for visual observing for many years now. I'd been wondering about getting a bigger aperture scope but talking to some friends I've started to wonder if another option would be some sort of CCD based real time imaging. The ideal thing would be a big ultra sensitive CDD live feeding a small high res display in more or less real time. In some ways I'm quite surprised I haven't seen such a thing available - perhaps they are? I'd really appreciate any help and advice anyone could offer as to what would be a good camera etc? At this point I don't even know if I want something like a mirrorless DSLR or a dedicated astro camera. The main requirement is that it's relatively stand alone, I don't really want to have to run PCs in the observatory or get heavily into astro imaging, just looking for a light boost! I'm pretty rubbish at football so don't have David Beckham's budget, but would probably stretch to a couple of grand ish if needs be.
  14. timwetherell

    Show us your Frac

    Yes, yes they do!!!
  15. timwetherell

    Viewing not great on mars

    I've had much the same experience this year. My 7" refractor which should and can give splendid views of mars isn't doing any better than a 4". My new atmospheric dispersion corrector does help a bit but short of adaptive optics, I don't know much will offer a great view of mars when it's barely 10 degrees up crossing the meridian.
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