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About timwetherell

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  1. timwetherell

    Advice on 4" APO

    Just to toss a different idea in the mix, I'd almost be inclined to consider a shorter 100mm like the esprit 100 triplet if it's financially feasible? The rationale being that a highly corrected triplet will work very well on planets and doubles if coupled with a good barlow but at the same time, with a 30mm 80° 2" EP it will offer up to 4.5° fields of view, which virtually no other telescope can! I use mine in the "super wide" mode a lot because that's what it does exceptionally well (better than my big scope) but it's also superb for showing high mag stuff when our club does outreach events. If down the track you did decide to do some astrophotography too, this would be spectacular choice for that
  2. timwetherell

    SW Esprit 100ED Focuser

    yes, it does on mine, though it's only a very slight effect, nothing that would in any way affect performance in actual use
  3. timwetherell

    SW Esprit 100ED Focuser

    My 100 SW esprit has a slight stiffening on the manual focuser at 7mm and 67mm
  4. timwetherell

    JamesF's observatory build

    I had that concern too, but ended up using windows that were only 150mm wide so it's impossible to get in through them. You could always have a curtain or shutter to stop anyone looking in. Personally, I'm really glad I put windows in because a bit of natural daylight in there makes working on the scope much easier and more pleasant. I open the roof too if possible but more often than not, it's raining!
  5. These are really nice instruments! And whilst not exactly cheap, they represent excellent value for money. Pretty awesome carry case too - well, it's more of an armoured personnel carrier!
  6. 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."
  7. 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
  8. 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!
  9. 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
  10. 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
  11. 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
  12. 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!
  13. 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!
  14. 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!
  15. 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

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