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NigeB

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    235
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About NigeB

  • Rank
    Star Forming

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  • Website URL
    http://www2.le.ac.uk/departments/physics/people/nigelbannister

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  • Gender
    Male
  • Location
    Rutland, UK
  1. Excellent! The weights look good; the bit on the other side looks even better...! Nice image. I've had similar weather issues. The latest annoyance is clear skies but lots of wind, which doesn't do much for guiding at 3916 mm focal length
  2. Sale pending on black weight. Two white ones still available.
  3. I have three Skywatcher 5 kg counterweights - two white ones and one black. They were all used with my EQ6Pro, but fit other mounts as well (check bore size). The white weights have 18 mm diameter bores. The black weight has a 20 mm bore (I used all three with the EQ6Pro - I could tighten up the black weight without any problems and with no movement, but please be aware!) Condition is used - there are some paint chips and discoloured spots as seen on the photos, which show front/back views. £40 for the pair of white weights including UK mainland postage £22 for the black weight including UK mainland postage BLACK WEIGHT SALE PENDING or £55 for all three including UK mainland postage. Current new prices seem to be around £35-£39 each plus postage.
  4. Genuine Celestron dew shield for C11. Very little used, but some of the letters in the Celestron label have peeled off (see photos). £22 including UK postage.
  5. You'd need to enquire with Takahashi; this ABS archived post from 2012 is, I believe, an example of someone who did the same thing with their TOA 150, for the same reason: https://www.astrobuysell.com/uk/propview_archive.php?view=62886 Given the time since then I'd guess somewhere around £4000 with shipping etc.
  6. Please read the full description. This is a duplicate of the advert posted on Astro Buy Sell. For sale is my Takahashi TOA 150 refractor, fitted with the large (70 mm) illuminated finder, and Parallax Rings (not shown). Images taken with this telescope can be found on my Flickr astronomy album: https://flic.kr/s/aHsk148DDF Additional images *of* the telescope can be found in this Flickr album: https://flic.kr/s/aHsmHA1Cik As shown in some of the photos, the coating on the objective shows small spots, usually not obvious but they show up clearly under sunlight/daylight, which is when the close-up image of the lens was taken (ignore the BIG blue spots in lines - these are the reflection of my observatory lights!) The small spots have been caused by pollen grains being allowed to settle on the lens for an extended period of time - they break down releasing enzymes which etch the coating. It's a known issue, to which Taks seem particularly susceptible (search the web), especially if like me, you tend not to clean optics until "absolutely necessary". The spots are very small and though they look silvery in one of the images, they're transparent - it's reflection at the different refractive index boundary which makes them look the way they do. The total area occupied by the spots is tiny, and so the effect on image quality is very small indeed. The objective has been thoroughly and carefully cleaned with Baader Fluid and Purosol to ensure that there are no traces of the particles left, so this issue is not progressive. There are a couple of minor marks on the tube; the focuser is the A-type, and the shortcomings of that are well documented. I used it successfully for visual work, and then fitted a Lakeside focuser to it for imaging, at which point the shortcomings of the focuser design become largely irrelevant. The images on my web page were taken in this state, with the stock focuser and Lakeside autofocus. The Lakeside motor mounting bracket is included in the sale in case the next owner wants to go down the same route, but note that I'm not selling the motor or controller. I'm trying to price the 'scope realistically - a significant reduction on the typical used prices for this telescope to reflect the issue. The telescope will produce the classic Takahashi image quality now, and the future owner may choose to simply to use it as it stands. Of course, the cell can be returned to Takahashi for re-coating if desired, to restore it to an as-new objective. That doesn't come cheap - though adding the cost to the sale price still results in a total cost far below the price tag of a new TOA 150. The Parallax rings will need to be fixed to a dovetail plate (not included), and then it's ready to go. Metal aperture cover included as shown. There's also a cover for the 70 mm finder, though it is a very loose fit. I've been as open and honest in this listing as I can be - I'm trying to hide nothing, and questions are welcome. Price £4000, collection only from Braunston, Rutland (LE15 8QX). UPDATE - SOLD.
  7. NigeB

    M33

    Hello Everyone, Thanks for your positive comments! Kirkster, yes, I agree, I think there's more in there. I decided to back of a little bit - a lot of my images have suffered from processing noise, so I'm adopting a more cautious approach. But @wimvb provided some nice approaches to correcting this which I'm going to try. Olly, I agree, it's definitely green-heavy. I've tried a little SCNR noise reduction and some manual adjustments, but I've so far succeeded only in making the colours look even less natural... One of the reasons I've held off adding in the H-alpha is that I found it exacerbated the issue (I've read that taking OIII and adding that into the Green channel can help that). I'll have a go at re-processing to see if I can improve things. Thanks Nigel
  8. NigeB

    M33

    Evening All, I've been sitting on a set of M33 subs I took last October - finally got around to doing something with them. It's been a bit of a challenge, difficult to do a reasonable background subtraction when there's so much going on, and I've found colour calibration a bit of a problem. This is as close to "natural" as I've managed so far. I took some H-alpha frames, but haven't added them in yet. Exposure details: TOA-150 @ F/11 / Mesu 200 / Atix 460ex 10 minute sub-exposures L:R:G:B 47:15:15:14 Nigel
  9. Wow - that's a great image - your chuffedness is entirely deserved! Is that a cropped image or are you using the full frame? Those are really nice star shapes - that's a pretty large sensor and even so, the stars a nice and round across a really wide field. Nice!
  10. NOW SOLD - Thanks Graham These units were uninstalled from my Mesu 200 mount which has been reconfigured with a Sitech controller. Sale includes: - ServoCat Gen-3 unit - ServoCat hand controller - Argo Navis unit (Version 3.0.1 firmware) - Argo Navis cradle - Argo Navis Software Install + Instructions disk - Long (several metres) serial cable for PC control of ArgoNavis - ServoCat power lead (12V car cigar style plug on the supply side) No other wires, motors or encoders - you'll need to add these. ServoCat drives the encoders in both RA and DEC as well as receiving guiding information. Argo Navis acts as a stand alone controller (no PC needed). Both have been installed on a wide range of telescope mounts, large and small. For ServoCat see: http://www.stellarcat.com/Pages/servocat.html For Argo Navis see: https://www.wildcard-innovations.com.au This is a highly capable system costing upwards of £1200 new, and should be a good deal for someone who wants to add high precision, highly configurable go-to control to almost any kind of mount. The buyer will need some technical capability - it's not "plug and play", and you'll need to add motors, cabling etc - but there is information in the manuals (available online) to help. SOLD.
  11. Hi Tom, I have experience of only one autofocus solution - the Lakeside system which Ian King Imaging is the dealer for. I've fitted these on all my telescopes to date - C14, TOA150, C11 and Altair Wave 80. I find they work very well, including integration into SGP (there's an ASCOM driver). Lakeside provide the motor, mechanical connectors, control unit and mounting bracket - if there's not an off-the-shelf bracket already available for your chosen 'scope, they'll make one - all you do in this case is make a few simple measurements of your telescope focuser geometry, using a diagram which Ian King will provide. Other solutions available etc etc, but I've been very happy with my experience of Lakeside's offering. Regards Nigel
  12. Hi Feilimb I've had a quick look at your image, and you've definitely got some good data in there. I think a major issue is that you've not applied any flat field correction, which makes it much more difficult to process and extract the real signal. I had a quick go in PixInsight, just with a simple Automatic Background Extraction followed by some histogram stretch, and you can see the nebula clearly - but there's a lot of vignetting and other features which would be easily solved with flats. Others more skilled at gradient correction may get better results than I have (and I've not taken any care over balance - just a quick and dirty attempt to show the signal is in there - so it's a bit gaudy!) So my advice would be to keep doing what you're doing, but to make sure flats are part of your routine - they're really important. Regards Nigel
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