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johnturley

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About johnturley

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    Nebula

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    Dronfield, Derbyshire
  1. Astro Eclipse were again not very helpful when it came to vaccination requirements for the above trip, simply advising me to contact my GP. At the local medical centre there was some uncertainty, definitely tetanus, hepatitis, and typhoid were recommended, but the main uncertainty was relating to yellow fever and anti-malarial pills. The one country we are visiting where these might be a requirement is Bolivia, but if you are only visiting the high altitude regions around La Paz (which we are), it appears that these are NOT a requirement unless you are coming from an infected area or country, which includes parts of Brazil and the Iguazo Falls on the border between Argentina and Brazil. We are not visiting these locations on our itinerary, but others on different itineraries are. The yellow fever vaccination is only available at certain medical centres, and they are generally reluctant to give it unless absolutely essential, because some people have a very bad reaction to the vaccination, including the cancer specialist Dr Martin Gore, who unfortunately died shortly after having had a yellow fever vaccination. I wondered what is the understanding of the vaccination requirements of others who are travelling to South America for the trip, and what vaccinations they are having. In my opinion a company organising such a trip should take more responsibility to spell out what is a legal requirement for the countries visited on the trip, and what is recommended. John
  2. Last week week when there was a prominent sunspot group on the solar disc, this was easily visible through my Lunt 8 x 32 Sunoculars. John
  3. I had my post operative eye test at the opticians yesterday following on from my cataract operation, although I am still very slightly short sighted in my right eye (now -0.5 dioptre, previously -3.25), interestingly I now have zero astigmatism in this eye (previously + 1.25 dioptre), although I'm fairly certain that thery did not use a torric implant to specifically correct astigmatism. Having zero astigmatism in this my observing eye, may be another reason why the moon appeared so much sharper that it did before. The optician also said that the yellowish brown hue which I mentioned in my previous post is quite usual with ageing, normally you don't notice it as it tends to affect both eyes equally. John
  4. Did my first observing this last week following my cataract operation 3 weeks ago, mainly on the sun and the moon, the view through my right eye is now much sharper than it was before, and I can make out more detail. Interestingly whites now appear much whiter than they did before, and the view through my left eye (which I might require operating on at some point) in comparison displays a yellow-brownish hue, a bit like the old sepia photos you used to get. Unfortunately Taurus is now quite low down in the west before it gets properly dark, so can't really carry out two tests I was hoping to, of how many of the Pleiades I could see with the naked eye, and how easily I could see the crab nebula visually through my telescopes. Previously I could only just make out the crab nebula visually through my 14in reflector, and couldn't see it at all with my 127mm refractor, although light pollution is probably a more significant limiting factor. I still can't however make out the Mizar and Alcor double with the naked eye, which I used to find quite easy in my youth, and when I could also make out 8 of the Pleiades, but skies were much less light polluted some 50 years ago. John
  5. My 14mm does not require any significant extra inward travel, so maybe there is some variation in production John
  6. I have a full set of the 82 degree Explore Scientific eyepieces with 1.25in barrel (14mm, 11mm, 8.8mm, 6.7mm, and 4.7mm), and fairly pleased with them as a whole, I find them to be a significant step up from the 60 degree Meade Series 5000 both in terms of the wider field and sharper definition. However I find the 11mm to be a bit of an odd man out in so much, while all the the others are approximately parfocal (focusing within about 1mm of each other), the 11mm focuses about 3-4 mm further out. This causes me some problems when using it with my 14in Newtonian to which I have fitted a Baader Steeltrack Diamond focuser, which has just 40mm of travel. I have positioned the focuser such that I can just reach focus with my Canon EOS 6D camera, and all the ES eyepieces apart from the 11mm then require about 38 mm of out focus from that point, but with the 11mm requiring an extra 3-4mm, I need either to use an extension tube, or not fully insert the eyepiece into the focuser. Is there any particular reason why the 11mm is different from the others, or have I possibly got a rogue specimen. John
  7. I finally got details of International Flights and times together with my final invoice on 22 March. Departure is now on the evening of 27 June, furthermore the cost has risen by about 10%, slightly less than the figure of 12% which was required if you wanted to cancel and get a full refund. John
  8. That's exactly what they said to me in December, and had my right eye done last week. John
  9. One issue I think, particularly if you have the operation under the NHS, is that there is very little discusssion (if any) about the various types of implants, and the advantages and disadvantages of each type. The attitude of the NHS appears to be very much of 'this is what is available', take it or leave it. John
  10. Ideally a mirror should be removed and immersed in water for cleaning, as I do about about once per annum with the mirror of my 14in Newtonian, trying to clean in situo will almost certainly leave smeary marks. If your mirrors can't easily be removed, then I would also advise don't try to clean them. John
  11. Hi Ron Sorry to hear about that, as I mentioned my original appointment was for for 15 March, only after I arrived at the treatment centre (and paid a £20 taxi fare to get there as you can't drive afterwards) did they tell me that the operation had been cancelled, supposedly due to a power cut in the operating theatre, allthough I suspect that the actual reason might have been staffing issues. Originally they offered me an alternative date of 17 April, some five weeks later, but then the next day they rang me back offering 21 March, probably due to a cancellation, so you might get yours done sooner. Good luck John
  12. Hi Carole They used some sort of anaesthetic gel on my eye, although uncomfortable I can assure you that the procedure is not painful. John
  13. Finally had the cataract operation on my right eye last Thursday (21 March), it had originally been scheduled for 15 March, but this got cancelled supposedly due to a power cut in the operating theatre at the treatment centre on that day. I had arrived there (by taxi as you can't drive afterwards), and had been waiting 15 minutes before being informed. The operation was not a particularly pleasant experience but not painful, one of the other patients described it as not being as bad as the dentist, although I wouldn’t quite agree with that. Immediately after the operation I could see distant objects through my right eye a bit clearer than before, but then my vision deteriorated for a time and I could see little other than blurs and flashes of purple light, about which I got quite worried. Fortunately after a few hours things started to improve, although there was still a halo of light around bright objects. By the following morning the vision through my right eye had improved dramatically, I could now see distant objects clearly and could still focus on objects down to about 50cm away, so don’t need glasses for a computer screen, but as anticipated, I am now more dependent on glasses for reading. The sensation was similar to having a contact lens (which I used to wear) permanently inserted in my right eye. Prior to developing the cataract I was just slightly short sighted in both eyes (about -1 dioptre), but subsequently became very short sighted in my right eye. Comparing the vision in my right to that in my left eye, in addition to distant objects being clearer, whites seem a lot brighter, and the view through my left now appears to have a slight brownish hue in comparison. I am therefore probably getting a much higher percentage of light transmission through the implant than in the natural lens in my left eye, so I am hoping that I will now be able to see fainter stars. As I mentioned previously they have inserted a mono focal (optimised for distant vision) implant, I did enquire about multifocal implants, but was told that they are not generally available on the NHS, and that if I wanted a multifocal implant, I would have to pay for the entire operation privately (elsewhere), and that it is not possible just to pay for the extra cost of the multifocal implant. Having read several articles on line, although some people do end up with both good distant and near vision with multifocal implants, more people have problems with the latter, in particular with car headlamps when driving at night, which is probably another reason besides costs why the NHS generally does not fund them. Incidentally so far at least (touchwood), although I’ve experienced slight discomfiture, I’ve experienced no pain whatsoever, this compares to my daughter who suffered quite a lot of pain after less drastic laser eye surgery. John
  14. Hi Lars Sorry about the late reply, but just noticed your post. We were on holiday in Tenerife the second week in September last year, were staying at the Spring Vulcano Hotel in Playa de Las Americas where we had stopped twice before. About 3 months beforehand we had booked a trip to visit the Mt Teide Solar Observatory on 13 September with Vulcano Teide (the Spanish Tour Operator) and had paid for this in advance. The trip was also to include an evening observing session through telescopes, and I was looking forward to seing Mars in particular, which was still quire close to the earth at the time, but was too low in the sky to get a good view from the UK. The company confirmed the day before, that we would be picked by coach at the bus stop by the Best Tenerife Hotel in Playa de Las Americas at 16.00. We waited by the bus stop from 15.40 to 17.30, but no coach ever turned up, we tried to ring the office of Volcano Teide, but just got a recorded message. I subsequently emailed them, and they finally replied to say that the trip had been cancelled due to bad weather conditions, and that they had tried to contact us earlier, but no phone call or email from them was ever received. I also dispute their claim relating to bad weather, although it had been a bit dusty the day before due to Saharan sand (known locally as the Calima), conditions had improved by the afternoon of the 13th, the sky cleared and it was sunny, the wind had died down, and before sunset the crescent moon and the summit of Mt Teide were clearly visible from Playa de Las Americas. Furthermore whilst we were waiting for their non-existent coach, two coaches pulled up at the bus stop for the Teide by Night trip, which was clearly running. We consider that Vulcano Teide had simply cancelled the trip for operational reasons, maybe insufficient people had booked the trip that day for it to be economic for them to run it, or maybe the Teide Cable Car (which we had not booked) was closed, and they planned to use the same pick up coach for this trip. May be they have a habit of cancelling trips at the last minute, and then blaming bad weather. John
  15. Life would be able to adapt to various concentrations of the above gases, only if there was a sudden change over a short period would it cause problems. John
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