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Grumpy Martian

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About Grumpy Martian

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    Sub Dwarf

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  • Location
    Cheshunt in Hertfordshire.
  1. Thanks for doing the maths John. It does rather put it into perspective.
  2. Good point. I have the 28mm 68 degree ES and Williams Optics 40mm.
  3. I have a 115mm Vixen refractor which has a focal ration of f7.8. Nothing wrong with this. It gives good views of the moon, planets and double stars. But I do enjoy general wide field star gazing aswell. I was thinking of getting a wide field telescope to complement the refractor. Perhaps a six inch f 5 Newtonian? My thoughts are that it would give a much wider field of view, plus brighter views. Or am I deceived into thinking that there would be that much difference to warrant the investment? What do you think .
  4. Many people will most likely be at work during the timing of this event. It would be differcult for them to take telescope, mount, filters etc. So I was thinking about binoculars. I understand that you can get white light solar filter pairs for binoculars. Would you see Mercury in 10 x 50 or 8 x 40 binoculars?
  5. Observed the last Mercury transit when we visited Minorca. I used an Opticron 75mm spotting telescope with a Seymour solar filter. Several hotel guests shared the view aswell.
  6. Thanks for this post Dave. I'v just ordered a pot to use on my Vixen refractor.
  7. Thanks for getting intouch Jon. They have gone I'm afraid. Regret not changing the ad. Martin
  8. I have been interested in a larger aperture Dobsonian recently. Perhaps a 12 inch diameter mirror. Thinking that it would be for widefield low power viewing. Also a more manageable shorter tube length. So F 4 or 4.5? What would I expect to see. How would it perform? Any comments, experience or advice. Up to now I have had it in my mind that smaller scopes are the better option as I get older. But I'm not going to continue entertaining these thoughts. I have an 8 inch which I keep in Dorset. If I were to upgrade, I may aswell go to 12 as 10 inch would not be a great improvement over the 8. But I would hate to not to have tried a larger scope.
  9. Over the last few years I have changed my telescopes for smaller, manageable size telescopes. But aperture Fever is knocking on the door. I have a lovely eight inch F4. 5 Newtonian which gives nice views. I was tempted buy a larger Newtonian. But tube length would be an issue perhaps. Last winter I looked at the Orion Nebula through a Celestron C 11. I thought that the view was fantastic. I know that the C11's are usually fork mounted and the combined weight would be too much for my liking. But I am thinking of the possibility of mounting a C11 on my Altair Sabre and counter weights for purely visual. Would this setup work? Any thoughts would be welcome.
  10. Once or twice in the past I have been interested in joining or forming an informal astronomy observing group in the A10 corridor of South East Hertfordshire. There are some nice dark sky sites only a few miles north of the M25 motorway. I would be interested to hear from anyone that shares my interest. Martin.
  11. Are you pleased with the peformance of your Vixen ED115S ? I have to say yes. Saturn always looks sharp and some detail revealed in atmosphere markings. This is in light polluted skies. Also the tube weight is light for it's size.
  12. I have the Vixen ED 115S refractor. The optics are described as Extra Low Dispersion Optics. I am interested to know which type of glass is used to make the doublet objective. In the past I have owned several Skywatcher refractors with FPL 53 glass. These gave really good, pleasing views. I know that Takahashi refractors use fluorite to make the objective. Also Explore Scientific refractors use a different glass. The views from the Vixen are very good.
  13. Judging by the great deal of interest shown this afternoon when FLO anounced the new Alt-Az mount the observers are still keen. Is there a link to the new alt/az mount? I am purely an observer. While restricted to brighter objects here on the outskirts of light polluted North London. I long for my frequent visits to the darker skies of Dorset.
  14. Hope you enjoy SGL. Welcome.
  15. Search on the Web for a diagram of an achromatic doublet refract objective. It will give you an idea of the crown and flint lenses positions. When they are positioned you can the rotate one lens until the image is at it's best. This is the sweet spot.
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