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johninderby

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Everything posted by johninderby

  1. And not to forget Thomas Harriot who beat Galileo to it. https://en.wikipedia.org/wiki/Thomas_Harriot
  2. I too liked the film. Not a great film but enjoyable never the less.
  3. An interesting read on the subject from 1904. Title: The "Canals" of Mars Authors: Payne, W. W. http://adsabs.harvard.edu/full/1904PA.....12..365P
  4. This new crop of zooms are remarkably good for the money. I would say the Hyperflex and clones are about 90% as good as the Baader if not better. Been testing the new Svbony 10 - 30 zoom and am very impressed. A really nice zoom to use. Used to have a Baader but now wouldn’t buy another one as it’s a big increase in price for not a huge improvement. Would love to have theLeica zoom though.
  5. Most use a polarising filter with a wedge although only a single filter is needed as the wedge acts as the other half of the variable polarising filter.
  6. The wedge does take the detail and contrast to the next level. A noticeable improvement although as mentioned the cost is a lot higher so like all things optical the the cost of improvement increases exponently. I use a Lacerta 2” wedge which is a very good performer.
  7. Did you fit this extra grub screw? I’ve fitted two of the upgrade knobs and both work perfectly withoit changing grub screws.
  8. No need to change the grub screws if you fit the extra grub screw on the upper part. Often not fitted as the supplied instructions aren’t very clear.
  9. Congratulations You have now mastered the black art of focuser knob upgrading.
  10. Or if you are realy desperate. Googling came upwith this. https://www.wattpad.com/256438176-book-of-spells-sunny-skies-spell
  11. I’ve noticed that the accuracy of CO varies across the country. In some areas it’s pretty accurate but for my area the BBC is far more accurate than CO. Wonder how many others find one or the other better in their area.
  12. Not far off but you need to move the drawtube in or out so that a circle touches the edge of the mirror all round when collimation is spot on.
  13. I think Bresser dobs are finaly getting established in the UK market. Before it was the SW dobs are cheaper so I’m going for the SW as they look similar and everyone knows them but now that there is more feedback and reports on SGL the Bressers are seen as a step up from the SW for a bit more money. Not that there is anything wrong with choosing a SW dob but there is now another option.
  14. The 6” dob has a more basic focuser than the 8” and 10” but looks OK.
  15. Usa a proper solar filter like these. https://www.firstlightoptics.com/solar-filters/baader-asbf-solar-filters-for-binoculars-and-camera-lenses-50mm-aperture.html
  16. Interesting thread on the subject. https://physics.stackexchange.com/questions/255947/how-do-laser-tape-measures-work
  17. Hmmmmmm.............. This thread made me think of this.
  18. Blending might be a better term but crash or colliision sounds better I suppose.
  19. Acutally there won’t be any crashing as galaxies are mostly empty space so will pass through each other and gravity will make them form one bigger galaxy.
  20. I think a lot has to do with personal experience with different brands. Had problems with an Altair camera so sent it back but zero problems with a couple of ZWO cameras so now I would buy ZWO over Altair. Find ZWO has better support than Altair in terms of drivers.
  21. Have had the pleasure of dealing with Ian a few times and he must the most helpful person out there.
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