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johninderby

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Everything posted by johninderby

  1. Have you downloaded Sharpcap? Using proper imaging software will help a lot. https://forums.sharpcap.co.uk/viewtopic.php?t=1695
  2. Same as the Altair version. . https://www.harrisontelescopes.co.uk/acatalog/altair-starwave-f11ed.html
  3. The Vera Rubin Observatory 3,200 megapoxel camera. https://www.space.com/vera-rubin-observatory-record-breaking-first-photos.html Don't think it’s going to fit your WO Redcat 51.
  4. If the aperture remains the same it is the focal length that affects the amount of CA. If you change the aperture then that does effect the amount of CA as well. Further reading on the subject. http://www.maa.clell.de/Scholar/chromatic_aberration.html
  5. At least it won’t be hard to fix if it does either by fitting a pillar extension or a tall dovetail plate.
  6. Maybe? but not sure. Perhaps using a tall dovetail plate would move the OTA out enough to clear. https://www.firstlightoptics.com/adm-vixen-type-v-series/adm-vixen-type-dovetail-with-wide-top.html
  7. CA (chromatic aberation) or false colur becomes more of a problem the shorter the focal length with a achromat which is more important for lunar / planetary observing as you will be using higher magnifications. Not such a problem with DSOs at lower magnification.
  8. It all depends on your mount. Perhaps a pillar extender like this would give you the clearance? https://www.firstlightoptics.com/sky-watcher-mount-accessories/skywatcher-eq5heq5-extension-tube.html The shorter 102 is still a good scope but will have more CA but a wider fov.
  9. Think Bresser’s arrangements with Meade and Explore Scientific doesn’t let them compete in the US market and TS is a German telescope dealer so would need to set up a US distrubution centre to compete in the US narket so might not be worth it to them?
  10. A filter is a good idea but prefer a variable polarising filter. Really helps on Venus as well. https://www.firstlightoptics.com/moon-neutral-density-filters/astro-essentials-variable-polarising-moon-filter.html
  11. No JOC is only a part owner. Bresser is jointly owned by Mr. Rolf Bresser, Jinghua Optical + Electronics Co. Ltd. and Helmut Ebbert. Shares: Mr Rolf Bresser - 40% Jinghua Optical + Electronics - 40% Helmut Ebbert. - 20%
  12. Had a look and could only find the low end Bresser scopes in the US.
  13. It is in stock at Harrison thpugh. so still possible to get one in a few days. I have noticed some astro items being sold at nearly the new price.
  14. Will be keeping an eye on the eBay one. Who knows it might go cheap.
  15. Bresser had two lines of refractors. The ones with a basic focuser with plastic wheels and the better line with the all metal CNC R&P focusers. My focuser is totaly stock with the dual speed option.
  16. The eBay seller ia asking nearly full retail price for buy it now. Only 15 quid less than buying from Harrison Telescopes incl delivery. Depends what price it is bid up to. https://www.harrisontelescopes.co.uk/acatalog/bresser-messier-ar-127l-1200-hex-focus-optical-tube-assembly-4827120.html#SID=1683
  17. I too have found the SW 1.25” dielectric to be very good but the 2” not as good. Saw a comparison test and apparently the mirror in the two inch isn’t as smooth as it could be with a bit less contrast. I did try one and did find it not as good as a WO or Revelation. Did see one of the SW 2” go for £39.00 posted recently and at that price would consider it.
  18. Just a protective coating on the mirror and while it doesn’t itself mean a better mirror it is only used on a guality mirror.so dielectric has become synonymous with a quality duagonal.
  19. Perhaps worth putting in a bid on this. https://www.ebay.co.uk/itm/APM-2inch-dielectric-star-diagonal/124328078890?hash=item1cf287ee2a:g:4aIAAOSwZFNfVfn2
  20. Second hand Revelation 2” diags go for about 70 quid posted so worth waiting for. Also like the WO diag which is a similar price used. One will come up within a week or two usually.
  21. Unfortunately the Skywatcher diagonal isn’t the greatest, not terrible but there are better choices out there. Worth about 50 quid posted. The Revelation is a better quality one.
  22. While a 1.25” likethis would be good. https://www.harrisontelescopes.co.uk/acatalog/revelation-quartz-dielectric-diagonal-1.25.html#SID=566 The two inch version would of course allow using two inch eyepieces. https://www.harrisontelescopes.co.uk/acatalog/revelation-quartz-dielectric-diagonal-sct.html#SID=566 Revelation drags are very good buys for a quality diagonal. EDIT: Everyone seems to be out of stock of the Revelation 1.25” so this ia a good alternative. https://www.firstlightoptics.com/diagonals/stellamira-1-25-90-di-electric-diagonal.html
  23. Small newts / dobs are more likely to arrive still collimated and stay in coimation and should just need a minor adjustment..
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