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About Davei

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    West Sussex
  1. Yes its very good; totally secure and easy to change attachments. But the SCT focus issues got to me and so replaced it with Baader Steeltrack crayford which is great; even better now I have fitted a Lakeside motor to the C11.
  2. There are a few of the Celestron Edge promo offers still around. Eg C11 Edge for £2.3k. At that price it seemed good vfm. On my first viewing it's great; lovely views of Saturn & Mars. Re: Olly's comments, I shall still use my WO refracter for DSO's.
  3. I don't have a field flattener for the Megrez 90 and haven't seen the need so far. I'm pleased with the Astronomik 11/4 inch filters but you need a lot more budget for the 2 inch ones!
  4. I'm using an SXV-H9 with the Megrez90 & SX Filter Wheel with 1.25ins filters, LRGB, Ha, Hb & OIII). The H9 has amazing sensitivity but multi-spectral imaging takes a long time and I wonder if One Shot Colour CCD's are now getting as good as monchrome.
  5. Helen, I have recently installed the LakesideAstro focuser to my Megrez 90 and I am very impressed with it. I can focus far more accurately than I ever could manually, e.g. fine focus as filters change. The motor attaches in place of the coarse focus knob. I have attached a few photos of the installed focuser for info. I can recommend it. regards dave
  6. Jon, On my obsy, admittedly a bit smaller than yours at 7 x 7ft, I offset the pier to the South by 15% to make more room for observing. And been glad of it. Just another thought! dave
  7. I don't know the production cost because for me it included designing and constructing the mold, laying up the fibreglass and core and quite a bit of tinkering around. For example we changed the final gel coat to one with a high wax content to stop lichen growing on the roof through our southern winter. However, none of it is difficult and it should be do-able as a home job in a few weeks.
  8. John, I'll scan my drawings and e-mail them to you but if you want to change the dimensions you may want to contact Norman and he can re-run the design on his Autocad (but he may charge).
  9. John, the roof weights 215 lbs. Lighter would be better since the counterweights could then be reduced. However, it has 2 flanges on each side to secure the pivot arms and a 6 inch flange on both North & South sides to stop the rain from coming in under the roof. They give it rigidity but also some extra weight. I would guess that aluminium lined with insulation would be a lot lighter. You could make the pivot arms out of welded Al tubing with plates welded where the bearings and counterweights are fitted. They could be secured by bolts to welded flanges on the inside of the roof.
  10. Thanks guys for your comments. The roof was molded in fibgerglass with a 2 inch thick foam core. It had flanges molded into each side for the pivot arms. The final gel coat on the outside had special wax content so that lichen hopefully won't grow on it. The inside surface has a white gel coat so that I can use it for Flat Field calibration shots. The mold construction is shown on the attached pic. It was pretty big for only a 7 x 7ft roof. I had it made by a company that makes figreglass swimming pools.
  11. Digz, the pics were posted yesterday in a seperate thread once I'd figured out the attachement process!
  12. The issue for me was height. I believe that to avoid planning permission it needs to be less than 3m high, even though it was some way from the road and house.
  13. Re: construction. I had the roof and building made for me and I made the Pivot Arms which proved too complex for my shed manufacturer! I then assembled it with help from Norman Walker who did all the detailed Autocad design. dave
  14. Euan, Yes the fibreglass roof has rain water gutters molded into it at the East & West ends. dave
  15. Thanks all for the comments. The roof/pivot arm assembly has fairly high inertia plus a degree of in-built friction because I did not want it running out of control once it starts to rotate. So it needs an amount of arm power to get it moving and then to stop it. Hence the winch for my wife to use and rubber buffer pads on the concrete base to stop the roof as it reaches 90 deg. Yes there are 2 sets of counterweights, one on each arm. I have fitted removeable safety pins in each Pivot arm so that when the roof is in place it's locked against hurricanes, small kids etc. dave
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