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Everything posted by jcm

  1. Hi All, Will be there on Saturday ( with my daughter ). Looking forward to meeting the "FLO people". John
  2. jcm


    Wow! Great image. I assume you added Ha to the red channel? John
  3. M106 is a tricky object for a non modded DSLR camera. You have made a good attempt. Try working at 800 iso ( means slightly longer exposures ) and think about using the Astronomik CLS or IDAS light pollution filters. These darken the sky background and make the object more visible. John
  4. Thanks for the positive comments. Getting the RC scope collimated properly seems to have improved my images. John
  5. Boosted the colour a bit. John
  6. Last night ( 7th March) was clear enough to attempt some imaging though the clouds did roll in after midnight. Rather a lot of haze did not help matters so I chose M106 which was fairly high up and in the opposite direction to the Moon. Scope - 8" RC working a F5.6 Camera - Atik 460EX Mount - EQ8 7 X 8mins for each filter - Red, Green, Blue and Luminance John
  7. I think the 383L would be OK as it is that bit smaller than a DSLR sensor. 13.5 X 18.2 mm for 383L and 14.8 X 22.2 mm for DSLR John
  8. Hi, I have been focusing on a star about half way between the centre of the image and the corner. Not sure what the 2/3 rds technique is. The reducer to CCD distance was about 53/54mm a bit less than the 55/57mm that WO suggest.(digital calipers) The reducer does not cover a DSLR chip completely.( its not bad but stars in all corners are elongated slightly) John
  9. Just thought I would post a couple of images taken with the new WO 81GT. The focuser seems easily hold my Atik 460EX/filter Wheel/OAG. Still having a few problems with the reducer-CCD distance but I'm very close now to the optimum value. Both images were taken using a 0.8X focal teducer. 1. NGC 2244 (Rosette Neb) 5X8mins Ha and 5X8mins OIII - synthesised green channel. White stars - no time for RGB. 2. Horsehead and flame Neb 10 X 5mins Ha filter. Quick processing to get some results quickly. John
  10. Hi Steve, I do have all the necessary filters! I still need to do so more testing but with some clear skies I hope to get a fully calibrated/processed image soon. It may depend how long I "fiddle" with the reducer/chip distance. John
  11. I have mounted this scope on my 8"RC. Getting the reducer/flattener to the best position needed several attempts. I suppose this is only to be expected working at F4.7 - I think I have just about got it right (53/54mm to CCD chip)though it may still need a minor adjustment.(WO say 55 to 57) Last night ( 19th dec) I managed to get a few images though the GT81. It was murky, cold and a nearly full moon was up. I opted to test the scope on NGC2244. I took a series of images using my Atik 460EX ( + ha filter - to reduce moonlight) 1x3min , 1X5min , 1X 8min and 1 X 10min There was no problem
  12. Hi Steve, Thanks for taking the time to find the focuser thread size. John
  13. Does anybody know if the Esprit 100mm APO has a 68mm thread connection at the end of the focuser. I cannot use the field flattener because there is not enough back focus for my setup. I read somewhere that it had but I cannot find any other confirmation. John
  14. 52.5mm is not a lot of space! Going to measure my back focus - I need 54.5mm to fit in filter wheel + OAG +Atik 460EX I do have the TS 2" field flattener - which has more back space. PS Thanks FLO for the correction. John
  15. I did a quick test and managed a 3min exp without guiding. I need to do an accurate polar alignment. John
  16. This is my first go with the EQ8 and my re-collimated RC (I think the collimation is now very close to the optimal). I'm using EQMOD and PHD for guiding and this proved to be problem free. This is a brief test of the whole system. 8" RC working at F5.6 , Atik 460EX , Ha 5X 8mins , OIII 5 X 8mins , synthesised green channel John
  17. Nice looking scope. I'm thinking of getting the same one. I would be interested to know if anybody has any info about a focus motor that could be fitted or adapted. John
  18. Astronomics ( US astro dealer) state that the field flattener back focus for the 100mm Esprit APO is 69.8mm. John
  19. The 100mm F5.5 Esprit APO looks a very interesting telescope. Does anybody know if the 3" focuser has any screw threads available so equipment can be directly attached without using the 2" or 1.25" adapters? John
  20. Received my EQ8 this week. No problems fitting it to the obs pier. I cannot believe how easy it is to alter the altitude and azimuth settings compared to previous EQ mounts. Polar aligning is tonights task. John
  21. Most of the info about this mount is on the Australian website IceInSpace. Some members have received their EQ8 orders. Link - http://www.iceinspace.com.au/forum/showthread.php?t=108249
  22. Made this today. All I need is to order the thing that goes on top of it. John
  23. I am one step behind you Rob at the moment. Thinking of joining the EQ8 order queue! I have been following the Australian astro site ( IceInSpace) with interest. The news that they have got it working with EQMOD is a massive plus as far as I am concerned.
  24. Might have to leave the construction of the pillar ( green in the diagram) because this has to go through the mount base and the diagram does not have dimensions on it ( apart from it has to be less than 30mm tall). My plan is to build the adapter and order the mount after the summer holidays.
  25. I am going to use PTFE sheet. Not sure what thickness but I have ordered some 1mm thick sheet and will see if it is OK
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