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Merlin66

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Everything posted by Merlin66

  1. If you add to the Auxiliary mount option in PHD2, it obtains the mount position and uses that.
  2. You can re-use your previous PHD2 calibration without using pulse guiding - I do it most of the time.......using an ST-4 connection.
  3. AR 2750 and AR 2751 are now noted on Raben and show on the current GONG images....
  4. Hmmmm, That’s interesting. I use a ATiK 314L for image (spectrograph) acquisition, a Lodestar for guiding, JMI focuser and PHD2 guiding all under ASCOM. with CdC and EQMod - never seen an ASCOM error message !!!!
  5. Michael, 1 arc sec is 1 second of arc. A degree of arc has 60 min of arc, or 60 x 60 =3600 sec of arc. So you could say, 1 arc sec is 1/3600 of a degree = 0.000277 degree.
  6. Alternatives: You still need a camera control and image acquisition software - a cost effective solution is AstroArt http://www.msb-astroart.com/ A complete software for astrophotography: image processing, astrometry, photometry, camera and telescope control. All major cameras, telescopes, filter wheels and focusers are supported by Astroart. Updated plugins are released for free. For tweaking the images PaintShopPro https://www.paintshoppro.com/en/ has all the features of PS and most of the Plug-ins.
  7. Ben, May give you some flexibility over the final spacing when using an OAG.
  8. Ben, On SCT's where the focal length is very long and there's a possibility of the main mirror moving (slop...) during a lengthy exposure, it's very common to use an Off axis guider (OAG) set-up. This is positioned in the optical path, close to the imaging camera and diverts some of the incoming light to a fixed guide camera, hence any movement of the telescope optics can be compensated and achieve good guide results. Mounting a separate guide scope and camera relies on a good rigid mechanical mounting with no slack or sag during operation, and unfortunately may not fully compensate for any eventual mirror slop in the SCT. I use a reflective slit which acts like an OAG on my C11 @ f10 for guiding. I can effectively guide for as long as necessary - no issues, no drama. Hope this helps. https://www.firstlightoptics.com/blog/blog-53.html The above review of the OVL OAG is well worth reading.
  9. Louise, For the Spectra-L200 and others I've built, I got my mirrors from Knight Optical https://www.knightoptical.com/ The stainless screws came from Model Fixings http://www.modelfixings.co.uk/fixings.htm My springs we made for me by Airedale springs https://www.airedalesprings.co.uk/
  10. I use the same Carton 100 f13 objective on the digital spectroheliograph. Impressive performer.
  11. Nigella, Yeah, I agree. Soft and flowing is the look to strive for. You'll find ImgPPG is very capable....practise, practise........
  12. Onwards and Upwards....
  13. Louise, OVIO are the local French supplier, Jeulin sells their product outside Paris and France.
  14. Just checked the Jeulin site: https://en.jeulin.fr/simple-radial-slits-212076.html That's what your looking for.
  15. Louise, My mate Fulvio has noted in his Spec 600 write up (http://www.lightfrominfinity.org/Spec 600UP and Spec600 EVO/Spec 600 UP e Spec 600 EVO.pdf) ""However, the Ovio has recently been incorporated into the French firm Jeulin, so it will be necessary to contact this last company to acquire the multi-slit plate, that actually is sold in bundle with three others plates, that don’t have interest for our purposes, or in a kit of two slit plates.It will be necessary to ask the Company to sell the multi slit plate only. https://en.jeulin.fr/en-products/physics-chemistry/optics/optical-components-commonequipment. html""
  16. No, weiller’s CORONO software. A bit difficult on the iPad to find the link, but Google will have it. http://sweiller.free.fr/Softwares/Corono/corono.html
  17. Look at Corono to give a black disk to enhance your proms. Recommended.
  18. I use EQMOD on both my HEQ5 and NEQ6PRO with CdC and PHD2. I still use the ST-4 cable for guiding (C11@f10). Why? It works well for me, why change?
  19. I use an ASI 174 and ASI 1600 for solar imaging with my SM60/ED80, x2.5 PM. I work at Unity gain (174 = 189 gain, 1600 = 139 gain) and Gamma = 50. I never touch these again. Using the exposure I push to get the histogram up to around the 90% mark....... For proms, I leave the Gain and Gamma untouched but push the exposure to show the prom.....maybe, just maybe, for the fainter proms I'll push the Gain a few points......
  20. Matt, Well done, looking better.
  21. Matt, A bit over cooked...the actual surface is smoother and more flowing......ease off the wavelets and contrast. Just my 2c.
  22. The #7315 1.25” non rotating helical is $99.....
  23. The Borg 1.25” version of the helical focuser works well. I use it on PST mods, the Spectra-L200 and the spectroheliograph.
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