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drjolo

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Everything posted by drjolo

  1. I am not current user of EQ6-R, but I have this mount some time ago for testing. What I liked much was very low PE - for my EQ6-R it was less than +- 6", and tracking error with guiding less than 1" (with 13kg setup on it). While it has the same load capability as NEQ6, I think the precision of worm drive has increased significantly (for my EQ6 I have PE above +-20"). You can find my full review of EQ6-R at http://astrojolo.com/gears/sky-watcher-eq6-r-review/
  2. I have found link to some useful calculators in my bookmarks, and also for CCD sampling http://www.wilmslowastro.com/software/formulae.htm#CCD_Sampling . For green light and 2.9um pixel it gives f/14.
  3. I also have this camera for planetary and lunar imaging. I am not an expert in this kind of imaging, but I was told and also read, that for this pixel size optimum sampling is at f/15. So maybe f/18 is a little bit too much, but also Jupiter now is far from perfect position in northern Europe, so it will be hard to get decent images this season I think If you have regular barlow (not powermate or other teleextender) you can decrease its magnification a little by shortening distance to sensor (if it can be done at all).
  4. I already made an order in OVIO and now waiting for shipping cost estimation. @Merlin66 - I have seen your site and also studied L200 construction - very nice job. I want to start with classic design and compact instrument to learn some skills in this area. Then I maybe go for Littrow design to reach higher resolution. Do you still manufacture Spectra-L200 kits?
  5. Thanks Eric! This is interesting one. And probably in the guide camera I could see the index of selected slit in the same time
  6. This is my first post, so hi to all! I started to build spectrograph. It will be pretty common solution - with 100mm collimator, 50mm camera lens and blazed reflective grating. However I stuck on the slit I would like to use reflective slit, so positioning and guiding will be convenient, however it looks that there is not much to choose. I found only 25um reflective photometric slit from Shelyak for 168EUR. Do you know any other sources? I need 25-30um slit.
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