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About Astrofriend

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    Star Forming

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  1. Hi Rusted, D-ERF filter was something new to me, googled and found this: https://www.baader-planetarium.com/en/baader-d-erf-energy-rejection-filter-(75---180mm).html Very advanced, it reminds me about a friend, Jörgen Blom that every day did his drawings of the Sunspots. Maybe more than 25 years, he past away for seven years ago. Found this article, sorry, only Swedish: http://www.popularastronomi.se/wp-content/uploads/2012/06/2006_3_blom_ogon_pa_solen.pdf Maybe you find my teacher Göran's Debris finder interesting: http://www.astrofriend.eu/astronomy/astronomy-articles/debris-finder/debris-finder.html /Lars
  2. Hi Rusted, I wasn't aware of that situation, the equations behind are simple but in this case I they should work even for longer distances. You can always overide the limits, just type in the figures direct in the window. I added that text in the beginning, thanks for the information. It sounds like that your are doing exiting things ! /Lars
  3. A friend ask me about filter size, I already had a Excel sheet with that calculation. But I did a new web calculator. It's the first version but it looks to calculate it correct, have a look: http://www.astrofriend.eu/astronomy/astronomy-calculations/minimize-vignetting/minimize-vignetting.html It's not any high precision calculation, but gives knowledge enough I think. Too small filter gives vignetting, too big filter empty the wallet. /Lars
  4. Here are some examples from old astrophotos I have taken with different equipment. TS130 APO f/7 Pentax 500 mm f/4.5 Pentax 67 f/2.8 Canon 6D Canon 5D (Mk I) The object is the open cluster M44, Beehive: http://www.astrofriend.eu/astronomy/astronomy-photo/open-clusters/m44/m44-open-cluster.html /Lars
  5. Hi Dave, Yes I can rotate the Canon raw files with Canon software, but can I store the new rotation in the .cr2 file with that software ? It's only a windows software I think and it can only handle Canon raw files. It was many years since I had that Canon software installed, but there was some problem with it that I don't remeber now. /Lars
  6. Sometimes you have problems that you can't find solutions to and you push it to the future how to solve it. In my data there are photos I took already in 2013 that I accidentally had the camera's auto rotation turned on. As a result, as the mount moved during the night, the orientation of some of the photos changed. Since then I have tried to change the rotation so that all of the raw photos will be back to a horizontal orientation again which many of the astro software require. Changing the orientation is easy in most software, but to save them in Canon's .cr2 format again I never found a solution to until now. Here's how I solved it: http://www.astrofriend.eu/astronomy/tutorials/tutorial-rotate-raw-files/01-tutorial-rotate-raw-files.html I have only done this on Canon's .cr2 files. Let me know if you can use this for other cameras, Nikon, Sony etc. You have at least to change the file extension inside the batch file. /Lars
  7. After a long delay I could do some test of the modified EQ6 mount with the new belt drive. I use PHD2 but have not optimized the parameters yet, even that I could get a tot rms error of 0.69" I have some screen dump with graphs here: http://www.astrofriend.eu/astronomy/projects/project-eq6-dismantling-rebuilding/18-eq6-dismantling-rebuilding.html I'm not sure if the EQMOD and PHD2 is at its optimum setup, earlier I had an off-axis adapter and I got less tot rms error but the field was very limited. /Lars
  8. Hi Steve, Interesting with your photometry of NGC957. Will you publish the data somewhere? I have added more information of how Gaia data can be used. Plots of velocity and position, more will added in the future. In the learning process to do more advanced things later. http://www.astrofriend.eu/astronomy/science-data/gaia/05-gaia-position-stars.html Happy New Year ! /Lars
  9. Hi, I use a 90 degree angled viewer and for me who live at 60 latitude it's an enormus difference. I have it written down here: http://www.astrofriend.eu/astronomy/projects/project-star-adventurer-angled-viewfinder/project-star-adventurer-angled-viewfinder.html The viewer FLO have looks to be the same as I have, but with included adapter, my plan is to 3D print the adapter later. /Lars
  10. It's hopeless in Sweden where I live, rain and rain and clouds. I have to do something about it. I have already earlier used some data from astronomy data archives. Now I start with a new satellite, the Gaia astrometry satellite. It doesn't have images, it has astrometry data. There are a lot of interesting things that can be done with these data. But first I have to learn how to extrat the data from the archive and how to process it. I have written down how I do it and can be used as a tutorial for you who find it interesting. Here it is on my homepage: http://www.astrofriend.eu/astronomy/science-data/science-data-gaia.html My first calculation is a HM-diagram of the stars close to the Sun. Hope you find it as much interesting as I do. /Lars
  11. Hi, Sorry, I updated the tutorial today, but didn't add new pages, added it on the pages that was already there. http://www.astrofriend.eu/astronomy/tutorials/tutorial-setup-off-axis-adapter/01-tutorial-setup-off-axis-adapter.html I don't use the off-axis adapter anymore that you see in the examples. I need a new bigger off-axis adapter. Maybe I built that in the future, it could be built around this: https://www.teleskop-express.de/shop/product_info.php/info/p6544_TS-Optics-Off-Axis-Guider-with-ZEISS-M68x1-connection---short-design.html But all the adapters needed to it will cost some money, so I wait. Until then I have to going back to a separate guide telescope. You can see it on these pages: http://www.astrofriend.eu/astronomy/projects/project-three-inch-flattener/project-three-inch-flattener.html Do you have plans to implement an off-axis adapter ? /Lars
  12. Hi, When you for the first time setup an off-axis adapter it can be confusing, at least it was for me. I have written down a tutorial that maybe can be of some help: http://www.astrofriend.eu/astronomy/tutorials/tutorial-setup-off-axis-adapter/01-tutorial-setup-off-axis-adapter.html I will edit and do some complement in the text later. A question to all you that already have an off-axis adapter, what make and model do you have ? Are you satisfaid with it ? /Lars
  13. Now at last, I could power up the EQ6 mount again. Really exiting to do this first test. One important thing was to setup the EQMOD with custom gear ratios, never done it before. It looks to work with the indoors test I did. Here it is: http://www.astrofriend.eu/astronomy/projects/project-eq6-dismantling-rebuilding/13-eq6-dismantling-rebuilding.html To my surprise the sound / noise was almost as high as before. Maybe others with standard spur gear has very high noise. I hope we get a clear sky soon so I can do real test. /Lars
  14. The mount is now assembled again and I can start to do some test and adjustings. I noticed that I had some friction when the clutches where open, didn't expect that. After some examination and test I found what happens in the mount and cause the friction. It's only when the cluthes are open I have friction. When closed and tracking it rotates with the two other roller bearings and then it's almost no friction. Good! Some photos from when I testing this: http://www.astrofriend.eu/astronomy/projects/project-eq6-dismantling-rebuilding/12-eq6-dismantling-rebuilding.html For me it had been better without these clutches, less complicated and more compact, save some kg also. If I ever build my own mount it shall not have any clutches and no gearboxes. It shall have direct driven 3-phases DC motors. For the moment only a dream. Until then I collect information: http://www.astrofriend.eu/links/links-astronomy-directdrivemount.html /Lars
  15. Today I have assembling more items on the EQ6 mount. I have measure the needed thickness of the RA and DEC shafts shims. I also checked if the length of the timing belts are correct, almost but have to do some modifications of the brackets for the stepper motors. Here is photo and info of todays work on the EQ6 mount: http://www.astrofriend.eu/astronomy/projects/project-eq6-dismantling-rebuilding/08-eq6-dismantling-rebuilding.html /Lars
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