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guillespiers

Members
  • Content Count

    125
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  • Last visited

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About guillespiers

  • Rank
    Star Forming

Contact Methods

  • Website URL
    www.astrofotoperu.com

Profile Information

  • Gender
    Male
  • Interests
    Astronomy, Photography, Astrophotography, Music, Running.
  • Location
    Lima - Peru
  1. Thanks a lot! I recently contacted Starizona and they´ve started trying some things before trying another adapter. I personally think this will a new adapter is the adecuate solution.
  2. These are some of my best shots from different places in Perú. Winter season here is excelent for deepsky shots, specially from the mountains, were light pollution is very low, the air is dry, and the altitud varies from 3000 to 4000 meters over sea level. Some of these shots were done with my old Celestron Nexstar 6SE and my first astrocamera, a ZWO ASI 174 MC color camera. My latest shots were done with my new telescope, a Celestron EDGE 8 HD and a CGEM mount. I bought a new cam too! A ZWO ASI 071, and recently a Hyperstar V4 lens. My milky way landscape shots where done with a Sony a7s, and 3 lenses: Samyang 14 mm, Samyang 50 mm, and Rokinon 85 mm. Hope you like them!
  3. Hi! I am having the exact same problem, the only difference is my hyperstar is v4, but the camera (ZWO 071 MC Cooled) and it´s backfocus are the same (17.5 mm). I´ve wasted hours trying to fix coma problems with this setup, but it´s impossible. I took some screenshots from my laptop last night to show how serious my problem is: https://wp.me/a6SKCz-1t8 As you may see, the star (sirius), is perfectly round in the middle, but distorts a lot on the edges. Coma points towards the center of the sensor, from any direction. This is why I´m assuming spacing is the problem. What should I do? How can I make sure I buy the correct spacer? Thanks a lot, glad you solved your problem!
  4. Hi everyone! I wonder if you could please help decide which would be my next OTA! I recently upgraded my Celestron Nexstar 6SE mount to a Celestron CGEM mount. I´ve been doing some planetary work with the old Nexstar 6SE, but now my main goal now is DSO. You can see some of my work in my blog: www.astrofotoperu.com One of the main problems with the alt-az mount was that long exposures were impossible. My personal record was 30 seconds, but from 100 shots, only 15 where usable. I know the CGEM mount will help a lot on doing DSO, and that depending on the OTA I choose, I would probably need an autoguider. The focal length range I´m looking for should be around 600 mm and 800 mm. My main camera will be a Sony a7s (unmodded) which is a full frame cam, but I´ve read that most scopes won´t take full advantage over a full frame sensor, and will only reach an APSC frame size. So, Are there any 600 mm to 800 mm OTA´s out there, that can help me use the full frame sensor? I must say that I would love a refractor, but I´m open to other choices... Thanks!
  5. Thanks a lot for your help Stu! I`ll be very carefull and try the weights!
  6. Thanks a lot Stu! And it´s cheaper! How can I add the weights to the mount legs? Are there any special accesories? Thanks!
  7. Hi everyone! I´m upgrading my gear to a Celestron CGEM equatorial mount. I´m sure many people here would say it´s a great mount! I have a problem related to Lima-Peru´s city latitude, which is below the mount´s latitude range (which is 15° - 70°). Lima city is at 12° latitude, any ideas on how to reach them with this mount? I read about this two alternatives: 1. Extending one of the tripod´s legs to tilt the mount a little bit, adding some weights on the other 2 tripod legs to avoid the telescope to fall... 2. Buying a wedge, which have 0° - 90° latitude range, and place the equatorial mount over it. What do you think? Thanks!
  8. Hi! Sorry for my late response! I left my post opened for a while, and when I pressed "post" I found like 10 more comments! I was refering to what Stub Mandrel said; trying to figure out if by using "50 mm" in the formula would help me get a magnification number, but this seems a little complex
  9. Thank you all for the info As being said, what about we use "50" in our calculations? Since we are not using any eyepiece in my question, will this be ok? 4500 FL / 50 = 90x
  10. Thanks a lot acey! That makes more sense And what about using only a telescope, a barlow lens, and a camera? (no eyepiece). Asuming I use a 3x barlow, I have 4500 mm of FL. How do I get the magnification number?
  11. Hi lauropb! You are right! Buy my question is related to distance, If 1500 FL / 25 mm = 60x magnification; this means that: 630,000,000 km / 60x = 10,500,000 km In other words, am I 10,500,000 km closer to Jupiter?
  12. Hi everyone! What is the "apparent travel in KM" that a person does by looking through a telescope? For example, If I were watching Jupiter with a 1500 mm focal length telescope, and a 25 mm eyepiece; how close am I getting to it in a KM scale? Consider Jupiter to be at an average distance of 630,000,000 km from Earth. Also, what will be the answer if I added a 3x barlow lens, but only use a camera (no eyepiece involved). How "close" am i getting to Jupiter to take that shot? Those are a silly questions, but I´m very curious! Thanks for your time, Guillermo
  13. Thanks everyone for your recomendations, i'll fully charge it every month then. Clear skies!
  14. Hi everybody, I just replaced my celestron powertank's battery with an exact model (12v 7ah). The original battery was completely dead, because I didnt recharge it frecuently. Now that I learned my lesson , do you have any recharge recomendations? I mean, if I don't have a chance to use the powertank, when should I recharge it again? 1 time every month in summer, and 1 time every 3 months in winter? Even if I didn't use it? Thanks!
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