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yong54321

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Everything posted by yong54321

  1. Hi i am doing similar afocal shot but on Jupitar. I am using iPhone 6 on DOB 8 but stacking for 60 shots using SaturnCam iOS app. I think you can see more if you use in your case.
  2. Beautiful. What power is the binocular?
  3. I have tried it but whether you can use its feature depends hugely on your android phone. Only some phone (more expensive) has manual control over iso, exposure etc. There another another app to check the camera capability.
  4. Thought I should write a very brief description on how I capture spiral arm of a galaxy with an iPhone and a small telescope. It will benefit other beginners like me who want to see his first galaxy in his telescope. It is natural that beginner goes from looking at the moon to saturn to deep sky objects with only a small telescope. It comes to me that choosing the right bright galaxy is very important. I would advise to start with M51, ngc2903 in leo, M66 and M83 if you live in the south. M83 is face on, pinwheel and spiral galaxy so it should be easy to identify. To be familiar with the position of the galaxy is very important. Galaxy is so dim that it is not visible to the eye in a small scope. At least for my case when I do not want to use a GOTO telescope. I do not want to wake up my children and neighbours as GOTO telescopes are noisy. This is the impression I get when I view YouTube videos of them. I use manual telescope Meade Mini 114mm. If you can use GOTO that will be the best. But again, I got the kick when I find the galaxy manually. I always start with a binocular 10x50 and skysafari. Once i find its location in the sky, i slowly bring my binocular view downward to the horizon. I note the point at the horizon. Eg a building. Then i use my telescope to start at the point in the horizon and slow move upwards to the galaxy. It takes 30 minutes to find the galaxy in the beginning. Have patient. With practice, it takes me a minute to find m83 and always bring a smile to my face. Using GOTO or manual telescope, you have to deal with field rotation. Often with a small 114mm telescope, the M83 spiral arm come to sight only after 5 min of long exposure. It takes only a min if you use a Dobsonian 8 inches. Since I am not using any tracking or EQ mount, I have to depend entirely on software to track and de-rotate the images. So if you get any app that can do long exposure, track the stars and align and stack the images, you should be able to see the galaxy structure. I use SpiralCam app which i wrote myself. And for manual telescope, the galaxy will float across the eyepiece view. You will not have this problem if you use a GOTO telescope or EQ mount with motor drive. So for every 1 min, I have to shift the telescope so that the galaxy comes back to view. As such, the software also needs to identify the stars and match them when they reappears again. One last thing, the timing needs to be right so that the galaxy is at the highest point in the sky. There are more sky glow near the horizon. So I only try to image when M83 is above 40 degree over here. I read somewhere online that you have to deal with sky glow if you want to see a galaxy. So the software has to calculate and substract the skyglow from the images. Note that i am trying to image in Singapore. A light polluted city. And that is all that I could think of now. It is fun and most people say it is not possible with phone to see a galaxy. Just to add that another option to see the galaxy fast and beautifully is to use specialise video camera but it needs tracking mount and a laptop in the field which I do not want. I want something easy and instant. Have lots of fun!
  5. Hi, manage to capture the subtle spiral arm of m83 using iphone 6 and 114mm manual telescope. It is exciting to see a galaxy (above the blue square in the image). The second photo is shot with iPhone 6 and Dobsonian 8" manual telescope. The spiral arm comes to sight in about a minute for 8" scope.
  6. Here is an image of M83 using 114mm telescope (450mm focal length and 18mm eyepiece) and iPhone 6. The spiral arm starts showing after 5 min exposure. The second image is on a Dob 8". The spiral arm comes to sight in about a minute. Thanks everyone for your helps.
  7. Hi To Knight of Clear Skies: Thank you very much! It is very wonderful to have someone like you in the forum. I have tried your suggestions on uploading to astrometry.net and crossfader to WWT. It really match a M83 spiral arm in the crossfader. So happy that I do not know what to write. Many thanks for introducing me these great astronomy websites. I will post to smartphone imaging when I can capture more M83. I see you have done some great work on Milky way. Just to share, I have also used similar method to image the Milky Way with iPhone. If you are interested, you can google MilkyCam iOS. Its result is nothing spectacular but it lets me see the milky way over here. And wish you good luck clear sky! And thanks again for your help. To rickwayne: Thanks very much for your encouragement. To quote "That way lies a rewarding, challenging, and very deep (no pun intended) hobby." I have asked myself, now that I have see a galaxy spiral arm, what is next? There is still many bugs. I do not always see the galaxy each time I try to image. But I do find it "natural" to keep working on it. You enjoy too! Thanks again. For anyone who is interested, here is a very recent short video of my setup running with a 114mm scope and iPhone 6. https://youtu.be/oeMnA4v2Ejc
  8. Hi and thanks. To David_London. Thanks for the great recommendations. I would certainly wish that you have reply earlier. It is very attractive to be able to see galaxy in 2-10s. If I know mini114 is able to see galaxy, I would have stop buying more telescope. I spend so much time looking online for security camera such as LN300 which are hardly existing now. I opt for analog camera (analog camera) as I do not want to work with laptop and telescope in the dark. And prefer something easy and light. In the end, I give up searching for them. Just visit EAA section and did see some great images. I did not order goto mount as I find them noisy (from youTube) and that would wake up my young children and neighbours (live in a tight apartment with small balcony). So I have actually order Polaris eq130 and will add on a motor drive later. Would consider again a goto if there is a quiet one being recommended. How is the ambient sound of AZGTI mount? To Knight of Clear Skies. Thanks for your kind words! The M83s in WWT does not really match what I have. I have found a M83 with less detail in https://medium.com/hipster-color-science/imaging-the-m83-galaxy-7701408f3299 (last enlarged photo in the link, did not paste here as I do not have the author's permission). As for your question, I am tracking manually on an alt-azimuth mount. The iOS app (software) tracks the stars as they "float" across the eyepiece view for about 30-60 seconds. Then I move the telescope so that the stars return to view. The app finds the stars, tracks them and starts stacking again. Thank you very much. Best regards Yong54321
  9. Hello Just to update my struggle... I manage to see the spiral arm with my 8" Dob and using iPhone as a camera. It is only a very subtle hint of the spiral arm of M83. So i wonder if i am seeing tge galaxy or just noise. Could anyone verify? It is at the lower left of the attached photo. Do note that I have use custom iOS app (my own programming) to do the tracking and stacking. It is a far cry from those beautiful DSLR images. Best regards yong54321
  10. Hi The-MathMog Thanks very much for your reply. Your information is very valuable to me. I will avoid getting a slt 130. I read that it is require to enter time and date each time you want to use it. Since my current goal is to see the galaxy spiral arm (should be possible only by CCD camera), I might just get a Meade Polaris eq130 with motor drive and uses a "security camera". Then, I can expect to see the spiral arm within 2 minutes? Please correct me if I am wrong here. The skywatcher 130pds seem be better and fits DSLR camera. Unfortunately, the telescope is not available in my country. Using an eq with DSLR will takes me a few hours to setup eq, capture long exposure, stack them in DSS and process them in photoshop. Don't think i can do it since I have small children. Base on what i see on youtube, learning to use eq alone will takes me months... sweat.. HI DaveS Thanks for your recommendation. The book is available for shipping internationally on firstlightoptics.com It seems to be highly recommended on the forum. Hi Knight of Clear Skies Thanks for the picture!
  11. Hi thanks The-MathMog. It is good to hear from your experience with slt 130. It is very valuable. There seems to be people using it for imaging. And seem to have a lot more with 150P on the astrobin. I have to go into imaging so that i can simply enjoy a galaxy at my location. I have not try a eq because i read about the alignment setup with polaris. How much time do you need to setup your Advance VX? i read newbie get frustrated with eq mount. And what is the weight of your complete setup with 150PDS and mount? They are certainly a winning combination. I might be walking to a nearby park to use it beside my apartment balcony. best Yongchong
  12. hi Olly and Carole Thank you very much for your advise. Look like I will need a tracking mount. I will start with goto telescope slt 130 or starnavigator 102 (which is better?) since 14" is out of my budget and space at home. I might get a risingcam which look more affortable than macllincam. Hopefully i will see a galaxy. And thanks again for your help. Regards Yong54321
  13. Hello As I am a beginner in astronomy, I would like to ask for help before I spend more money on buying more ineffective equipments. My hope is to see the spiral arm of a galaxy, not just the core. I start with meade mini 114 but I cannot see any galaxy. But with my camera 30 sec exposure, I manage to see just the core of M83. So I go on and buy a Dob 8". It turns out I still cannot see the spiral arms, only the core is available. My next step could be 1. buy video cam like macllincam. I read they can see thru light pollution and see galaxy in a few second. I am located in Singapore. Do anyone has any success with similar setup? 2. buy manual meade polaris eq130 telescope and do imaging so that i can see the spiral arms? Use the eq motor drive? 3. buy goto telescope alt/muz. Celestron SLT 130 or starnavigator NG 102. and do more stacking. Or need bigger aperture? 4. buy goto eq mount? This looks expensive. 5. Other solution that i am not aware of. Thanks for any comments and help. I do not know which way to turn and it seems like a long way before i can enjoy a galaxy... M83 is shown as a "star" near the northwest of the cross hair in my attached photo. regards yong54321
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