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Alfredo Beltran

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About Alfredo Beltran

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    Star Forming

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    Male
  • Location
    Bogotá, Colombia
  1. Hi This is my version of the Whirlpool Galaxy M51, using the IDAS filter and taken with the ASI071 OSC. Telescope was a C925 EdgeHD at f10. Mount is a CEM60. Exposure: 4hr 50 min in total at unity gain (54 x 5 min). Full exposure details by clicking on the image. Thanks for watching! Regards, Alfredo
  2. Hi Thank you all for your comments. I upgraded the capture time in te original post. Full capture details are found on the link when clicking the image. I took the series of Ha images, then OII and finally SII with the OSC camera. After calibrating I extracted the red channel from Ha and SII images and one of the green channels from the OIII images (there are two because of the Bayer matrix RGGB). When stacking, I used drizzle 2x to recover original resolution. Since each image was stacked with one of every four pixels, 2x drizzle produces full resolution stacked images. I did that for each of the channels (Ha, OIII and SII). After that I combined the images assigning SII to red, Ha to green and OIII to blue (Hubble Palette). Then I processed the image as usual. All of the pre and post process was done with PixInsight. This is possible because the color sensor of this camera has higher QE than previous ones and also because has a very low read noise (key for narrow band as you know). Let me know if you have any other questions. Regards, Alfredo
  3. Hi This is my version of the Rosette nebula using the Hubble and taken with the ASI071 OSC camera. Telescope was a C925 EdgeHD with Hyperstar lens. Exposure time: 4hr 50 min in total at unity gain 2hr 00 min (24 x 5 min) Ha 1h 15 min (55 x 5 min) OIII 1hr 35 min (19 x 5 min) SII This setup is awesome. A few years ago such an image just could’ve been taken with a monochrome ccd. Regards, Alfredo
  4. Good! How does it perform now? Id like to buy one to use with my C925 EdgeHD and hyperstar (f2.3), for RGB and narrow band (yes with an OSC since I’ve done it successfully with that combo and the DSLR). It can be done drizzling the es channel. Alfredo
  5. Very, very nice image of the Iris Richard. Congratulations. I think the very low read noise and dark current of CMOS sensors let OSC Astro cameras to perform at very high levels now. The details in the dust are amazing. Is your camera the Pro version? Regards, Alfredo
  6. Hi Before the end of the year I want to share with you this image of IC 1848, also known as the Soul Nebula in Cassiopeia. I took this image in RGB with the IDAS D1 filter in RGB and the Baader Ha 7nm filter to enhance the nebula in the red channel. Total exposure was 5hr 16 min at f2.3 with a modified Canon T1i on a hyperstar lens and a C925 EdgeHD. Of that time, 2 hr 25 min (29 x 5 min) at ISO 1600 were for Ha, and 1 hr 51 min (57 x 3 min) at ISO 800 for the RGB image. Mount is an iOptron CEM60. Captured in SGP and completelly processed with Pixinsight. IC 1848 on Flickr Happy new year to you all! Best regards, Alfredo
  7. Adam I measured the parameters for my camera and published here, based on Craig Stark's article . For use it at f10, or narrow band, I've found the less read noise helps quite a lot. More than ISO 800. Regards, Alfredo
  8. Thank you very much Adam In fact I use ISO 1600 for narrow band at f2.3 or RGB at f10, because I've found it is the sweet spot because of the low read noise. For rgb at f2.3 I use ISO 800. Alfredo
  9. Thank you Ouroboros. Not really. It was because ISO 1600 has the less read noise for my camera, and thus I chose it to get the most possible detail on the image. Alfredo
  10. Thank you Mark Indeed we have sighting opportunities for both hemispheres. Alfredo
  11. Thank you Rodd. The C11 will be more than capable at f10. Worth to try. Regards Alfredo
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