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From the album: Deep Sky Imaging
This image of Rho Ophiuchus/Antares region was imaged with a QHY268M and a Sigma 150mm prime lens on the nights between 21-23 June 2022. The total integration time was 8 hours and 42 minutes of subs, 31 subs each of 60, 120 and 180 second for Luminance, and 60 x 60 second subs for the red channel, 60 x 120 second subs for the green channel and 52 x 180 second subs for the blue channel. Object name: Rho Ophiuchi Cloud Complex Constellation: Ophiuchus Object ID: p Ophiuchi Coordinates: RA: 16h31m24.337s, DEC: -25°14’28.424” Apparent FOV/Radius: 8.46° x 5.64° (507.6 x 338.4 arc-min) / 5.084° FOV Angle: 173° E of N Object Apparent Dimensions: 6.5° x 4.5° Exposure Date: 21-23 June 2022 Distance: 360±40 LY Magnitude: 4.63 Exposures: L:31x60s, 31x120s & 31x180s @ FW:31 & R:60x60s, G:60x120s, B:52x180s @ HCG:62/OFS:25 (8h42m) Telescope: Sigma 150mm EX f2.8 Lens Imaging Focal length: 150mm Plate Solved Focal length: 147.72mm Camera: QHY268M -10°C BIN1x1 Resolution: 5.25”/px Guiding: BOSMA BetaRE, ZWO ASI120MM mini, PHD2 Guiding Mount: CGEM-HT- 1 comment
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From the album: Deep Sky Imaging
The Antennae Galaxies ( NGC 4038/NGC 4039) are a pair of interacting galaxies in the constellation Corvus. They are currently going through a starburst phase, in which the collision of clouds of gas and dust, with entangled magnetic fields, causes rapid star formation. Imaged using a 8" SCT (at the native 2032mm focal length), with a QHY268M camera. The total exposure time of this image for all of the LRGB filters was 5 hours and 9 minutes. Exposures: L:15x600s @ FW:31, R:17x120s G:15x180s B:16x300s @ HCG:62/OFS:25© Mariusz Goralski
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From the album: Deep Sky Imaging
The Eagle nebula (M16/NGC6611) in the constellation Serpens exposed through narrowband filters at Hα, OIII and Hβ wavelengths to emulate natural colors as those narrowband wavelengths are closely corresponding to the RGB wide band. This image was taken with a 8" SCT (at the native 2032mm focal length), with a QHY268M camera and tracked using a "hypertuned" CGEM mount. The total exposure time of this image was 12 hours and 45 minutes. Exposures: Hα:17x600s, OIII:17x900s, Hβ:17x1200s @ HCG:62/OFS:25 The color channel assignments are HAlpha, OIII and HBeta as RGB.© Mariusz Goralski
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From the album: Deep Sky Imaging
The Sombrero Galaxy, also known as M104 or NGC 4594, is a spiral galaxy in the constellation Virgo located 31 million LY from Earth. The galaxy has a diameter of approximately 50,000 light-years), a third of the size of the Milky Way. It has a bright nucleus, an unusually large central bulge, and a prominent dust lane in its inclined disk. The dark dust lane and the bulge give this galaxy the appearance of a sombrero. Imaged using a 8" SCT (at the native 2032mm focal length), with a QHY268M camera on a hypertuned CGEM mount. The total exposure time of this image for all of the LRGB filters was 6 hours and 14 minutes. Exposures: L:17x600s & 15x300s @ FW:31, R:14x120s, G:12x180s, B:13x300s @ HCG:62/OFS:25© Mariusz Goralski
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From the album: Deep Sky Imaging
Omega Centauri (NGC 5139) is a globular cluster in the constellation Centaurus. Located at a distance of 15,800 light-years, it is the largest globular cluster in the Milky Way at a diameter of roughly 150 light-years. It is estimated to contain approximately 10 million stars, totalling the equivalent of 4 million solar masses. This photo was imaged using a Celestron C8 and a QHY268M at the native 2032mm focal length. This very bright object was exposed for only 78 minutes, 14x180sec subs through a UV & IR Cut filter and 12 x 60s subs through each of the red, green and blue filters.© Mariusz Goralski
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From the album: Deep Sky Imaging
Centaurus A (NGC 5128) is a galaxy in the constellation of Centaurus 13 million lightyears away. NGC 5128 is one of the closest radio galaxies to Earth and is also the fifth-brightest in the sky, making it an ideal amateur astronomy target. The galaxy is only visible from below very low northern latitudes but is best seen or imaged from the southern hemisphere. This photo was imaged using a Celestron C8 and a QHY268M at the native 2032mm focal length. This object was exposed for 3 hours and 56 minutes, 16x600sec luminance subs through a UV/IR rejection filter and 6x120s red, 8x180s green and 8x300s blue filters.© Mariusz Goralski
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From the album: Deep Sky Imaging
The Hamburger Galaxy, not my best image as it's quite low in the northern sky from my location and I was exposing while shooting over house roofs which, no doubt, caused thermal currents and destabilised the star and object light. NGC 3628 is a unbarred spiral galaxy, located about 35 million light-years away in the constellation Leo. Along with M65 and M66, NGC 3628 forms the Leo Triplet, a small group of galaxies. Its most conspicuous feature is the broad and obscuring band of dust located along the outer edge of its spiral arms, roughly resembling meat between bread rolls and giving it the nickname "The Hamburger Galaxy". This image was exposed across two nights, 3 & 4 April 2022, using a QHY268M through a Celestron C8" SCT at the native 2032mm focal length, tracked on a Hypertuned CGEM mount. Total exposure time was 6 hours and 23 minutes through all LRGB filters.© Mariusz Goralski
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From the album: Deep Sky Imaging
The Pencil Nebula, NGC 2736, is a part of the Vela Supernova Remnant, near the Vela Pulsar in the constellation Vela, about 815 light-years away. This images total exposure time was 9 hours and 50 minutes, consisting of 13 x 600 second H-Alpha, 12 x 900 second OIII and 14 x 1200 second H-Beta 7nm narrowband channels. Taken through a 80mm Refractor @ f6.25, on a hypertuned CGEM mount with QHY268M camera.© Mariusz Goralski
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From the album: Deep Sky Imaging
The Dolphin Head Nebula, Sh2-308 (RCW11 & LBN1052), is a bubble of gas expelled from the star EZ Canis Majoris in the constellation "Canis Major". This image was exposed in HAlpha, OIII and HBeta narrowband color. This photo consists of 12x600s Hα, OIII:12x900s OIII and 11x1200s Hβ at High Control Gain of 62 and an offset of 25. Taken from a semi rural (Bortle 4-5) sky through a 80mm Refractor @ f6.25, on a hypertuned CGEM mount with QHY268M camera for a total exposure time of 8 hours and 40 minutes. Object name: Dolphin/Gourd Nebula Object ID: Sh2-308 (RCW11 & LBN1052) Constellation: Canis Major Coordinates: RA: 06h54m15.88s, DEC: -23°48’44.70” (star Central: EZ CMa/WR 6 & Orange: O1CMa) Distance: 4530 LY Magnitude: 7.0 Exposure Date: 09 - 13 March 2022© Mariusz Goralski
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From the album: Deep Sky Imaging
The Rosette Nebula is a large spherical Hydrogen Alpha region located in the constellation Monoceros. The cluster and nebula lie at a distance of some 5,000 light-years from Earth and is roughly 130 light years in diameter. The open cluster NGC 2244 is closely associated with the nebulosity being the stars of the cluster which have been formed from the nebula's matter. The complex has the following NGC designations: NGC 2237 – Part of the nebulous region (Also used to denote whole nebula) NGC 2238, NGC 2239 & NGC 2246 – Part of the nebulous region NGC 2244 – The open cluster within the nebula This images total exposure time was 7 hours and 40 minutes, consisting of 15 x 600 second 7nm narrowband H-Alpha subs for the luminance channel and 15 x 180 second red, 15 x 300 second green and 19 x 600 second blue subs for the color data... color data was exposed during a full moon. Taken through a 80mm Refractor @ f6.25, on a hypertuned CGEM mount with QHY268M camera.© Mariusz Goralski
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Eridanus "Eye of God" Galaxy - NGC1232 _ 14-31 Dec2021 HaLRGB
MarsG76 posted a gallery image in Member's Album
From the album: Deep Sky Imaging
NGC 1232 is an intermediate spiral galaxy about 60 million light-years away in the constellation Eridanus, sometimes refered to as the "Eye of God" galaxy. NGC 1232 and its satellite are part of the Eridanus cluster of galaxies, along with NGC 1300 which I imaged a couple of months ago. Imaged in Ha & LRGB with a QHY268M camera, through a C8 SCT at 2032mm focal length, tracked on a CGEM mount for a total exposure time of 10 hours and 5 minutes.© Mariusz Goralski
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From the album: Deep Sky Imaging
NGC 1512 is a Barred Spiral galaxy, 38 million light years away in the constellation Horologuim. The galaxy displays a double ring structure with one ring outside on the main disc and another surrounding the galactic nucleus. The galaxy shape is unusual with several faint loose spiral arms photographically revealed like they are flung away from the galaxy, but this is the result of NGC1512 being in the process of merging with NGC1510, a near by lenticular galaxy, causing tidal distortion of the outside spiral arms. Imaged in Ha & LRGB with a QHY268M camera, through a C8 SCT at 2032mm focal length, tracked on a CGEM mount for a total exposure time of 12 hours and 5 minutes.© Mariusz Goralski
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astrophotography Prime focus with skywatcher 130p
Pincs posted a topic in Getting Started With Imaging
Hi I'm thinking about buying a SKYWATCHER EXPLORER 130P SYNSCAN AZ GOTO TELESCOPE for astrophotography but I've heard that prime focus is not possible without modifications. Could I use an extention tube with my DSLR to fix this? Thanks. Pincs -
I am in the process of setting up an astrophotography and imaging group just outside Filey in North Yorkshire. Having recently taken delivery of an observatory together with a fixed pier and currently awaiting a quote for the concrete plinth. I am hoping to break ground next month with the observatory being "functional" by the Summer. Please note this will NOT be a visual astronomy group as such and instead, will primarily be for astrophotography with the intent of learning and sharing techniques together. Lots of work ahead and this post is more of a "feeler" to discover nearby interest. I met a wonderful chap in Bridlington around 3 years ago having bought a dual saddle from him but sadly, cannot remember his name or exact location as a hard drive crash meant I lost all contact details. It is knowing someone like this relatively close by who could assist with the "little things" like EQMod, oversee the pier placement (before I cement the bolts in incorrectly), drift alignment .... ie someone who has already been through the initial stages. My end goal will be one of fully remoting the observatory and this may even progress to remote sessions over the internet. I do like a good challenge I will be charting progress in a blog on my homepage. Best wishes, Steve ps with huge thanks to York Astronomical Society for their help and advise getting me this far
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Well, after struggling for a few years in a fairly light polluted area I have moved to the edge of Dalby Forest just outside Scarborough and the sky's are just magical. A shame my neighbour has a security light that is permanently on as soon as a hint of darkness approaches - I offered to buy him a PIR operated one but - it is a touchy subject so best left alone ! Anyway, just laid a concrete plinth and trimmed some top branches. Clear view to Polaris north and an uninterrupted southern view which is great. I have just set up an Astronomy Imaging UK group on Facebook which is a sister group to our Aurora UK group - two groups worth joining ;) Hope to post more soon. Steve
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Below is a comparison between single dark frames taken with the Nikon D7500 and D5300 with exposure durations varying from 1 sec to 240 sec ( my usual main light frame exposure ) all at ISO400. Firstly a graph of the standard deviation of the noise in the dark frames versus exposure time: The standard deviation of the noise is a fairly constant 2 ADU less for the D7500 compared to the D5300 ( pretty much the difference in the read noise between the two ) However, the difference is not just in absolute terms but also in the quality of the noise ... Below are the dark frames - ranging from 240 sec exposures at the top to 1 sec at the bottom: D7500 D5300 The D5300 dark frames clearly show the pattern in the read noise ( banding down the bottom ) and also have far more chrominance noise compared to the D7500. At 240 seconds ( the main exposure I have been using ) the difference is starkly different; the D7500 produces images with much lower noise that is significantly more even and random and hence more likely to be reduced during integration. -
The Nikon D5300 has a well-earned reputation as one of the lowest noise DSLR cameras used for Astrophotography. Now that I have a new Nikon D7500, I was keen to see how it compared to the D5300 in terms of the level of read noise and the extent to which that read noise is non-random ( and thus needs to be removed using a Master Bias frame to prevent it summing up during image integration). So here goes ... ......... A single bias frame Nikon D5300: ISO400, 1/4000th second: This may look pretty bad but really the extreme stretch is bringing out the very small variations across the frame: Standard Deviation: 3.53 ADU ( note: in this context, 3.53 ADU means 3.53 "units" on a real number scale ranging from 0 to 16,383 ( ie. a real conversion of a 14 bit digital scale )) The master bias frame looks like this: Nikon D5300: ISO400, 1000 x 1/4000th sec frames Standard deviation: 0.48 ADU The bands at the bottom are each 1 ADU brighter than the one above. Now for the D7500 ... A single bias frame from the Nikon D7500: ISO400, 1/4000th second: It is immediately clear that the single bias frame is cleaner. The statistics confirm this: Standard Deviation: 1.37 ADU And the master bias ... Nikon D7500: ISO400, 1000 x 1/4000th sec frame Standard deviation: 0.07 ADU The band at the bottom is 1 ADU brighter than the background. The improvement is very obvious Std. Deviation single bias frame: 1.37 versus 3.53 Std. Deviation master bias ( 1000 frames ): 0.07 versus 0.48 In graphical form ... Conclusion: The read noise in a single frame from the D7500 is around 40% of that in one from the D5300. This should give me greater flexibility to reduce exposure times and still ensure that the read noise is only an insignificant component of the overall noise. I will need to consider further the impact of the very low level of pattern noise in the Master Bias; it is so low that I will think about whether or not I still need to calibrate my lights with a Master Bias ( particularly for long exposures when the noise is dominated by light pollution and thermal noise ).
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ImPPG has moved to GitHub: http://greatattractor.github.io/imppg/ ImPPG performs Lucy-Richardson deconvolution, unsharp masking, brightness normalization and tone curve adjustment. It can also apply previously specified processing settings to multiple images. All operations are performed using 32-bit floating-point arithmetic. Supported input formats: FITS, BMP, JPEG, PNG, TIFF (most of bit depths and compression methods), TGA and more. Images are processed in grayscale and can be saved as: BMP 8-bit; PNG 8-bit; TIFF 8-bit, 16-bit, 32-bit floating-point (no compression, LZW- or ZIP-compressed), FITS 8-bit, 16-bit, 32-bit floating-point. ImPPG can also align an image sequence, with possibly large and chaotic translations between images (aligned output images preserve number of channels and bit depth). This can be useful, for example, when preparing a solar time-lapse animation, where subsequent frames are offset due to inaccurate tracking of the telescope mount. Other possible applications are smoothing out of terrestrial landscape time-lapses or preparing raw frames (with serious image jitter) for stacking. ImPPG is free and open-source, licensed under GNU GPL v3 (or later). Building from source code (C++) requires Boost, wxWidgets and (optionally) FreeImage & CFITSIO libraries and is possible on multiple platforms. Windows executables (32- and 64-bit) can be downloaded using the links below. See the README file for details on usage and building. Screenshots: Sample results (processing and animation alignment): Image processing tutorial Solar processing tutorial by Michael H.F. Wilkinson Astrobin users can add ImPPG to their “Gear” list: imppg Files: imppg-src.zip: source code imppg-win32.zip: Windows program (32-bit) imppg-win64.zip: Windows program (64-bit) If you are not sure what you need: download the latest imppg-win32.zip, unpack it and run imppg.exe. Version 0.5 and newer: go to http://greatattractor.github.io/imppg/ Version 0.4.1 (2015-08-30) Enhancements: – Numerical sliders use 1-pixel steps instead of hard-coded 100 steps – Output format selected in batch processing dialog is preserved – Unsharp masking not slowing down for large values of "sigma" – Increased the range of unsharp masking parameters Bug fixes: – Invalid output file name after alignment if there was more than one period in input name – Crash when a non-existing path is entered during manual editing – Program windows placed outside the screen when ImPPG was previously run on multi-monitor setup – Restored missing Polish translation strings imppg-src.zip imppg-win32.zip imppg-win64.zip Version 0.4 (2015-06-21) New features: – Image sequence alignment via solar limb stabilization – FITS files support (load/save) – Zooming in/out of the view Enhancements: – View scrolling by dragging with the middle mouse button – Logarithmic histogram setting is preserved Bug fixes: – Tone curve in gamma mode not applied during batch processing imppg-src.zip imppg-win32.zip imppg-win64.zip Version 0.3.1 (2015-03-22) New features: – Polish translation; added instructions for creating additional translations Version 0.3 (2015-03-19) New features: – Image sequence alignment via phase correlation Enhancements: – Limited the frequency of processing requests to improve responsiveness during changing of unsharp masking parameters and editing of tone curve Bug fixes: – Incorrect output file extension after batch processing when the selected output format differs from the input Version 0.2 (2015-02-28) New features: – Support for more image file formats via FreeImage. New output formats: PNG/8-bit, TIFF/8-bit LZW-compressed, TIFF/16-bit ZIP-compressed, TIFF/32 bit floating-point (no compression and ZIP-compressed). Enhancements: – Enabled the modern-look GUI controls on Windows Bug fixes: – Selection border not marked on platforms w/o logical raster ops support (e.g. GTK 3) Version 0.1.1 (2015-02-24) Bug fixes: – Blank output files after batch processing when L-R iterations count is 0 Version 0.1 (2015-02-21)
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From the album: Solar System Objects
There was a (near) total lunar eclipse last week and I happened to be lucky enough to be on the right side of the planet to see it in it's entirety.... These images were taken with a stock Canon 7D DSLR attached to my 14" Skywatcher GOTO Dobsonian and I had my 8" SCT setup to observe it along with the binoculars... what a fantastic night. I'll tell you that the eclipsed moon viewed through the C8 with the TV 31mm Nagler Type 5 eyepiece is a amazing sight... the full disc of the rusty moon, some stars sprinkled around it and witnessing a star being occulted by the red moon was something else.© Mariusz Goralski
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From the album: Deep Sky Imaging
This is my first image created using my new camera. This is NGC3603 and NGC3576 (AKA The "Statue of Liberty" nebula), a massive H-Alpha region containing a very compact open cluster, located in the constellation "Carina" about 20,000LY away. I took this photo on multiple nights, between 7th - 17th May 2021. Imaged using a QHY268M attached to a 80mm f6.25 refractor on a equatorial mount. Total exposure time was 25 Hours and 35 minutes using 7nm HII, OIII and SII Narrowband filters... imaged from a bortle 4-5 semi rural sky. HII: 3x600s, 12x900s & 8x1200s subs OIII: 18x900s & 11x1800s subs SII: 21x900s, 2x1200s & 7x1800s @ HCG:62© Mariusz Goralski
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From the album: Deep Sky Imaging
The Carina Nebula (NGC 3372) also known as the Grand Nebula, Great Nebula in Carina, or Eta Carinae Nebula, is a large complex area of bright and dark nebulosity in the constellation Carina. The nebula lies at an estimated distance between 6,500 and 10,000 light-years from Earth. This image was taken from my backyard in Bortle 4-5 skies through a 80mm refractor at F6.25 (500mm focal length) with a QHY268M camera through 7nm H-Alpha, SII and OIII filters. Total exposure time was 5 hour and 50 minutes. Subs captured were HII: 12x600s OIII: 2x600s & 4x900s SII: 10x900s @ HCG:62 on 18th May 2021.© Mariusz Goralski
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From the album: MOON
Moon Surface with AstroDinsk 23 April 2021 21:35 Celestron Nexstar 6SE ZWO ASI astrocamera 462mc-
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From the album: MOON
Moon Surface 16 April 2021 21:32 Celestron NexStar 6SE ZWO ASI 462mc- 1 comment
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From the album: Deep Sky Imaging
This is NGC3603 and NGC3576 (AKA The "Statue of Liberty" nebula), a massive H-Alpha region containing a very compact open cluster, located in the constellation "Carina" about 20,000LY away. I took this photo during two nights, 14th and 15th March 2021. Imaged using a active cooled and full spectrum modded Canon 40D DSLR attached to a 80mm f6.25 refractor on a CGEM equatorial mount. Total exposure time was 3 Hours and 31 minutes in natural color through UV/IR Cut filtered subs from a semi rural sky. RGB: 19x60s, 19x120s, 18x180s and 20x300s subs @ ISO1600.© Mariusz Goralski
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Statue of Liberty Nebula (NGC3603) - 19Feb-15Mar2021
MarsG76 posted a gallery image in Member's Album
From the album: Deep Sky Imaging
This is NGC3603 and NGC3576 (AKA The "Statue of Liberty" nebula), a massive H-Alpha region containing a very compact open cluster, located in the constellation "Carina" about 20,000LY away. I took this photo on multiple nights, between 19th February and 15th March 2021. Imaged using my cooled and full spectrum modded Canon 40D DSLR attached to a Bosma 80mm f6.25 refractor on a CGEM equatorial mount. Total exposure time was 22 Hours and 1 minute using 7nm HII, OIII and SII Narrowband filters and stars are from natural color (UV/IR Cut filter) subs... imaged from a semi rural sky. HII: 6x600s, 6x900s and 4x1200s subs, OIII: 10x900s, 8x1200s and 1x1800s subs SII: 18x1800s subs RGB: 19x60s, 19x120s, 18x180s and 20x300s subs @ ISO1600.© Mariusz Goralski
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