MarsG76
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Sigma EOS Lens - Rho Ophiuchi Cloud Complex
MarsG76 replied to MarsG76's topic in Imaging - Deep Sky
Thanks for the comment... if Antares is low down from your location, you just might need to spend more time on the area and perhaps use a Neodymium filter for the luminance subs to counter any skyglow.- 8 replies
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- rho ophiuch
- eos lens
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Sigma EOS Lens - Rho Ophiuchi Cloud Complex
MarsG76 replied to MarsG76's topic in Imaging - Deep Sky
I used a DSLR lens but imaged with a QHY268M at -10C and LRGB filters... Imaging at these focal lengths guiding might not be that critical, but I still prefer to guide simply because I know that with guiding there will be no drift possible at all during the night... and I'm able to dither between subs to improve the SNR. -
Hi Astrolovers, Sharing with you my latest image, this time of the Rho Ophiuchi (& Antares) Cloud Complex. The difference with this image compared to my other astro images is that I wanted to image some wide field objects, but use some of my EOS lenses. I have a collection of lenses for my DSLR kit which are not getting enough use, all L series Canon or EX series Sigma and a lot of Prime lenses which should be great for astro imaging with my QHY268M. Of course the dilemma was to get the perfect back focus spacing... and I did have a situation where I thought that I nailed it, but as it turned out later on my second image, it was close but not perfect.... Long story short is that I did eventually nail it and now have expanded my imaging FOV/focal length options. The filters are held in place with a modded filter holder which adds absolutely no length to the BFL imaging train and is very easy to change filters. Any way, if anyone is interested, I'll write up a post in "equipment" to what I did to nail 44mm BFL. This is image has been imaged with a Sigma EX 150mm f2.8 prime lens, with my QHY268M in LRGB. Guiding was carried out by my 80mm refractor as a guide scope at 500mm, so guiding was much more accurate than the image needed. The total integration time for this image was 8 hours and 42 minutes for all of the LRGB filters... Exposures: L:31x60s, 31x120s & 31x180s @ Gain:31 & R:60x60s, G:60x120s, B:52x180s @ Gain:62/OFS:25. One thing to mention is that guiding at this focal length was a joy... no matter what happened, the worst RMS guiding accuracy was about 1/5th of the pixel resolution that was imaged by the Lens... so absolutely no motion blur was registered, the only limitation which was possible was seeing and transparency. Clear Skies, Mariusz
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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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- rho ophiuchus
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Awesome smoke ring...
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I find most astro gear out of stock and (in stock or not) prices are increased by 25-50%!!! ... I could literally sell a lot of my current used gear for more than what I paid for it in the last few years... of course, than I'd be without gear or have to pay a premium to replace it... prices have gone nuts.
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Awesome details.
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Theres nothing wrong with the 120MM.. I use the 120MM mini and I'm very happy with it.
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I find that there is not much tolerance at all... I find that a guide star can go from a round point to a oval within a guide cam movement of 1-2mm...
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Yes you will have to re calibrate guiding because the angle of the camera will change and that will impact on what angle PHD2 sees as north/south and east west...
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You peeps have plenty of objects we're missing out on down here.... but thank to platforms such as this one, we can share the view of the celestial wonders beyond our horizons.
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I agree but also think that most nebulae can look better imaged in NB because there is more flexibility/possibility to bring out subtle detail in processing than with wideband.
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How cool... How good are the pictures taken with it?
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Hi Ivo, How sure are you about this? How much inaccuracy? When I ran a test using PAPS, initially PHD2 reported a PA error of around 4 arc-min in 10 minutes of measuring before I ran the PAPS procedure... After I polar aligned with PAPS, PHD2 reported 0.7 arc-min also in 10 minutes of measurement... Could there be a difference with being in the Southern Hemisphere as the PAPS initial release did not work down here? Mariusz
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Only 2 hours??!?!?... wow.. That is a fantastic image...
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Hi Astroexplorers, Sharing my first frame of my WIP mosaic of the "The Fighting Dragons". This is NGC 6188 or Gum 53 (AKA The Fighting Dragons), an emission nebula located about 4,000 light years away in the constellation Ara. I imaged this with a QHY268M through Baader 7.5nm Sulfur II, Hydrogen Alpha and Oxygen III narrowband filters, using a cheap (it was cheap when I got it before all astronomy gear sky rocketed) doublet 80mm refractor at F6.25 (500mm focal length) and tracked on a "hypertuned" CGEM mount. The total exposure time spent on this frame was 16 hours and 40 minutes. I'm slowly exposing the other frames/plates for the mosaic as I get a bit of clarity... I was exposing some SII data as I write this and had to run out to close my observatory when I heard a sudden down pour... literally went from clear to a downpour in less than 5 minutes... nuts! Clear Skies, Mariusz
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From the album: Deep Sky Imaging
This is the first frame of my WIP mosaic of the "The Fighting Dragons". NGC 6188 or Gum 53 (AKA The Fighting Dragons) is an emission nebula located about 4,000 light years away in the constellation Ara. Imaged with a QHY268M using Sulfur II, Hydrogen Alpha and Oxygen III narrowband filters, through a doublet 80mm refractor at F6.25 (500mm focal length) and tracked with a "hypertuned" CGEM mount. The total exposure time spent on this frame was 16 hours and 40 minutes.© Mariusz Goralski
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I can vouch for that, after a few full nights of imaging, APT 4.00 was rock solid.
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From the album: Deep Sky Imaging
A wide angle area in the sky in the constellation "Leo" with galaxies M95, M96, M105, NGC3384, NGC3389, IC643 and IC648 in the frame. This image was taken from a semi rural (Bortle 4-5) sky during and around a full moon through a 80mm Refractor @ f6.25 (500mm focal length). Tracking was on a hypertuned CGEM mount and the camera was a QHY268M. The total exposure time of 9 hours and 43 minutes on multiple nights between 13 and 19 May 2022. 8 hours of that was on the luminance channel, needing more exposure time due to the bright moon lit sky.© Mariusz Goralski
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Wouldn't be that bad. Looking at the flares, you wouldn't need to crop out much more than when I do with almost every image on my cheap refractor to get rid of most of the edge star distortion. In actual fact cropping out your flares would frame it quite nicely.
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I know it's easily removed but personally I like the flare in the image... I wouldn't want all of my astrophotos to have a flare but this one is OK. Something different from my past images of M104.
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Yawzah.... initially I'd guess stacked filters and internal reflection??
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The antennate galaxies were imaged with a dew shield, wind gusts picked up during the luma exposure of the sombraro when I removed the shield.
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Possible that it's caused by a out of FOV bright star, but more likely it's from a street light. At one point during the tracking the scope was angled where a street light was in that direction and about half of the subs had this flare every night. I had to remove the dew shield from my SCT because there were slight wind gusts which were caught by the shield and caused a bit of a vibration, ruining subs.. as you can imagine that at 2000mm FL it doesn't take much to render a sub unusable... I have dew heating which controlled the condensation on the corrector but external light flaring does (and did) occur frequently in the past when I removed the dew shield.
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Thats disgusting behaviour... what a some dishonest people are doing is, after this oil leak issue has been shown to have been very common, they're palming off the oil leak problem onto unsuspecting buyers and getting the QHY268 series that doesn't seem to have the oil leak problem. They knock off a few hundred dollars from a new price and just go and get a new QHY which happens to be a few hundred dollars cheaper. Looks like cleaning it is your only option... if you're handy with small/jewelers screw drivers than it doesn't look like a difficult job... Look up "Windy City Astronomy" on YouTube, he goes through cleaning this kind of oil leak on one of his videos. Problem is that this oil leak has returned for a number of astroimagers who had it cleaned or cleaned it them selves, so it might return, that said, I'm sure that there is a limit to how many times it will return.
