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About evil_yoda

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    Calne, Wiltshire
  1. Thanks for the compliments. Just need to settle on a the next target now. So many options!
  2. Hi All, Although not as much data as I would have liked, I'm going to call this one 'finished' for now. Maybe I'll add some Ha at some point, but I'm itching to try a new target. I've had the RC8 for a few months now, and between the clouds I only managed about 6 hours of decent-ish data. I had high hopes for getting some more nice data last night, but the secondary mirror on the RC8 had dewed over and I didn't notice until late, so I didn't use much of it. It's a bit over processed and I've not got a decent way to produce flat frames for this scope yet, but I'm quite happy with the result. Bit of a steeper learning curve coming from the ED80! 3hrs Lum 1hr each RGB Processed in Pixinisights Cheers, Matt
  3. Thanks! Looking forward to getting some more data for it when the weather gets better. The RC8 is fairly new to me and I've only had it for a couple of months. I've been using the 1600MM on an ED80 previously, but needed to scratch the RC8 itch! I'm liking the large size of the DSO that the RC8 focal length gives me with the 1600mm. Always wanted to get some close up galaxy images. Despite the fact that I've not collimated the scope properly yet, and my guiding has only been OK-ish, I'm really happy with the combination. It was never going to be as sharp as with the ED80, but it's good enough for me. Hopefully even better when I get the scope collimated properly. I view and process on a 4k laptop screen, and I wonder if that helps in making the images look nice and sharp at 100% There may be better cameras if the RC8 was your only scope, but the 1600MM is the only CMOS camera I've tried so far, and I'm very happy with it.
  4. Thanks vlaiv. I'll give it a go before and after stacking when I get back, and see what the difference looks like. Do you recommend the IntegerResample process to do the binning? I'm still very much in the beginner category when it comes to Pixinsight! I think I should have put this in the "processing" sub-forum really! Matt
  5. Hi all, I've managed to get about 2 hours worth of luminance over the past few nights for M81. A mixture of 60 and 90 second subs with the ASI1600mm. The scope still needs to be better collimated and the seeing wasn't great, but I was keen to start playing with the data I have until the clouds go away! Because I'm quite oversampled with the RC8 and the 1600MM, I guess I really should be binning 2x2 to get the best image. I think that because this is a CMOS camera there's no point in hardware binning, so it is better to do this in software. I'm using Pixinsight, so at what point in the workflow is it usually best to bin the images? Before or after stacking? Before or after any sharpening? Is software binning the image just the same as resizing, or is there another benefit? The attached image hasn't been resized, just cropped a bit from the edges and some heavy handed processing Matt
  6. Thanks vlaiv, I gave the secondary a little tweak using a defocused star to centre the secondary shadow, but other than that it didn't seem too bad.
  7. Thanks. Yes, this was at native focal length of 1625mm. M33 is not one I've tried much previously as it was a bit small in the ED80, but looks like it'll be a good test of the RC8 when I have it set up a bit better.
  8. Hi all, I finally managed to get out and grab a whole 12 minutes worth of 120s subs between the clouds last night with my new to me RC8. I've had it for over a month but the weather gods haven't been playing ball recently. I've not spent much time collimating the scope yet, the mount isn't properly balanced or polar aligned and my PHD2 guide graph was all over the place. I think my focus was a bit off too. Perhaps I'm just glad to be out imaging again, but I was quite chuffed considering the small amount of data. Looking forward to some more clear skies hopefully when everything is a bit better set up. GSO RC8 CF HEQ5 Pro ASI1600MM A quick stack and process in Pixinsight 6 X 120s Lum Cheers, Matt
  9. Hi Olly, I'd been looking around at different scopes to fit somewhere in the focal length I was aiming for, that would be a 'reasonable' match for the HEQ5 in terms of weight. I know I'll need to tune the mount somewhat to get the best from it for a scope of this focal length. I'm happy with the camera I have, and also the mount (for the time being at least!) I had considered a newt, but these generally seem to a bit more difficult to balance with the imaging train hanging off to one side. And quite heavy. Also looked at something like a C8 edge. Longer focal length than the RC8, perhaps a similar weight though. Another refractor would be nice. Skywatcher 120 Esprit with a focal length of 840mm gives me an arcsecond per pixel, but starting to get expensive. And the OTA is almost 10kg. The RC8 is a longer focal length and means I'll need to bin 2x2. But... It's lighter and more compact, and should be easier to balance than a newt perhaps. Cheaper and lighter than a refractor. I got this one second hand for a good price, so if after a year or so it isn't a good fit for me, I'm sure I'll probably get most of my money back if I sell it on. Either way it'll be fun to try something a bit different than the little ED80 (which will still be getting lot's of use). Cheers, Matt
  10. Hi vlaiv, I've managed to find myself a used carbon fibre RC8! Cloudy nights for a while longer I suppose. Not got it yet, but it's totally standard with the factory focuser etc. I assume you upgraded the focuser on yours, and was wondering what you upgraded it to? Doesn't look like the standard focuser has a threaded attachment for the imaging train. Might be a while before I can upgrade the focuser, but it's always fun to make an upgrade list Matt
  11. Thanks vlaiv, I've seen some of the superb images you've produced with the RC8 and the HEQ5 which is one of the reasons I thought it might be the way forward. The belt mod might be on the todo list if I do get an RC8! Cheers, Matt
  12. Hi Graeme, From memory, my Tot RMS as reported by PHD2 varies between 0.8 and 1.5 depending on the night. To be honest, I've not spent much time fine tuning the the mount and polar alignment to improve the guiding as it's always been perfectly adequate for the ED80, but I appreciate a longer focal length would need much better guiding. I did look around at some of the newts, but they all looked to be quite heavy and probably more difficult to balance the shorter tube RC or cassegrain designs
  13. Hi all, I've currently got a Skywatcher ED80, HEQ5 and a ASI1600mm, set up in an 'obshedvatory'. I like doing the bigger nebula etc with the ED80 and the focal reducer, but I'd also like to fill the frame a bit more with some of the smaller galaxies. The ED80 will be staying, so I'd like a companion for it. Only having an HEQ5 limits me a bit to the weight of a new scope, so I've been looking at the CF RC8 as they seem quite light for the aperture. I appreciate that it can be a bit tricky to collimate these scopes (and I've never colimated a reflector before). Also I think I'd need to bin 2x2 with my ASI1600 with the pixel size. Otherwise I keep coming back to the RC8. Does anyone have any other suggestions of a scope that would fit the bill without spending a fortune? Matt
  14. Hi Nick, I use the ZWO 1600MM with the 80ED with the focal reducer, but before I used the focal reducer, I did need an extension tube. I think I used this one, which gave plenty of extra focus to play with. https://www.bresseruk.com/revelation-50mm-extension-tube-2.html Cheers, Matt
  15. I've contacted them a few times recently. They always respond, but it's usually in normal working hours. I think they're based in Spain though.
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