Mark_C

Very nice! Regarding flats, I also do the same, I use an A4 ring binder wallet that I've separated in to one single sheet then wrap it around the OTA dew shield with an elastic band. I then higher the exposure so that it's at around 60% in the histogram, then get SharpCap to take the flats, seems to work just fine and the results seem to be decent. I think this is the way DayStar advise to take solar flats, or use one of their dedicated flat screens (that do pretty much the same thing but more convenient.)

Thanks Grant, I suspected this was the case and it is great to have confirmation from yourself and other users of the Quark that what I'm experience is perfectly normal, it gives me reassurance. 🙂 I suspected it was, thanks for the heads up Stu! 🙂 That's incredible! Very sharp and detailed. It's impressive how excellent results can be achieved even when you have to fight against challenging equipment, well done!

Ah yes when I queried FLO about my concerns about Quarks and their QC before purchasing, they did say that they are checked by Gary, hence why I bought it from them as I didn't want to take the risk elsewhere, plus I'd be backed by FLO in the event there are any problems. I did not realise there was such a wide variation with these devices, and it sounds like mine may actually not be a bad copy after all. I did not realise how bad they can be. Oh wow, that really is rather bad! How does your images look once the flat has been subtracted?

Thanks for the responses all! Really appreciate the feedback. I guess it's comforting to know that I'm not the only one who has these uneven illumination issues with this filter. To be fair with the flats taken and subtracted within Sharpcap the results are fairly good (i think) although I'm no solar expert. I've attached a picture - this was taken with an Evostar ED120 and UV-IR cut filter. I've not had a proper chance to test the different dial settings of my quark because the weather has been so rubbish over the past 6 months that it clouds over before I get a chance to try each setting! This picture has been taken with the dial set at 0 from a set of 1000 frames. I've just read through this thread and this is very dissapointing to see, had I known this beforehand I probably would have avoided buying this filter, as the CN thread does not represent Daystar in a good light. I think the attraction of being able to put this filter on a long FL scope such as the ED120 to get close in details drew me in more than the risk of getting something that may not have worked properly!

Thanks Stu, I think that's definitely good advice. Hopefully @FLO will see this, if not then I'll get in touch!

Hi all, I purchased my Quark from FLO last October and was just wondering if this is normal for a Quark Chromosphere to have uneven field illumination such as in the flat that I've attached to this post? I find that without taking these flats, my solar images are totally unusable when I start stretching the curves in imppg. I realise that taking flats is good practice anyway, but ideally would have liked to not have these inconsistencies to begin with. The unevenness is consistent regardless of whatever OTA I attach the Quark to so I assume this lies with the Quark itself. I'm just wondering is it worth asking FLO to look in to this being a warranty issue or is this normal and to be expected?

Thanks for the positive comments everyone, it really is appreciated! I just slapped everything in to Pixsinsight's WBPP at default settings so I suspect that with the aforementioned tweaks in the settings I can reduce or totally eliminate those pesky sateliite trails!

Hi all, This is my first attempt at M106 and overall quite happy with the end result. This is an integration of 119 x 300 sec exposures taken at native 2800mm F10 with an 11" Edge HD. The image is 2x2 binned and was taken with an ASI2600MC. No doubts that a focal reducer would have helped tremendously with this! Processing performed PixInsight with BlurX and NoiseX. Super frustrated with the ridiculous amount of satellite trails which were passing the FOV - they are still slightly visible in the final image. 😞

Thank you! 🙂 definitely go out and give it a try, you might be surprised with the results. The C6/HEM15 is a much smaller and nicer setup to get to grips with. The C11 is a heavy beast and I do not have a permanent setup so it's never particularly a nice experience to set up, which is the only downside of having such a setup. I went out with the expectation of failure but happy to be proven wrong. 🙂

Bryan, thank you for the kind words! Glad to hear from someone else who has also endured the difficulities of long focal length imaging, it really is a wild ride but its well worth it. The M51 is a bit of a nightmare at native FL to be honest, even with the big prism and large sensor, there seems to only be 1 prominent guide star so if conditions aren't great , guiding suffers a lot as multi star guiding is either sketchy or just isn't functional. The Celestron OAG was one option I had considered as the rotation feature was really attractive along with the big prism, but like you had unfortunately discovered it really consumes a great deal of backfocus which would cause issues with the way my ZWO system is set up. Another consideration was the Askar OAG but I think that has a slightly smaller prism. Absolutely 100% agree that a reducer is something that I should aquire and should be considered an essential purchase for this scope - not only will it reduce oversampling a little, but like you say imaging at F7 will allow for light collection in a shorter space of time. The great thing about the APS-C sensors is that there's plenty of cropping potential so lessening the FL isn't an issue. 🙂 I think the aim for me in this instance was to stretch the limits of what's possible with this telescope on a mount that's not even supposed to be rated for imaging beyond 900mm. 🤣 Just waiting for another long session to arise, doesn't look promising though as weather has been/looks to be awful 😞 and it doesn't help with the nights now rapidly drawing out. Thank you, really appreciate it! 🙂

Thank you for the positive feedback, I really appreciate it! 😀 Absolutely delighted with the AM5, it has exceeded expectations and makes a very nice setup as both the scope and mount are highly versatile! Never would have expected this setup to work but it handles the C11 with no issues at all! I am now wondering if ordering the 0.7x reducer for the C11 is actually worthwhile as so far these results even at F10 are nothing short of fantasic. The only issue I sometimes find is finding a decent guide star but it does help tremendously in having an OAG-L with a larger prism and an ASI174MM attached, that larger sensor really makes a difference!

Hi all, Had an extensive break in the weather last night which managed to bag me 71 x 300s exposures on M51 with an additional 15 x 300s from a previous session. This was imaged at 2800mm @ F10 with a Celestron Edge HD 11" on a ZWO AM5 mount using a 2600MC. Image was software binned in Pixinsight 2x2 and optimised with BXT and NXT. Conditions were quite difficult as the first part of the night was slightly breezy and of course at this FL guiding can be a pain, but it calmed down later in the night and am very happy with the results. Overall pleased with the outcome and am really enjoying imaging at this focal length, it's possible to frame some really small objects. F10 is a bit of a pain but absolutely workable if you have dark enough skies (I'm currently in a B4 area). Next target is M101!

Thank you Steve! I honestly wasn't expecting anything remotely close to this so it really is a suprise. Given the nature of the AM5, I probably wouldn't have opted for deep sky imaging with this scope as it was mainly intended for planetary imaging, but knowing that I can get these kinds of images at this FL means that it can only get better with a FR and even more so if I opted for Hyperstar. This really is a versatile scope that has so far impressed me!

Hi all, After recently purchasing a Celestron Edge HD 11" and wondering if I had made the right choice trying to even dare perching it on top of my AM5, let alone image with it, I can safely say it has been quite a positive experience and way surpassed my expectations. I have been saving up for the 0.7x reducer but in the meantime thought I'd have a go in its native configuation, more so for a laugh than anything else because I fully expected it to be a failure given how often I've seen mention of not bothering attempting imaging at this FL. Have to say that I'm quite impressed, it's not the sharpest image there is, nor will it win any awards, but I'm happy with the results given the setup. It's quite tricky imaging at this FL, the seeing has to be faily good otherwise guiding does suffer a little and it makes accurate focusing difficult, also any slight gust of wind will ruin a sub. Last night was particularly good, I was getting guiding RMS of 0.30, which for the AM5 and this OTA is really good. This is M81 shot at native focal length (2800mm f/10) with an ASI2600MC. Processed in Pixinsight with BlurX, NoiseX with slight colour saturuation enhancements with curve adjustments. No other processing done other than just a little cropping. The image is slightly oversampled due to the pixel scale. The sub consists of 39 x 300s exposures, this is over 3 days (due to clouds) under heavily moonlit skies. With further integration and dark skies I'm certain further detail can be captured.