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About adh325

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  • Interests
    ◦Sky-Watcher 100ED Black Diamond with matcher flattner / reducer
    ◦Sky-Watcher HEQ5 Mount with EQMOD
    ◦Canon 700D - not modded
    ◦Astronomik CLS EOS Clip
    ◦2x Barlow, 28mm and 7mm eyepiece
    ◦Shopping list - QHY5L and adapter to make up a finder-guider.
  • Location
    Edinburgh, Scotland
  1. That's very clear and very useful - clears up some of my misunderstandings and i'll post some results soon! Thanks for taking the time to explain in so much detail.
  2. That's useful thanks - i'll continue what i'm doing then and stack more data. I didn't realise that also helped to reduce noise - that's good. If the mount is well guided is it worth trying for longer exposures (I have a guide scope fitted)? I'm pretty sure I've achieved 600s before without any major movement in the image. I might try for a higher ISO next time too. Presumably its OK to mix all of these in the same stacked image providing you have matching dark / bias etc? Last annoying question (sorry!) is there a ratio of dark / bias / flats etc you should follow? So for example if i'm stacking an hours worth of light frames, is it acceptable to stack say only 30 mins of dark and bias? Maybe that depends on the imaging equipment....
  3. Is anyone able to offer a bit of guidance on the light pollution issue? Is it worth me even wasting my time taking a whole load more data with no light pollution filter? Or am I better to continue just gathering more and more data with the LP clip in? I'm just wondering if i'm really limiting myself and perhaps no matter how many 400s exposures I take - I wont pick up more detail than I already have?
  4. I tried Pix for stacking - but I think I must have done something wrong because I got some strange red streaks over the image. The same image came out fine in DSS. Anyone else had this happen?
  5. Thanks - I cant remember RGB settings for sure, but think I may have saved the image from DSS without changes. I'll check next time though and give that a try. Cheers.
  6. Hi There, Here's my first proper attempt at M81 & M82. SW 100ED with matching reducer with guided HEQ5 Pro and unmodded 700D with clip-in Astronomik light pollution filter. This was stacked from about 1 hour total exposure - using 6-7 minute exposures at around ISO 800 if I remember correctly. Used flats, dark's and bias as recommended in deep-sky, although with about half the total exposure time of the lights. Stacked with deep-sky, processed with Pixinsight. I think the image is rather blue - and the light pollution filter might actually be blocking out useful light. I'm in the middle of Edinburgh though, so removing the filter might render the image useless. Having used Pixinsight for the first time, i'm impressed with its capabilities. Worth another try without the filter? Or do I stick at it and collect more data to bring out more detail - or do you think its limited by the length of the individual exposures? Thanks!
  7. adh325


    General images for discussion
  8. Ah - I didn't spot that about the 'L' version. I did look online and saw the 4-optic thing and assumed they were both the same. I guess the longer focal length of the 'L' makes it less prone to CA. It does seem to be very similar to the SW Evostar then, albeit best part of £50 less. Don't understand why such a large scope only comes with a 1.25" diagonal though. Doesn't matter much to me since I already have a 2" from the ED100 already. Here's hoping for some clear skies over the Christmas period - I've got access to a dark-sky site for 4 nights, fingers crossed!
  9. Thanks for all the advice - I've gone for the SW Aero ED 40mm, I'll see how I get on with that. It looks massive from the pictures I've seen on here, almost the same size as a baked bean tin! Will be interested to see how the Bresser performs too - I've always been swayed by a refractor (Newtonians just don't do it for me - I know there's nothing wrong with them and brilliant value, just personal preference I guess), and did a fair bit of research on the best 6" for the money. The SW Evostar 150 definitely seems to be the most popular, but it was the better quality focusser that pushed me toward the Bresser - and the easy up-grade to dual-speed in future (plus the 4-optic design - which is supposed to control CA better...). It looks like a monster though, I've ordered an extension for my HEQ5 which will almost certainly be maxed-out with this tube! I'll post a follow-up when its all set--up, I've found all the information on here really useful and it would be good to be able to contribute. In particular its good to get an idea of what can actually be 'seen' with a particular combination - however appreciate this is somewhat subjective and dependant on many variables! Thanks again.
  10. Hi, I already have a 2in 28mm Skywatcher that came with an ED100 and a 7mm Cel-x for planetary. I'd prefer not to buy too many, I'd be happy with just one for now. Would just under £100 get a reasonable one?
  11. Hi all - I have a Bresser AR-152L coming for Christmas. It'll be for visual work only, mainly DSO. Can anyone recommend a good mid-price-range low power eyepiece that will give some nice wide field views? I've looked at a FOV calculator and it looks like a 40mm would do a good job - but is there a type particularly well matched to this scope? Thanks.
  12. Thanks for the reply. I wouldn't be doing both simultaneously - either one or the other. I was just looking for a piece of software that would give me the best visual feed, with access to exposure settings to get the best from some of the fainter DSOs.
  13. Hoping you guys can help again! Im currently using the above camera as a guide set-up, and after some initial annoyance with software and drivers - seems to be doing a good job. In a few weeks I'm going away to a dark site with some friends. Viewing via the eyepiece is great, but sometimes what you can see is limited (unless you have dustbin aperture). Getting the benefit of a few seconds exposure from a viewing camera would improve the experience. Has anyone found any good software which simply lets you view the camera feed without messing up PHD? On paper the camera is supposed to be able to give HD... Any help much appreciated!
  14. Oh, I meant to ask - what's the expected lifespan of the mirrors in these dobs, before you start noticing degradation in the image? And is the coma corrector a must?
  15. That's good to know about the newt. I was half considering / risking something that size for my HEQ5 and upgrading to a EQ6 later, but sounds like imaging wouldn't be very successful. At the moment I'm using a Skywatcher Evostar 100ED which has worked well when guided for AP. Field of view isn't perfect, but with the matched reducer / flattener and a 700D, M31 fits absolutely spot-on. Just have to be patient with the exposure and data gathering. Think I'll be following your lead on the dob. I'll bet you get some very impressive visuals with a 16"!
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