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About Northernlight

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    Ccd Imaging, Skiing, Diving, DIY Electronics, A nice cold beer on a hot day.
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  1. OGEM open source mount

    So what drive mechanism is used ? I'm confused as i thought a friction drive doesnt use pulleys ?
  2. Its a tough call on the old speed debate. If you live in the uk where the weather is usually terrible and clear nights are rare i can understand the obsession over speed. I used to obsess over speed, but id rather have 10 great subs on slower scope than 20 poor subs on a faster system
  3. Sadly even second hand this would be way beyond my budget. My budget will literally extend to a SW esprit 150.
  4. 152mm Doublet CA on broadband imaging

    Hi Dave, why would the 140 be different to the 152 ?? Does the 140 have a different mating element
  5. Hi all, Just wondering if ayone is imaging with a 152mm doublet frac. I'm especially interested in CA during broadband LRGB imaging as reading about these scopes seem to suggest that the CA isn't too bad. Basically wondering if i can get away with a cheaper 152mm doublet for imaging or if I'm going to need to pay extra and get a triplet apo Rich.
  6. On the ccd67 the optimal spacing from ccd is 85mm. I use 85mm spacing for mine and get pefect stars to corners on my 8" RC
  7. For me, it's a similar issues as Sara with lots of dust and pollen type debris on the mirrors, hence wanting a bigger apo as easy to clean and maintain.
  8. I'm in a slightly different dilemma. I have my 8" RC / reducer combo which took a while to fettle, mainly due to getting to grips with RC collimation and now that I've tamed the beast i face a new set of challenges. Keeping the primary mirror clean Keeping the secondary dew free, even with a seconday heater installed. The RC has a few benefits in that i can image @ 1600mm or at 1100mm with my reducer, but having to keep stripping it down 2-3 times a year to clean the primary is starting to feel like a chore, Whilst my 102mm doublet, is always hassle free and a joy to use. So for me, I'm thinking that something like a 150mm apo might be the right choice even if the image scale is a little smaller and the resolution is a bit lower vs the RC on galaxies, i think the trade off will be worth it. Rich.
  9. Hi Merlin, Many thanks, I had just assumed that PixInsight would somehow scale the bias & darks in the same way when you combine 1x binned & 2x binned lights. Regards, Richard.
  10. Hi All, I usually image at 1x binning and thought i'd try some 2x binning and i'm a little confused about the calibration process. So i created some new 2x binned flats and then tried calibrating them with my SuperBias and Master Dark in Pixinsight which then winged about incompatible geometry. So do i need to create my darks or Superbias as 2x binning to allow me to calibrate my 2x flats ? cheers, Rich.
  11. RC collimation

    Hi, just my 2 cents. Rc collimation is often seen as being a nightmare, but with the right tools it's very simple. 1. Use a good quality laser to adjust tilt on focuser so laser dot appears centered in dot of seconday reflection. 2. Use a Tak collimation scope, to adjust secondary, and then fine tune primary 3. Repeat steps 1 & 2 and you're done........simples..
  12. Hi All, Just have a quick question on focal reducer spacing. So i have an AP .667 reducer which has an optimum spacing of 85mm to give x.667 reduction If i reduce the spacing by 5mm down to 80mm, will this cause a greater reduction i.e < .667 (e.g 0.6) or will it go the other way and be > .667 (e.g 0.7) i use the abovr numbers purely for illustration puposes. Many thanks, Rich
  13. anyone own Apm 140 or 152mm ED Doublet

    Thanks olly, now i see what you mean, hence why i get decent narrowband images using my 102mm doublet.
  14. anyone own Apm 140 or 152mm ED Doublet

    Olly how do you mean ? i have a cheap 102mm doublet and it seems to perform quite well as per the image below.
  15. anyone own Apm 140 or 152mm ED Doublet

    Thanks Dave, Just curious how good or bad it performs for imaging and there aren't that many reviews out on the web. I did however come across an old thread on cloudy nights which got quite heated discussing this scope with an batch of them that were sent to the usa which were about 10 users reported serious issues with the lens assembly and subsequently has issues with the supplier. So not sure what to make of this scope.