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About jm_rim

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  1. There are not many wide-field scopes (as far as I can find) with a larger than aps-c size fully corrected flat field. Once in the future, I was planing to buy a CCD with a KAF-16200 (diagonal 35mm) sensor, but I'm not so sure anymore. Hopefully, ZWO makes their ASI071MC (diagonal 28mm) in mono, which a lot more scopes fit ... This i have thought of many times. I have looked at the, Nikon 400mm 3.5 ais, Zeiss Tele Tessar T 300mm f/4 and ... , but are they worth it, would a cheap ED or APO not be better corrected for astrophoto?
  2. It can be tricky, but I have the Skywatcher Explorer 150pds which I believe has a different focuser. The biggest problem I have, is that it shifts out of focus when I fasten the focus lock.
  3. When living in Denmark when is it not windy and considering your mount a small/smaller refractor would not be as wind sensitive. I'm using the same scope on an EQ5 and still have trouble with the wind (of course, it does not help when I live near the Danish coast) So I'm considering the exact same, and as RichLD said. And depending on your preferred targets, using an APS-C sensor, then a focal length between 400-600 mm is a nice range..
  4. That sounds very interesting. How is it set up? Belt drive to AstroEQ AstroEQ to computer but what about the guide camera? Is it connected to AstroEQ or computer and do you control it all through Stellarium or similar?
  5. I will try to find a light weight solution. The load capacity is my main concern, and I hope to upgrade the mount as soon as I can afford it. But that just adds a lot of new questions, eg EQ6 or wait and buy one of the big ones, but that is for another time ;-)
  6. If I had the money I would love a EQ6. With my current setup, EQ5 and a RA moter, and good polar alignment I have been able to get 120-150 sec subs. But sadly not enough keepers..
  7. That's nice to know :-) which finderguider do you use?
  8. One thing is decided, upgrade to GOTO, but I'm not entirely sure about auto guiding yet. I've found QHY5-II on sale (http://www.365astronomy.com/QHY-5-II-MONOCHROME-Planetary-and-Guide-CMOS-Camera.html) and combining it with a Guidescope (http: // www. 365astronomy.com/365Astronomy-60mm-Compact-Delux-Finder-and-Guidescope-Kit-with-1.25-Non-Rotating-Helical-Focuser.html) will be the cheapest solution, but will a piggy back solution with Startravel 80 bolted to a dovetail be a better solution??
  9. Thanks for the feedback, It’s good to know that it is possible with a finder guider especially to save weight, which is my biggest concern - considering my current setup ... I'm not sure if I got it clarified good enough, but I’m thinking of Spending max £ 700 in total, for both mount upgrade and auto guidance. Do you think I'm too close to weight limitation with my current scope?
  10. I'm going to upgrade my EQ5 mount, either with the dual axis engine kit or the SynScan GOTO Kit, to be able to auto-guide. My primary imaging scope is the Skywatcher Explorer-150PDS using a Nikon. My goal at this time is to get subs of 300sec (of course higher if possible), as cheap as possible, as i’m still learn :-) At some point I want to upgrade the mount, scope, and ccd but need a lot of more money and experience first. I have read a lot about autoguiding and can see that there can be some difficulties. From what I've been able to read, the biggest problem with auto-guiding a reflector is flexsure, and the best way to avoid this is at OAG. However, that this can be difficult (eg. requires more sensitive guide camera - increasing the prices a lot). So my question is, with a goal of subs of 300 sec - and preferably keeping it under 350£ - should I go for: OAG and QHY5-II-M guide camera - and is it sensitive enough? Guide Scope Bundle - Suitable for Piggy Backing (https://www.firstlightoptics.com/guide-cameras/guide-scope-bundle-suitable-for-piggy-backing.html) - or would I risk too many issues with flex sour? Finder-Guider Scope (like https://www.teleskop-express.de/shop/product_info.php/info/p7073_TS-Optics-Deluxe-60-mm-Guiding-Finder-scope-with-microfocusing. html) and a sensibly priced guide camera - like ToupTek or Zwo Jesper
  11. I would like an astro-modified Nikon, but can not find any at a reasonable price, so i will try to modify a camera myself. But where do I buy a new filter in the EU? I'm thinking of converting to full spectrum, what's your experience with this? Jesper
  12. I’m thinking the same, but since it’s only few evenings during the year, it would be nice with well corrected and fast scope. From what I can find there aren’t many fast (preferably F5 or faster) wide field scopes.
  13. Very nice to know, thanks. Is it the Skywatcher Evostar 80ED you’re referring to?
  14. I want to buy my first wide field scope (300-400mm) for astrophotography and found the new William Optics Zenithstar 61 APO on FLO. I know there are not many reviews yet, but what I've read is positive. Before I considered - and still do it - telescopes like Skywatcher Esprit 80 ED PRO or William Optics Star 71 II but are they the 2.5x extra costs?
  15. I have been trying figure out the difference between CCD cameras and the many aspect in which they can differ. One thing I haven't been able to find the answer for is regarding sensor size, resolution, and field of view. I found another thread about the same question although no definitive answer, so i thought i would give it a try. Often when I read other threads, forums, and elsewhere regarding which CCD to chose, a common answer is to buy the largest sensor that one can afford to gain a larger field of view. However, as discussed in the link above, why not just buy a CCD camera with smaller pixels and scope a smaller focal length. I know that there is a lot of other factors beside the sensor side, but is there a major benefit by purchasing a CCD with a large sensor, and presumably larger pixel? Jesper
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