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thomasv

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About thomasv

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    Star Forming

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    Cambridge, UK
  1. Oiii now sold, Ha still available.
  2. Don't know if any help, but I've hammered pieces of pipe into the ground, into which the tip of the tripod legs fit. You could cover them with gravel as long as you can find them again somehow and just expose them when you setting up.
  3. 7nm Ha and 8.5nm Oiii in as new condition. I'd like to ask £80 for the Oiii and £95 for the Ha one. Price includes postage, with buyer paying paypal fees.
  4. As new condition, only used a couple of times. Price £135 with postage included, with buyer paying paypal fees.
  5. Hi, I think as it's being used with a lens, the spacing is not super critical as you can adjust focus slightly, as long as it's roughly right and gives you a bit of margin beyond infinity. I did cut the spacer so that it gave me the required 44mm flange to sensor distance. The posted picture was cropped and stars reduced, I can post a full sized unedited sub later.
  6. Hi, yes they say the older non USM Canon 300m is actually sharper than the latest. I have a geoptik clone EOS to CCD adapter like this one: https://www.astroshop.eu/dslr-lens-adaptors/omegon-t2-adapter-for-canon-eos-lenses/p,43762 connected to a TS filter drawer unit: https://www.365astronomy.com/ts-optics-filter-quick-changer-for-36mm-round-unmounted-filters-length-10mm-including-filter-drawer.html then a spacer that came with the 1600, I just had to shorten it a bit. You may not need the filter drawer if you don't want to swap filters with your colour cameras, you can put an LP filter inside the EOS to CCD adapter I think. I also have the ZWO EOS to CCD adapter but I found the omegon more solid as its got a ring that you can tighten up against the lens.
  7. Several clear nights in a row, so spent two evenings on this. When I say evenings, with setup and dodging the moon it's about 80min worth of each Ha and Oiii. Ha was 4 min subs, Oiii 5mins subs, with ASI1600 set to lowest read noise setting (i think gain=300). Canon 300mm F4 wide open and using Baader 7 and 8.5nm filters. Stacked in Astroart and adjusted in Gimp. Advice appreciated, I know it's probably too blue, as I was desperately trying to show the blue outer bubble. Just received today the Baader 'ultra-narrow band' filters that I want to try, but I have to do some hacking as I bought 31mm for availability, but my filter drawers are 36mm, so some 3D printing will be required. Attached a picture of the portable setup, as I'm just about happy with it, after trying many variations. The picture also shows the extent of light pollution, although it was taken in 'night shot' mode, so not quite as bad as this, but I do have two LED lights just outside my garden.
  8. Are you aware of the Sony "star eater" issue, search it up if you aren't. I don't know exactly how big of an issue is for long focal length. Also, of course you'd need to consider modding it if you want good Ha sensitivity.
  9. Finally had a chance to give a proper go with my idas NB1 filter. Don't like how the stars came out with red halos, otherwise happy and will keep the filter. Someone might be able to fix the stars who is more knowledgeable in processing. Used a modified Canon 6D with equinox 80ED (no flattener), F6, about 2.5 hours of exposures in Bortle 5 skies with LED lights just outside my backyard.
  10. Here is the edited version, and also managed to plate solve it, I think it's coming from the correct radiant to be a Perseid.
  11. Huawei P30 pro namely, quite fun. Only had it for a few days, for a phone camera it's impressive, of course a lot of the performance comes from extensive processing in the phone, so not for pixel peepers. Unfortunately already discovered a bug, which doesn't let me manually fix the focus to infinity, hope that will be fixed in a future SW update (auto mode does reach infinity). Anyway, here is Ursa Major above a lake, according to exif info it was 0.85s exposure at iso 65535 (exactly !), with main camera which is F1.6.
  12. Thank you very much for the replies, nice to have some confidence that it is a meteor. I think I'll try to edit out the satellite trail. The white balance was set to daylight btw. I've tried to plate solve it on astrometry but it failed. I'll try again, perhaps another frame of the same area. Regards.
  13. Set up for Perseid hunt, set alarm for 1:30am to start imaging for a couple of hours of darkness. I think I caught a few small ones, this one seems the biggest, however would be nice if people could confirm that it is really a meteor. I'm talking about the horizontal one, the other trace is probably a satellite. The area was just west of Polaris, even if it's a meteor, I'm not sure it's a Perseid. Thanks.
  14. The evoguide is not corrected, so you'll get distortions on anything but the smallest of sensors. Have tried it for fun, but it was only sharp in the very centre of the aps-c sensor, below examples are heavily cropped.
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