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TerryMcK

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TerryMcK last won the day on February 18

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  1. Yes it started to work for me yesterday
  2. Yes it can. I use a Canon 50mm f1.8 prime lens on one of my DSLRs to take ultra wide field. I use an M48 to M49 adapter to fit a filter. The M48 is female and the M49 is male. A bit expensive for what it is but it works well. Very little vignetting around the edges that is sorted with flats. If your front element is more than 50mm diameter I would use a clip in filter instead. However if you have a Canon EFS body you have to use an EF lens as the rear of an EFS lens sticks into the body too far. An EF lens has enough clearance to not foul the clip in filter. However focusing is anoth
  3. Absolutely what Brian says is spot on. I personally don’t take dark flats. Just regular flats and add darks that might be six months old. However I don’t take flats every session if I know that the optical train has not changed since I last used it.
  4. I've no idea what the ZWO filter is like as I don't have one nor ever seen one. But from extrapolating the data that is available: From the look of its description on the ZWO website it looks like it is designed to pass Ha and OIII. It has a pass band (normally quoted in nm) of 15nm for Ha and 35nm for OIII. Whereas the Altair one is designed for Ha and OIII/Hb hence the triband name. The Altair one is quoted as 12nm for Ha and 35nm for OIII/Hb What the differences are in practice are difficult to determine from the specs as they are very similar.
  5. Yes indeed. I seem to recall it was prevalent in the OIII and HII spectrum as they are covered in one wider band. Ha seems to be ok. It only affects larger stars though. Any filter like this is a compromise of course and halos can be reduced in processing. I do get better results with the IDAS D2 it has to be said. But I am surrounded by LED light pollution.
  6. I have an Altair tribander and find it good especially under the moon - not sure it blocks out LED lights as well as my IDAS D2 does. I actually have the 2" one which is a bit more expensive than the 1.1/4" one which judging by the price you are going for. Obviously when shooting deep sky you wouldn't aim within 20 degrees of a full moon but it copes outside of those limits well.
  7. ScopeNIghts, ClearOutside and the Met Office all seem to agree that the skies in Manchester will be clear Thursday, Friday and Saturday nights 25/27 Feb 2021. Hopefully this is not wishful thinking and me posting this doesn't scupper it!. However the moon will be at its fullest so I will only be shooting in narrowband. The apps also seem to say that Sunday is fair and Monday should be good but that is too far in the future for me.
  8. I'm looking for a second mount to complement my HEQ5 Pro with Rowan and also am looking at the iOptron CEM70 Center Balanced Equatorial GoTo Mount with iGuider. I quite liked the idea of the 3 x USB3 + 2 x 12volt ports at the head. The blurb seems to show the capacity as being just over 30kg, not sure if that is for imaging, but even with a 1/3 off that is still 20kg. Way enough for my current needs and also gives the opportunity to have a larger scope on. At the time of writing the mount is in stock at a Devon based retailer but conversely to you Paul, the tri-pier or even tri-pod
  9. I’ve noticed that “unread content” doesn’t seem to work anymore. Clicking on it produces a blank list.
  10. IC417 The Spider Telescope: William Optics ZS103 with 0.8 reducer Camera: ZWO ASI 183MM 29 x Ha 360 seconds at Gain 111 Offset 8 28 x OIII 360 seconds at Gain 111 Offset 8 42 x SII 360 seconds at Gain 111 Offset 8 Mount: SW HEQ5 Pro with Rowan Processed in PixInsight, Photoshop CS 2021 and Topaz Denoise AI All images acquired Feb 10th to 12th 2021

    © Terry McKnight 2021

  11. Yes I just watched it on the BBC News and it is superb.
  12. It's clouding over now but it was forecast. I can see clouds in the guide cam. Still using multistar guiding in PHD2.
  13. ScopeNights reports the sky should be clear tonight here.
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