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  2. Thanks guys, you are very kind. I might try and do another session and add to what I already have.
  3. Today
  4. I was very impressed with this camera until I saw that the drivers etc. were Windows only, so as I'm Linux only it's a no! Pity
  5. All things considered I think thats really good.
  6. Absolutely wonderful!! πŸ‘πŸ‘πŸ‘πŸ‘
  7. Whatever that is, it certainly works! Very nice indeed. πŸ‘πŸ‘
  8. Yes it started to work for me yesterday
  9. Yesterday
  10. Yep works for me Terry as well, try clearing your cache and reloading
  11. Strange, it works for me. Carole
  12. Hmmm. I'm a bit torn now. My scope has a 2" Focuser, with an adaptor that steps down to 1.25". So would a 2" filter screw into the front of the 2"-1.25"adaptor? Then I still insert my ZWO cam into the back of the adaptor as I do now? Just wondering if I can find a solution where a 2" filter could be used in the scope and on a lens. I have a Canon 450d with the 18-55mm kit lens but also some old M42 lenses I have used sometimes with it.
  13. 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
  14. Slightly on a tangent here. Can a 2" filter be used on the front of a DSLR lens? With a suitable adaptor? Or is it too far from the sensor?
  15. 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.
  16. 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.
  17. Rotating the camera has no effect on the dark library. Dark frames capture random electronic thermal noise, so no need to take new ones after the camera is rotated, but they should be refreshed every 6 months or so. Flat frames ideally should be taken after every session, along with the accompanying dark flats, but unless you rotate the camera, they should be OK to use on several imaging sessions. Your calibrated lights will usually let you know if you need to take fresh flats.
  18. HI, I need to plug at least one hole in my knowledge ... and a whole lot more eventually I have a general question on DARKS. If i have a DARK library taken with a particular setup, and due to Framing an Object I rotate the camera, ? - does that invalidate my DARK library and hence have to create another. I guess the same would go for FLATS also ... any wisdom appreciated gary
  19. Thanks peter, I appreciate Orion Optics mirrors are very good, I had an ODK14” scope for a while but the U.K. skies don’t allow its potential to show.
  20. So, in simple terms, what is the actual difference between the ZWO Dual band and the Altair Tri band?
  21. 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.
  22. Great images, nice selection of kit too, covers most bases. πŸ™‚ Thanks for sharing. Mark
  23. I read that the Altair Tri band has caused halos around stars on some occasions. Is this something you have experienced? Thanks
  24. 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.
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