Originally posted by Rick_B geo444, I like both
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Thanks Rick ! Here is M-17
Omega Nebula
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Messier-17 Omega Nebula in
1824 × 1280 pixel, taken through a Hazy Sky :
https://en.astronomike.net/1240578.jpg?20200309
... 2nd sub guiding failed !
Omega Nebula with its Datas here :
M-17 - Pentax K-5 iso 80 = 4 x 12 min - Pollution Lumin. Maxi :
M17 - Pentax K-5 iso 80 = 4 x12 min - Pollut° Lumi Max - Nebulae - Astronomy AstronoMike.net
That was shot through a Sky-Glow Neodymium Filter, not efficient enough !
Next time, I'll try the UHCs Filter, more able to extract the Nebula from Light Pollution...
dpreview/galleries/7467909648/photos/3227971/rosette-pentax-k5
... and increase Exposure duration up to 15~16 minutes...
Price to pay with an UHC Filter is that it's Very Difficult to use
Even after 17 min. Long Exposure, you can't see anything but Bright Stars :
https://www.cloudynights.com/gallery/sizes/32054-pk5lv-5-6/large/
- Pentax K-5 UHCs - ISO-80 = 1007 sec.(17 min.) F/4,7
M-51 is Way Brighter than M-17 in Blues-Greens !
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Last edited by geo444; 11-04-2020 at 10:52 AM.