This one was difficult to bring out the nebula since the UHC-S filter blocks some of the blue that this object predominantly shines in. But, it captures enough of the OIII, Hydrogen Alpha and Beta light to produce an image even from the heavily light-polluted location that I’ve been imaging from.
A quick process job of 67 frames that I did in the middle of shooting the Rosette Nebula. I have 121 frames total, but have not gotten a chance to process that file, yet. So, this is an interim version that will be superceded, eventually.
3 hours of exposure for this object. I used SharpCap 3.2 LiveStacking and a Baader UHC-S filter to cut through the light pollution in a Bortle 8 Red Zone metro area.
M51 on Jan 25, 2020. 280 x 30 sec, Gain 42, Offset 15, -20C, UHC-S filter, QHY183c, TV-85 at F/5.6.
Finally, the weather cleared after several weeks of clouds. This is typical for December down here in Cajun Country. With the clear conditions, I got a chance to try out a new UHC-S filter I purchased from Baader Planetarium. It replaces the cheap generic UHC filter I got from Amazon. Still shooting from the big city these days in Bortle 8 Red zone is a good test of these filters to see how much LP gets in and how well galaxies and nebulae show up.
I found out the L-eNhance filter doesn’t do much for galaxies unless they have lots of H-alpha regions. An hour worth of subs I took at the beginning of the month of the Leo Trio barely had anything worth keeping, so I only blended about 25% of it in to this image. The 450×30 sec Live Stack with dithering turned on I acquired in SharpCap 3.2 and the UHC-S filter was good enough to stand on its own.
Minimal post processing was done for this one, which is always nice after staying up all night imaging. lol 🙂
Before I shot the Leo Trio, I did a “blue test” on the Pleiades. I have 16 minutes worth of data and it shows how well this filter does with broad band and non-h-alpha objects. Check it out: