How much better is an Ha filter than luminance filter on IC 405? #astrophotography #space #nebula @deepskydetail

Uploaded December 2023 | Updated September 2026, 12 hours ago

In a previous long form video, I figured out how much better is the signal to noise ratio from a Bortle 4 zone compared to a Bortle 7 zone. What about narrowband filters? In this video I scientifically test the SNR of a 12nm bandpass Ha filter with a luminance filter. The results may surprise you!

Here is the link that compares Bortle 7 to Bortle 4: youtu.be/OA89ZVh-ues

I made a free SNR app that can help you know how much integration time you need. It's simple to use! Check it out here: deepskydetail.shinyapps.io/Calculate_SNR

#astronomy #astrophotography #neuralnetwork #gimp #rstudio #photography #machinelearning #free #celestron #zwo #siril

Try the sharpening tool I made (AstroSharp)! Download it from GitHub here:

github.com/deepskydetail/AstroSharp

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$Why Your Stars Arent Round (And How to Actually Fix It) Ever look at your stars and think, why dont these look like circles? In this video, I break down the most common telescope aberrations — what causes them, how to tell them apart, and how to actually fix them (or figure out when you cant). Kstars Aberration Inspector Tutorial: https://www.youtube.com/watch?v=IbbxJJS9W48&t=380s @johneevans1 0:00 – Intro: Whats actually wrong with these stars? 0:40 – Welcome / My Sharpstar 130 1:13 – Definitions (on-axis, off-axis, image circle, diffraction) 2:44 – Why stars arent round (the eye analogy) 4:07 – Spherical Aberration 7:02 – Field Curvature 9:48 – Coma 11:45 – Astigmatism 13:21 – Pinched Optics 13:59 – Honorable Mentions: Miscollimation, Tilt, Chromatic Aberration 15:14 – Three Kinds of Problems (Optical vs. Mechanical vs. Seeing) 16:09 – Why Combined Aberrations Are So Hard to Diagnose 17:01 – How to Actually Fix It (Order Matters) 22:02 – Newtonian Reflectors 22:23 – Schmidt-Cassegrains (SCT) 22:58 – Classical Cassegrains 23:11 – Ritchey-Chrétien (RC) 23:32 – Maksutov-Cassegrain 23:49 – Dall-Kirkham 24:05 – Refractors (Doublets/Triplets/Quadruplets) 24:37 – Outro and Thank You Become a buymeacoffee member to help choose which products I review: https://www.buymeacoffee.com/deepskydetail Affiliate Links: High Point Scientific: https://www.highpointscientific.com/?rfsn=8751569.cc9d94 Agena Astro: https://agenaastro.com/?rfsn=7802039.3f4caf Skywatcher HEQ5 Mount https://amzn.to/3NVrVQi Skywatcher 80mm F7.5 Doublet https://amzn.to/47mbfZi ZWO EFW mini filter wheel https://amzn.to/48OxhoN Optolong LRGB Filter Set (1.25) https://amzn.to/47r23Tw Orion 0.8x Reducer https://amzn.to/47s64a4 USB RJ45 Cable for Controlling Mount https://amzn.to/4aPlIzu Raspberry Pi to control mount https://amzn.to/48mTBWH R Pi case with touch screen https://amzn.to/3HvdNKl ZWO Autofocuser https://amzn.to/3Skg0hX ZWO 294MM Pro Camera: https://bit.ly/3tZmjOo HEQ5 Mount: https://bit.ly/3O7VQVz (mine is Orion Sirius, which is equivalent) ZWO Filter Wheel: https://bit.ly/3Soo5lw Optolong Filters (LRGB, SII, Ha, OIII): https://bit.ly/3SlEPtJ (the Ha and OIII narrowband filters are better than what I have) Skywatcher Evostar 80mm: https://bit.ly/4bfVjev (equivalent lens) USB RJ45 Cable: https://bit.ly/48FRj50 (connects mount to laptop directly; mine is a different brand, but this should do) ZWO Autofocuser: https://bit.ly/425XUDB 0.8x Reducer: https://bit.ly/3tQlbg7 (mine is Orion, but this should be equivalent) Join this channel to get access to perks: https://www.youtube.com/channel/UCoI4bUAKNI3rdvesiNqtYJw/join$