I will help you understand what Gain and Offset are along with comparing images taken with HDR or Unity Gain camera settings. ***UPDATE****  The author of the blog I reference Jon Minnick left a comment below clarifying the QE value.   "I just wanted to point out that the Quantum Efficiency value doesn’t really “cap” the top of the bucket or chop off how many electrons it can hold. Instead, the quantum efficiency indicates the rate that the bucket actually catches the incoming rain drops.  If there are 100 incoming raindrops, a camera with a QE of 60% will on average actually catch and count 60 of those 100 raindrops. Whereas a camera with a QE of 85% will on average catch and count 85 of those incoming 100 raindrops." Check out the articles on Cloud Break Optics, They now have 7 parts to the series!  The articles I talk about are called Pixel by Pixel, Scroll back to part 1.   cloudbreakoptics.com/blogs/news/astrophotography-pixel-by-pixel-part-1 Music by Artlist *******New Amy Astro Merchandise available here******** ******* https://www.redbubble.com/people/amyastro/shop?asc=u ***** Follow me at: Patreon: https://www.patreon.com/amyastro Website: https://www.amyastro.com Facebook: https://www.facebook.com/AmyAstroAdventures Instagram: https://www.instagram.com/amy_astro_photography/ Astrobin: https://www.astrobin.com/users/AmyAstro/ Check out the darkest skies in Georgia. Link to Deerlick Astronomy Village for more information https://deerlickgroup.com/membership-account/membership-levels/?pa=681235106C Disclaimer: Some but not all links are affiliate links and if you make a purchase through this link, I will receive a small commission for referring you to the product. Thank you so much in advance if you decide to make a purchase of an item through the links provided. Mini PC's I Use Minix https://amzn.to/2SlVuxk Bmax https://amzn.to/2GjkEdF BMax Storage Upgrade to 1T https://amzn.to/33AmsYv Raven Telescope Setup Explore Scientific 102FCD100 CF *New Upgrade* Power Box https://tinyurl.com/y2pdl7ln Telescope Explore Scientific https://amzn.to/2FTQc5Y Mount https://tinyurl.com/yxv9rm3k Main Imaging Camera -Raven Scope mono ZWO https://amzn.to/2Rji0Gh ** Mini PC ** https://amzn.to/3aAesslFilter Wheel 1.25" https://amzn.to/2RpSiQG Filter Wheel 36mm https://amzn.to/3afloui Guide Camera-Raven https://amzn.to/3abLI8F Guide Scope-Raven https://amzn.to/3a93M3j Saddle Upgrade -https://tinyurl.com/y5jz2zhy 10mm spacer https://tinyurl.com/y3tanqqr 20mm spacer https://tinyurl.com/y5lljmuq 30mm spacer https://tinyurl.com/y3eqg8xd Saddle Rosette Tool LOVE! - https://tinyurl.com/y23uhb4d Finder https://amzn.to/2xS1FT9 Astromania 60mm Guide Scope Kit https://amzn.to/3awxPB9 Power Distribution https://amzn.to/2X74dFC Wattmeter https://amzn.to/2WYE23Y Desktop Switching Power Supply https://amzn.to/2AuAxus Powerwerx 2.1mm to Power Pole https://amzn.to/3fTClxn Powerwerx 2.5mm to Power Pole https://amzn.to/2zEHNDH Powerpole to USB https://amzn.to/3fXl3zy Powerpole to cigarette lighter socket https://amzn.to/3bCzeGW #astrophotography,#astronomy,#telescope,#pixinsight,#tutorial,#landseaandsky,#altairastro,#explorescientific,#zwo,#moonlite,#orion,#losmandy,#pegasusastro,#nitecrawler,#starwave,#minipc,#rig,#telescoperig,#amyastro,#amyastrophotography,#PHD2,#Guiding,#DAV,#DeerlickGroup,#nikon,#D850,#gain,#offset,Astrophotography,#camera