i am trying to calculate the fratio i am getting through my current setup to see how close i am. i have uploaded the image to astronomy.net and have the data but as this is the first time ive done this, i am struggling with the conversions and math. any experts out there have simple way ot example? the only online google search gave me a decent article but he is leaving out a key conversion and does not explain what calculation from the image he uses to get this number. i can remote in and give the data if needed or just point me in a direction if possible.