query on OrionPosted By John Harris |
Joe,
I think another issue here may be the smallish field of view your 8mm eyepiece is giving you.
I now see the focal length of your 10" dob is 44" or 1118mm, so the 8mm eyepiece is giving you 140x magnification. I'm purely guessing that your eyepiece may have an apparent field of view around 50 degrees. OK, if so, that means the true field of view you're seeing is about 1/3 of a degree.
You may get a better view of the nebula by using an eyepiece that gives a larger true field of view. I see in an earlier post you have a 12mm eyepiece, try that one it may work better. If you have a chance to find an eyepiece of 20 to 26mm, that would give more like one full degree.
Just a suggestion. Best of luck!
I think another issue here may be the smallish field of view your 8mm eyepiece is giving you.
I now see the focal length of your 10" dob is 44" or 1118mm, so the 8mm eyepiece is giving you 140x magnification. I'm purely guessing that your eyepiece may have an apparent field of view around 50 degrees. OK, if so, that means the true field of view you're seeing is about 1/3 of a degree.
You may get a better view of the nebula by using an eyepiece that gives a larger true field of view. I see in an earlier post you have a 12mm eyepiece, try that one it may work better. If you have a chance to find an eyepiece of 20 to 26mm, that would give more like one full degree.
Just a suggestion. Best of luck!
