Greetings, Everyone.
I'm brand new here and just beginning my adventures into solar imaging for myself (I was part of someone else's project for the solar eclipse back in August).
My goal is to get whole-disk images of the Sun and Moon, respectively. I know that comes either from making a composite image or from having the right camera for your telescope. Eventually I will be able to justify a new CCD, but right now I am trying to learn with my Orion StarShoot webcam and an old Meade DSI. How can you determine whether or not the entire Sun will fit in an image? I found a few equations which I thought would help me get there, but the sun still did not quite fit when I tried the cameras out on a few borrowed telescopes which I thought would have worked.
I appreciate and help and guidance I can get!
Zack
Getting a full disk image
- robert
- Way More Fun to Share It!!
- Posts: 3072
- Joined: Fri Oct 14, 2011 1:49 pm
- Location: N.W.Scotland
- Has thanked: 4 times
- Been thanked: 1286 times
- Contact:
Re: Getting a full disk image
You could use this field of view calculator
http://m.skyatnightmagazine.com/astrono ... calculator
Focal reducers can be used to shrink the disk and are not expensive too.
Robert
http://m.skyatnightmagazine.com/astrono ... calculator
Focal reducers can be used to shrink the disk and are not expensive too.
Robert
images and animations http://tinyurl.com/h5bgoso
2024 images https://www.flickr.com/photos/69734017@ ... 0313830045
2023 images https://www.flickr.com/photos/69734017@ ... 0304905278
ED80. ED100. Celestron-150mm-PST mod. C8 edge. ES127
LS60PT-LS60F-B1200. B600-Cak. PGR-Ch3-IMX265
2024 images https://www.flickr.com/photos/69734017@ ... 0313830045
2023 images https://www.flickr.com/photos/69734017@ ... 0304905278
ED80. ED100. Celestron-150mm-PST mod. C8 edge. ES127
LS60PT-LS60F-B1200. B600-Cak. PGR-Ch3-IMX265
- robert
- Way More Fun to Share It!!
- Posts: 3072
- Joined: Fri Oct 14, 2011 1:49 pm
- Location: N.W.Scotland
- Has thanked: 4 times
- Been thanked: 1286 times
- Contact:
Re: Getting a full disk image
images and animations http://tinyurl.com/h5bgoso
2024 images https://www.flickr.com/photos/69734017@ ... 0313830045
2023 images https://www.flickr.com/photos/69734017@ ... 0304905278
ED80. ED100. Celestron-150mm-PST mod. C8 edge. ES127
LS60PT-LS60F-B1200. B600-Cak. PGR-Ch3-IMX265
2024 images https://www.flickr.com/photos/69734017@ ... 0313830045
2023 images https://www.flickr.com/photos/69734017@ ... 0304905278
ED80. ED100. Celestron-150mm-PST mod. C8 edge. ES127
LS60PT-LS60F-B1200. B600-Cak. PGR-Ch3-IMX265
- Bob Yoesle
- Almost There...
- Posts: 997
- Joined: Thu Mar 08, 2012 7:24 pm
- Has thanked: 543 times
- Been thanked: 812 times
Re: Getting a full disk image
Multiply the focal length by 0.0092 to get the average solar disc diameter at focus.
Example 1000 mm FL x 0.0092 = 9.2 mm image diameter.
You'll have to add a bit to this to allow for capturing prominences around the disc periphery.
As you can see this would require quite a large and expensive camera sensor. Using a smaller chip with very small pixels and a shorter focal length would be a good idea, or using mosaics to build up a full disc image.
Example 1000 mm FL x 0.0092 = 9.2 mm image diameter.
You'll have to add a bit to this to allow for capturing prominences around the disc periphery.
As you can see this would require quite a large and expensive camera sensor. Using a smaller chip with very small pixels and a shorter focal length would be a good idea, or using mosaics to build up a full disc image.
Diagonally parked in a parallel universe.
Curiosity is the father of knowledge; uncertainty is the mother of wisdom.
Dark-Sky Defenders
Goldendale Observatory
Curiosity is the father of knowledge; uncertainty is the mother of wisdom.
Dark-Sky Defenders
Goldendale Observatory
-
- The Sun?
- Posts: 4
- Joined: Tue Dec 05, 2017 4:37 am
Re: Getting a full disk image
Perfect, that's exactly the type of help I was hoping for. I'll re-run my calculations and look up the specs on my DSI again. I know I'll eventually probably end up getting a refractor that is not an h-alpha. Now I'll be able ot make sure I get one with the appropriate focal length. Thanks!
Zack
Zack