Scattered Thoughts . . .

I 've been working on putting together a very small telescope for capturing the full disk of the sun in the Hydrogen alpha wavelength.  Actually, I've been working on two different solar astronomy projects.  This project should not be confused with building a spectroheliograph which is another project I am working on at the moment.  That spectroheliograph project is much more complex than this one.  I'm still waiting on the optical parts to arrive from France for that project.  In the meantime, I came up with an idea that I had written about here but it wasn't until this morning that I was able to get outside in the sun to test this new setup. When I put together this surprisingly tiny telescope (it is really a small 50mm guide scope), I wasn't sure of the spacing required to get everything to come to focus.  I wasn't even completely sure whether I would have success in capturing the full disk of the sun.  It was possible that I would still be too magnified and

T he other day, I went out to the shed in the rain to cut out a couple of aperture masks for my small 50mm guide scope.  I want to try to use this guide scope as an imaging scope for imaging the full disk of the sun.  I have previously worked out a potential configuration to do the same using my 72mm ED refractor but I want to compare the two and then continue to use the one that produces the best images.   I need these aperture masks because I need the guide scope's focal ratio to be in the f5 to f6.5 range.  Without these aperture masks, my guide scope is at f3.2 which is too fast for this particular use.  I'm using my Quark Chromosphere solar filter so I need the focal ratio to be between f4 and f8.  I'm thinking that closer to f4 might be better for capturing prominences while closer to f8 will be better for capturing details on the 'surface' of the chromosphere.  This surface isn't really a hard surface though...  it is a surface of plasma gas in the form o

I had written previously about finally finding a configuration of gear that makes full disk solar observing far more enjoyable than without this new configuration of solar gear.  The purpose of this blog entry is more about documenting this new and unusual configuration so I can duplicate it again each time I want to observe the full disk of the sun with my Quark solar filter.  Of course, I have this configuration documented in my notes too but I figured it would be good to document it here as well.   My larger telescopes provide more closeup views but I like to see the whole disk as well.  In order to improve my full disk view, I had to play around with a few ideas on how I could possibly accomplish this.  I kept going back to my assortment of astronomy components to assemble different configurations.  Then I had to play around with spacing.  It was a fairly long process of trial and error based upon the knowledge I had gained through experience but I eventually hit upon the right co

M y little project for yesterday morning was to get the spacing adjusted correctly so I can capture the complete full disk of the sun including any prominences that may be extending from the limb in Hydrogen Alpha (Ha) with my current telescope and camera.  This little project was actually a tedious process of trial and error but I succeeded as seen in the photo (at right).   In hindsight, I should have set up my new mount for this project so I didn't have to constantly spend time tracking the sun manually.  Instead, I used a lightweight manual mount that has no slow motion controls because I am still quite sick with either COVID or a bad respiratory cold.  Setting up the new mount would have required more energy than I have right now so I opted for a much smaller mount.  Unfortunately, this smaller mount made this project a bit more tedious than it needs to be.  I was constantly nudging the telescope to keep it in my field of view as the sun slowly moved across the sky.  If I used

Until recently, I've been using my usual photography-based cameras for my astrophotography.  I'm not going to get into details here but using those everyday cameras is not ideal for most astrophotography (it's okay for some things but not ideal for most) so I purchased two astronomy cameras.  One camera captures high speed video in color and the other camera captures high speed video in monochrome.  Capturing video provides me with many frames to stack as images in a very short period of time.  Stacking the images provides a lot of benefits including less noise, more details and cumulative exposure.  With these cameras and a fast computer, I can capture hundreds of video frames (which are images) in just a few short seconds.  And that is at 6mp.  Many low end astronomy cameras are less than HD resolution, one or two are at Full HD resolution and my cameras happen to capture larger images at 6mp so I'm happy with that too.     I have two Sony cameras that I use for my ev