Scattered Thoughts . . .

All the parts for the spectroheliograph I am making have arrived from France over the past couple of weeks.  Today is a day of thunderstorms so I decided to start assembling this instrument. The last parts to arrive were the optical parts...  two doublet lens assemblies, a tiny slit, and a holographic grating.  I needed to disassemble the 3D printed parts so I could assemble the entire instrument with the optical parts included.  Of course, I first cleaned up the room and removed as much dust as possible. Once I assembled everything, it was time to connect it to a computer so I could make some tedious fine adjustments and then test everything. The first obstacle to overcome was that the holographic grating was not in line with the rest of the assembly.  I needed to shim this significantly and it is still not right.  I might need to re-shim this part after more testing.   Unfortunately, it is quite dark outside today with dark clouds changing the l...

Sony a6000 camera So, after writing about my "first light" experience last night, I realized that I haven't really written anything about this telescope or even the camera I used. Let me start by saying that both of these pieces of equipment are considered "entry-level"... the telescope is an entry-level telescope for just getting started in astrophotography... and the camera is an entry-level, all purpose mirrorless interchangeable lens camera.  Let's start with the camera since that is what actually captures the imaging. It is a Sony a6000 camera body... quite small and almost pocketable... but works great for action photos of the grandchildren as well as wildlife photography. This is also the camera I bring to the hospital because its shutter is quieter than my better camera and because it is a bit smaller than my better camera. This is an old camera by digital standards but it far surpasses entry level cameras produced today by all other manufact...

It is always a memorable event when you set up a new telescope outside and peer through the eyepiece to see the first light coming through the scope... tonight was one such night for me! When we arrived back home from the hospital tonight after another visit to Miss Ellie in the PICU, I immediately started setting up my new telescope in our driveway. Well... truth be told, it is about a month old now but I hadn't had a chance to observe the night sky before tonight. Tonight would be first light through this telescope.  Setup required about eight trips in and out of the house. I need to find a way to consolidate all the little odds and ends to make this task a bit easier and faster. Then I had to set up the scope... level it... align it with Polaris... then do an additional alignment on one to three additional stars. This went fairly well but I plan to do a bit more practicing on this because my alignment was off a little bit. Plus, I couldn't figure out how to slew using th...