The horrid weather continues here, either rain, thunder and high wind, cloudy nights or nights murky like a bowl of milk were the norm for the past month. Then a hurricane came my way, then veered to the west knocking out the power as it went by. Fortunately, no damage resulted. It's finally starting to cool down and last night when I was observing with the Celestron I opted not to use the dew heater and chose to use the dew cap alone. Since skies were too poor to make driving to the airstrip worth the time and effort, I set up at home and concentrated on the Moon instead.
The 60 mile wide complex crater Copernicus was well positioned for imaging, so I made an effort to get plenty of video of it. The close up view was made with the use of my 2.8X University Optics Barlow lens between the camera and telescope. The wider area image was made with the camera alone at the telescope's prime focus. Because the sensor in the camera is very small, the camera sees the same field of view that a 5mm eyepiece would show through the same telescope. That is why I am using my film camera to take whole disk photos of the moon and Sun, it would take most of the night to take videos of the whole of the moon, then I would have to mosaic together the resulting still images. The video eyepiece is great for specific features on the moon through.
I noticed this field of craters as I was scanning the face of the moon with the Celestron, and thought it would make an interesting subject. Note the crater floors are still in darkness while the rims are sunlight, evidence of their great height above the surrounding plain.
The craters Messier and Messier-A were made by a pair of asteroids hitting the surface at the same time. Because they came in at a very shallow angle relative to the surface, they hurled jets of pulverized lunar rock ahead of them, forming the twin streaks extending from the craters. This feature is obvious even near full moon with a small telescope.
The ancient lunar highlands crater Ptolameus dominates the frame in this photo. Note the completely flat crater floor, other than the small impact crater in it, it's completely filled with hardened lava that welled up from below between three and four billion years ago. The crater to the left is Alphonsus, which is where the Ranger 9 lunar probe slammed into the moon at the end of its mission to take close up pictures of the moon. It's impact at 8,800 feet per second or nearly 6,000 mph excavated a crater over 40 feet across that was spotted by the Lunar Reconnaissance Orbiter. Right up to the moment it was destroyed on impact, it relayed ever sharper pictures of what was then a completely unknown lunar surface.
I re-imaged the Archimedes crater region and got better video than the last time. With that Registax yielded a much better image. I find that processing video and extracting a still image is tedious work, requiring a great deal of experimentation with the wavelet functions to get a good view. The effort however can and does pay off in amazing high resolution close ups of the Moon and planets. It is somewhere in this area the Luna 2 spacecraft crashed into the moon back in 1959.
This picture of the 2-day old moon was taken on Fujicolor 200 print film at prime focus with my Nikon F-3 and an exposure time of 1/15th of a second. Despite the low elevation, the moon displays great detail along the terminator.
A week later I imaged the moon again with the same camera and film after using the video eyepiece to take close ups. Here I used a shutter speed of 1/125th of a second.
Four days after that I imaged the 13-day old moon with the same camera and film, but I used a shutter speed of 1/250th of a second. I recently found a good cable release so use of the self timer was no longer needed. I did however use the mirror lock-up as before. After taking delivery of the 3X TeleVue Barlow, I plan to acquire a flip mirror to make finding and centering objects in the camera's tiny field of view easier, as well as a 2X TeleVue Barlow lens. It will be used for the times when less magnification is needed, but more than what I would get if I used the camera at prime focus. Then it will be time to get a better camera. The current camera has neither very good resolution or dynamic range. It is little more than a web camera repurposed into a video eyepiece.