Two things really surprised me last night while I am spending the weekend up here on Mintaka Hill watching the observatory build. A while back I purchased a used Tak FS102 refractor basically for visual use up here in the dark sky. The Tak FS is a fluorite doublet, since discontinued by Takahashi in favor of the TOA and TSA triplet optics mainly for the supposed imaging advantage, the perfect color correction. Anyway the older Taks have a superb reputation and I can’t tell you how amazing the views are through this thing. However, as an imager by nature, I just had to see what the images were like. Now I am used to big optics with self guiding dedicated ccd cameras. This is completely new to me, which is just one of the things so great about this hobby in that you can discover new things all the time…even if it’s not dark matter! I had also acquired in the past a Celestron AVX equatorial mount also for the purpose of goto visual observing. But wait a minute! There is a “guide port” on the mount. So now we have a scope and a mount that can guide. I looked into this at length and of course there is a “Celestron VX” Yahoo group. It turns out that yes you can guide! And you don’t even need to connect the mount to your computer to do it! So next thing was to figure out what to use. This set up was not going to hold much weight so next thing I needed was a guide scope and a lightweight guider. I decided to go with a lodestar guide camera and a small 50mm scope compatible with my set up (shown below). With my Canon 60D which can easily reach focus on the longer FL Tak and a freeware guiding program called “PHD” I was able to test the new platform! I was blown away by how accurate the guiding was for only rough polar alignment. I’m still learning how to fine tune that on this mount. Perhaps more on that in another post. Anyway you be the judge. The stars are not perfect. They may not even be in the best focus since I had to do that on the fly. But I think you can agree that this is going to be a worthwhile activity going forward! So the 2 things I learned that surprised me:
- The Tak FS102 CAN take very good images. Also the field is pretty flat.
- You can guide accurately with the Celestron AVX with no planetarium program and no direct connection from the mount to the PC!
Portable visual/ imaging set up. Tak FS 102 on a Celestron AVX. 50mm guidescope is mounted on the Tak as you can see. How guiding works: Connect your dslr as you would normally to your computer. Attach the guide camera to the guidescope. You should have 2 cables with your guide camera. One cable is an ethernet like cable that connects directly to the guide port on the mount. The other is a usb cable that connects to your computer. Download the freeware program “PHD guiding” and follow the instructions. When asked to select your guiding configuration, choose “on-camera” which means the camera is connected to the mount. That’s totally it!
This is a completely raw unprocessed image of our good friend in the Milky Way, the Lagoon Nebula. 4 minute exposure using the set up described above. This was with very rough polar alignment. I was within about 20-25 arc minutes of the pole in both altitude and azimuth!
The BYO (Backyard Observatories) crew finally arrives and construction starts on Orion’s Belt Observatory! Completion of the structure is expected in a week. Day 1 went fine. No disasters. The foundation was a little off level to the north and west so they had to put shims but otherwise no issues.
The crew finally arrives! Construction begins. View to the West
Completion of subflooring and connecting the conduit from the piers to the electrical panel and warm room
Flooring is done. It appears to be pretty level with the piers. One data conduit per pier enters the warm room
Day one is in the books with floor done and 2 walls
A successful day 1! View to the north from Alnitak Trail
Probably everyone who visits a dark sky site with any regularity has the urge to take “that shot” of the southern Milky Way. With spectacular weather up here for the 4th that’s exactly what I did at about 1 AM when the Milky Way was just past meridian. So while I don’t have the observatory up and running yet, we have a large deck where I can set up a camera and tripod, and with the aid of the Polarie Star Tracker (Vixen Optics) I took 24 frames each 3 minutes long. The Polarie device is basically a small synchronous motor, battery powered with 2 AA batteries, that you can screw your camera onto and it will allow time exposures of the sky. There is a small site hole in the body of it to site on Polaris. The tracking is decent. I used a Canon 60D modified with a 10-18mm zoom set at 10.
Southern Milky Way from Mayhill NM. Single raw image 3 minutes. Canon 60D, 10-18mm lens set at 10, 1600 ISO, Polarie Star Tracker. About 1 AM Mountain Daylight Time