Wesley's Tool-Box

Hoping to get a bigger look at the planets, I bought a 5mm LE series eyepiece from e.Frantis. It would supposedly get twice the magnification of the 25mm eyepiece & 2.5x barlow lens combination. After waiting for more than a week for the weather to clear up, I observed the planet Saturn through the brand new eyepiece. It certainly showed the planet nicely, in spite of being a bit dark due to the high magnification.

Not to miss the opportunity to capture this on camera, I got my SX50 HS camera out and placed it over the eyepiece by hand. After several hundred shots, I was able to recover a handful of good photos. Putting them together, I was able to finally have the Cassini Division on the rings of Saturn properly show up. This fulfilled one of the main expectations I had of the Celestron NexStar 6SE telescope.

As for the actual magnification of the eyepiece, my calculations showed that the photos had a 0.22 arc second / pixel resolution, which is about 6.65 times better than the 50x zoom provided by SX50 HS's integrated lens. This is equivalent to having a 8000mm zoom lens. Also, this is 2.4 times the magnification given by the aforementioned eyepiece-barlow lens combo. This is somewhat higher than expected.

Telescope: Celestron NexStar 6SE + 5mm eyepiece
Device: Canon SX50 HS (afocal)
Settings: 24mm - ISO 200 - 1/5s - f/3.4
Filters: None
Time: 2015-04-27 03:16-03:29 KST
Location: Naju, Korea
23 photos stacked with RegiStax 6.1.0.8

After fixing the collimator screw problem, I spent some time getting my Celestron NexStar 6SE properly collimated. To see if this improved the sights, I pointed the telescope to Jupiter. Sure enough, I could see the details of the clouds on the surface much better. I could even make out the Great Red Spot.

I wanted to capture this on camera, so I attached my Canon EOS 450D DSLR directly to the telescope tube for some prime focus astrophotography. But for reasons I still haven't figured out yet, the photos couldn't resolve any details - the planet was just a yellowish disc. I'd have to take photos of the Moon to see what's going on in the coming days.

Still, I didn't want to waste a good sighting opportunity, so I pulled out my usual astrophotography gear, SX50 HS, and took the photos of Jupiter through the eyepiece and the barlow lens attached to the Celestron NexStar 6SE without using the optical zoom. This yielded a pretty good result, especially considering that I just held the camera up the eyepiece by hand. The disc is also about 2.75 times the diameter compared to what would've been possible with the camera's integrated 50x zoom (0.53 vs. 1.46 arc seconds).

Telescope: Celestron NexStar 6SE + 25mm eyepiece + 2.5x barlow
Device: Canon SX50 HS (afocal)
Settings: 24mm - ISO 80 - 1/80s - f/3.4
Filters: None
Time: 2015-03-27 01:14 KST
Location: Naju, Korea

I've mentioned earlier that one of the collimator screws on my Celestron NexStar 6SE telescope was completely stuck, preventing proper calibration. It was so bad that the screw's head became stripped in the attempts to unscrew it, and pliers were of no use, either. To fix this problem, I ordered Anex ANH2-065, a stripped screw extraction kit made in Japan for US$20. It had a lot of favourable reviews, so I thought I might as well try it.

The kit came with two drill bits, one for working with 2.5 to 3mm screws (red) and the other, 4 to 5mm screws (yellow). One end of each bit is used for drilling a small hole in the middle of the screw and the other end is a reverse-threaded tap that gets inserted into this hole. As you turn the bit counter-clockwise, the tap burrows into the screw. Eventually, the screw is supposed to turn with it and come out.


NexStar 6SE's collimator screw is the same one used with C6, an M3 (3mm) type with 12mm length, so I got my old cordless drill charged up and inserted the red bit. I set the torque level to low to reduce the risk of damage, and carefully drilled out a tiny hole about 4mm deep into the stuck screw.

As Saturn now rises before midnight, it becomes possible to see the planet well above the horizon before it disappears into the morning sky. Seeing that the weather was getting good, I decided to wake up early and see it for myself for the first time this year. I bought a new Celestron NexStar 6SE telescope some time ago and I could use it to pick it out of the southern sky with relative ease.

Unfortunately, one of the collimator screws on the telescope is stuck, preventing full calibration. I attached my DSLR to take some photos, but it did not come out well. So instead, I made a couple of quick shots using my iPhone 6 Plus through the eyepiece, which for some reason came out looking slightly better.

Not to waste the opportunity, I then took out my SX50 HS and photographed Saturn as I've done since two years ago. The result was the best the camera has produced so far, I think.

[Left]
Device: Canon SX50 HS
Settings: 1200mm (2x enlarged) - ISO 160 - 1/30s - f/6.5
Filters: None
Time: 2015-03-23 05:35 KST
Location: Naju, Korea
20 photos stacked with RegiStax 6.1.0.8

[Right]
Telescope: Celestron NexStar 6SE + 25mm eyepiece + 2.5x barlow
Device: iPhone 6 Plus (afocal)
Settings: 29mm - ISO 125 - 1/10s - f/2.2
Filters: None
Time: 2015-03-23 06:02 KST
Location: Naju, Korea