Monday, September 11, 2017

20170911 Sun

I was reading books on my holiday but then I suddenly realized that I didn't do solar imaging for quite some time, so why not?


0714 (UT), taken with my Ranger, Solarmax 60/BF10 plus a small reducer lens dropped into the barrel of the BF10 as usual. 

ASI 120mm with my new N4200 laptop featuring a 128G SSD, my Teclast formally retired after the death of its bluetooth module, I could no longer use a mouse now, and that makes Sharpcap very hard to use.

Monday, August 28, 2017

20170808 Partial lunar eclipse

I am cleaning up my hard driver to the cloud, and so I posted them here first.

I didn't go out for observing, I slept as usual but with an alarm clock set.  I woke up, didn't open the glass window and shoot through hand held with my Canon 100-400mm.  So, just a record.

First one is a short brief moment when the cloud cleared up:


And the second one which was the usual condition of that night.


Finally, an overexposed shot in the hope to light up the dark side.


And then go to sleep again.

Tuesday, August 22, 2017

20170821 Sun

Didn't play H-alpha solar imaging for quite a long time.  A typhoon is coming and the air is extremely dirty, cloud were floating around and thus the imaging window is short, I couldn't even take a full 900 frames AVI.

Just a record:


0710 (UT), at the center is AR2671.

Taken with my Ranger, Solarmax 60 with BF10, ASI 120mm with a reducer lens in the BF10.

After this imaging session, I've removed the encoder assembly from my JMI DRO focuser, it's just too bulky and I don't need to DRO for solar imaging at all.  Anyone interested in that assembly with the hand controller can contact me.


Wednesday, July 05, 2017

20170704 Jupiter

Very poor seeing after a small thunderstorm, so just to test the new motorized  focusing solution.






1247 (UT), C5 with 2x barlows... the direction of the wind could be seen easily.

My Teclast has its bluetooth dead, I have to use another notebook for image capturing.

I've tried to use a USB hub (powered) to add a bluetooth dongle plus the ASI, but then it won't have enough power to drive... I guess the powered hub is not really powered.

C5 motorized focusing

The Nexstar mount is not something very solid, and on focusing, the image will shake.  Motorized focusing is a good solution.

I believe a few pictures are better than words, basically, this is a N20 type DC geared motor, plus pulley and belt.





Here is a short video to show the end result, also to demonstrate the backlash of the system.


I will probably add a pulley on the focuser shaft to provide a better coupling.

Sunday, June 11, 2017

20170610 Jupiter

Transparency 7/10, seeing 4/10.

C5 with 2x barlows, ASI 120mm


1412 UT, I've aligned by Rigel with the C5, hopefully will make future alignment faster.

Still wonder if I shall keep a C5, or go for a smaller refractor?  I don't know indeed.

Tuesday, June 06, 2017

20170606 Home@Walnut Jupiter

Cloud come and go, it's just crazy to do imaging like this:






I waited for so long just to align the mount with Jupiter.

I waited for another cloud gap for *brief* collimation.

And then I waited very long to capture a prime focus one, taken at 1401 UT:-


And then I realized the cloud amount was reduced, so I wait to capture with a 2x barlows, taken at 1410 UT, no more detail could be shown:


Moving cloud could imply poor seeing.


It's far more comfortable to shoot indoor!

Thursday, June 01, 2017

A new project: resuming Home@Walnut observation

It's raining today, and thus it's probably the end of the three consecutive clear nights.

Last night I setup my Nexstar + C5 in the old location where I observe indoor, and it's workable.  So, I should begin the migration, i.e. to move all my gears there.  I shall move one of the plants to my office, and then the rest of the plants will be placed on top of the dry box.

Another project is the motorize the focuser of my C5.  Previously I was thinking to sell it, and replaced it with my modified FD 300mm 2.8, but then it's no good at high magnification and so I will keep my C5 and further enhance it.

Tentatively, I will use one of those small motors, add brass gear on the focuser, and then drive it like the Sky Adventurer.  Let's see.